ISSN:0035-919X    

DOI:10.1080/00359195409518975

出版商:Taylor & Francis Group    

年代:1954

数据来源: Taylor

摘要:

Cape Hangklip consists of the abrasion platform of the 60 Foot Sea, partially regraded at the 20–25 Foot Stage and at the 12–14 Foot Sub-stage of the succeeding regression. A basal shingle may be evidence of this marine withdrawal.

ISSN:0035-919X    

DOI:10.1080/00359195409518976

出版商:Taylor & Francis Group    

年代:1954

数据来源: Taylor

摘要:

The current flowing between two unattackable electrodes under the influence of a P.D. less than the decomposition voltage of the electrolyte has been investigated and found to be extremely complex.

ISSN:0035-919X    

DOI:10.1080/00359195409518977

出版商:Taylor & Francis Group    

年代:1954

数据来源: Taylor

摘要:

The distinctive characteristics of every genus and species belonging to, or related to, the family, Whaitsiidae, are described. Special attention is given to interrelationship. Ten genera and twenty species are described or discussed, including one new genus and five new species. Attempts are made to illustrate their relationship in the form of a genealogical tree and the genera are discussed in the orderPromoschorhynchus, Moschorhynchus, WhaitsiaandNotosollasia, starting with the primitive new genus and proceeding in the order of specialization. The relationship of the genusMoschorhinusis then discussed and thereafter the incompletely known generaAlopecopsis, Notaelurops, Aneugomphius, TheriognathusandHyenosaurus.The new species described arePromoschorhynchus plalyrhinus, Moschorhynchus brachyrhinusandM. gracilis, Notosollasia boonstraiandN. longiceps.

ISSN:0035-919X    

DOI:10.1080/00359195409518978

出版商:Taylor & Francis Group    

年代:1954

数据来源: Taylor

摘要:

The level ground or isthmus at approximately 200 ft. (61 m.) above sea-level at Cape Maclear is not regarded as a wave-cut platform it its present form, neither are the sandstone ledges and rounded pebbles on the slopes to the north considered to be raised marine benches and beaches. The isthmus, which coincides with a synclinal axis in the Table Mountain Series, was cuestiform until built up by blown sand from the north-west. On the Palaeolithic site to the north this sand invasion occurred during the Middle Stone Age. The cliffs in the west date from the Minor Emergence of Krige (1927) and the rock ledges and caves at Cape Maclear and Cape Point denote a pause at between 12 and 14 ft. (4 m.) in the subsequent withdrawal. The dune invasion which followed suggests that the regression continued below present sea-level, so indicating an interglacial age for the Minor Emergence and the succeeding sub-stage. A shingle beach which marks the limit of the succeeding recovery of sea-level may embrace a small post-glacial regression.

ISSN:0035-919X    

DOI:10.1080/00359195409518979

出版商:Taylor & Francis Group    

年代:1954

数据来源: Taylor

摘要:

Preliminary investigations of the life history of seven species of sessile cirripede found round the Cape Peninsula, South Africa, have been made. The species studied areBalanus algicolaPilsbry,B. trigonusDarwin,B. maxillarisGron.,B. amphitriteDarwin var.denticulataBroch,Octomeris angulosaSow.,Tetraclita serrataDarwin andChthamalus dentatusKrauss.

ISSN:0035-919X    

DOI:10.1080/00359195409518980

出版商:Taylor & Francis Group    

年代:1954

数据来源: Taylor

摘要:

This paper* deals with a new type of green alga originally found on the Cape Flats and since obtained in the United States of America and Australia. Initially identified as a second species ofVolvulinaPlayfair, the considerations which led to the establishment of a distinct genus,Astrephomene, including the appearance from the Flats ofVolvulinaitself, are summarized, Playfair's description analysed and the resultant conclusion that he was dealing with two different algae mentioned; the steps that resulted in the verification of this conclusion are indicated. The two methods of culture used in the investigation are described.

ISSN:0035-919X    

DOI:10.1080/00359195409518981

出版商:Taylor & Francis Group    

年代:1954

数据来源: Taylor

摘要:

St. Lucia Estuary on the Zululand coast, which once had a rich fauna of prawns and fish, has recently deteriorated. An ecological survey has shown that this is due to silting at the mouth and very saline water in the upper lakes. These conditions are traced back to droughts, erosion and man's interference with the filtering action of swamps. The present fauna and flora are described and plans for improving the estuary are discussed.

ISSN:0035-919X    

DOI:10.1080/00359195409518982

出版商:Taylor & Francis Group    

年代:1954

数据来源: Taylor

摘要:

The topography of Richard's Bay Estuary is described, and an account given of the physical and chemical factors. The estuary is tidal in the channel area, and saline water is present in the Umhlatuzi Lake. There is a normal salinity gradient ranging from 0·3%0in the rivers to 35·8%0in the mouth. On the basis of these factors the estuary is divided into four regions, namely the Rivers, the Umhlatuzi Lake, the Channel and the Mouth, and the fauna and vegetation of each are described. A total of 183 species was found and is listed in the appendix. It is concluded that Richard's Bay is an example of a normal sub-tropical estuary which has been little influenced by man. The faunistic divisions are discussed and are compared with those of Knysna Estuary on the south coast, and those postulated by Day (1951) for an ideal estuary.

ISSN:0035-919X    

DOI:10.1080/00359195409518983

出版商:Taylor & Francis Group    

年代:1954

数据来源: Taylor

摘要:

The euphausiid crustaceans from several extensive collections made in the waters around southern Africa have been examined. Forty-two species, belonging to nine genera, are described and fully illustrated. One new species,Thysanopoda subaequalis, is described, and sixteen new distribution records are added. Keys to the genera and species are included. A short comment is made on the hydrographic conditions in the area. The distribution of species is treated briefly, with extra emphasis on those species whose more southern representatives have been investigated by other workers.

ISSN:0035-919X    

DOI:10.1080/00359195409518984

出版商:Taylor & Francis Group    

年代:1954

数据来源: Taylor