摘要:

Little is known of South African sponges. Large collections with notes on habitats have recently been made by the University of Cape Town Ecological Survey under the direction of Professor J. H. Day. This paper, which is the first of a series, deals with 75 species of Demospongia Poecilosclerida of which 38 are new. The description of other groups will be followed by a general discussion of the distribution of these sessile animals.

ISSN:0035-919X    

DOI:10.1080/00359196309519054

出版商:Taylor & Francis Group    

年代:1963

数据来源: Taylor

摘要:

A new species ofDiscitocerasis described from the Karroo beds of Natal thus demonstrating that some of these beds if not actually marine are certainly estuarine or deltaic.

ISSN:0035-919X    

DOI:10.1080/00359196309519055

出版商:Taylor & Francis Group    

年代:1963

数据来源: Taylor

摘要:

Irregular fluctuations superimposed on the normal secular variation of the geomagnetic elements and related to solar activity, are discussed on a qualitative basis. Since a field survey may extend over a considerable period of time these fluctuations may affect the computed values of secular variation differently at the various stations. It is therefore advisable to reduce all the observations taken during a particular field survey, as well as the corresponding values at the control observatory, to a common epoch. It is suggested that smoothed curves of the observatory minus field station differences be used for this purpose.

ISSN:0035-919X    

DOI:10.1080/00359196309519056

出版商:Taylor & Francis Group    

年代:1963

数据来源: Taylor