摘要:

SUMMARY.1 An account is given of the external and internal anatomy of a new species of the aberrant Copepod genus,Ophioica, occurring within the Ophiuroid,Ophiacantha imago(Lyman).2 Specimens of ovigerous and non‐ovigerous females, with their attached males, were examined.3 The body of the adult female is unsegmented and possesses several pairs of serpentine processes. Three such pairs are present in the non‐ovigerous female and four pairs in the ovigerous female. There are also processes which arise dorso‐laterally. The abdomen is distinct only in the ovigerous female.4 The internal organs of the female are gut and reproductive organs. The former can be divided into fore‐and mid‐gut, the latter much branched. If a hind‐gut is present it cannot be differentiated from the mid‐gut. In the ovigerous female the ovaries are paired and the genital openings are probably at the tip of the abdomen.5 The male is attached to the ventral side of the female, but only the male attached to the non‐ovigerous female was fully developed. It is also unsegmented, with a tapering abdomen and a pair of serpentine lateral processes. The internal organs are again gut and reproductive organs only and the genital openings appear to be at the tip of the abdomen. In the male attached to the ovigerous female the internal organs had practically disappeared.6 It was not possible to determine the process of transference of the spermatophores from the male to the female. It is probable that the genital openings are only perforated at maturity in both sexes.7 The ovigerous female carried eight egg‐masses, pressed under the ventral surface of the body and enclosed within a ‘brood‐pouch’ of host‐tissue.8 Certain points in the biology of these parasites, consequent upon their enclosure within

ISSN:0368-2935    

DOI:10.1111/j.1096-3642.1940.tb02370.x

出版商:Blackwell Publishing Ltd    

年代:1940

数据来源: WILEY

ISSN:0368-2935    

DOI:10.1111/j.1096-3642.1940.tb02371.x

出版商:Blackwell Publishing Ltd    

年代:1940

数据来源: WILEY

摘要:

SUMMARY.1 In the remarkably unvarying tropical climate of the northern New Hebrides (Pacific Ocean), the Passerine birdPachycephala pectoralisis as seasonal in its reproduction as are the birds of temperate climates.2 In the breeding‐season the mean weight of the testes of adults rises to over forty times as much as in the non‐breeding season.3 The growth of the testes and the start of the egg‐season occur while the days are shortening.4 There is no seasonal change in diet.5 Moulting takes place after the end of the egg‐season.6 The environmental change controlling the breeding‐season is not known.7 The egg‐season ofPachycephala, spp. in the tropics of Australia comes at quite a different season of the year from that of P.pectoralisin approximately the same lat

ISSN:0368-2935    

DOI:10.1111/j.1096-3642.1940.tb02372.x

出版商:Blackwell Publishing Ltd    

年代:1940

数据来源: WILEY

ISSN:0368-2935    

DOI:10.1111/j.1096-3642.1940.tb02372a.x

出版商:Blackwell Publishing Ltd    

年代:1940

数据来源: WILEY