7.'5'2 ^ROl^ g. o. s.\rs ux [^T:iy3 



i). Z(n)l()oieai IJcsiills oF the Third T;in;;";inyika l'].\'[)(Hliiion, 

 conducted by Dr. AV. A. ( "uiinington, F.Z.S., 1*.)04- 

 1905.— "Rojiorf on ihc OstracodM. }^y Prof. G. 0. Sars, 

 C.M.Z.S. 



[Received Febrnary 21, lfHO.] 

 (Plates LXIV.-LXXIII.*) 



Inii'oductio7i. 



In a paper published in the Society's ' Proceedings' (1909, p. 31), 

 I liave given an account of the Copej)oda found in the samples 

 taken l>y Di-. Cunnington, during the Third Tanganyika Expedi- 

 tion, from the three hu-ge Ojntral African lakes, and I mentioned in 

 tills paper that a number of Ostracoila also occurred in the samples, 

 some of the species ha,ving already been observed by Dr. Cun- 

 nington, and separated by him in small tubes. I have now 

 examined the material more closel}', and give in the present paper 

 an .account of the species accompanied by carefully drawn figures 

 of all of them. The number of species determined amounts to 

 no less than 29 in all, belonging to 7 different genera. Only two 

 of these species I have been enabled to identify with previously 

 described forms ; all the others seem to be new to science. In 

 the following pages I give short descriptioUvS of all the species, 

 with remarks on affinity and occurrence, and at the close of the 

 paper some general remarks are added. 



Description of the Sjyecies. 

 Family C Y p E i B ^. 



Generic Characters. — Shell compressed, of various form in the 

 different species, in some cases appi-oaching that in Cj/pria, in 

 other cases xevy difi'erent, being, as a rule, very thin and pellucid, 

 so as to allow the enclosed animal to be rather distinctly traced 

 through its walls. Valves more or less unequal, the right one 

 being the smaller and in some cases conspicuously overlapped 

 by the left both in front and behind. Surface of shell more 

 generally smooth and only very sparingly hairy at each extremity. 

 Lind)s on the whole built upon the same type as in Cypria (see 

 the detail-figures given on PI. LXV. of one of the species). 

 ( Jaudal rami comparatively short and more or less curved, tapering 

 distally, dorsal iiA^^i^ smooth ; terminal claws of moderate size ; 

 dorsal seta generally well devel{)[)L'(l, apical seta very small. 

 Iiifeiior antennae of male with the tiiird joint distinctly sub- 

 divided. Copulatory appendages each terminating in a beak-like 

 extremity consisting of two jaws, one of which is mobile. 



* For cxplmiiitioii of tin- Plates e^o p. 757. 



