7r)2 pj:o['. c;. o. saus ox i^^'^}' -^ 



Camlal rmiii (H;^•. 11) latliLT iiaiiow. iicaily stiai^lit. and slightly 

 tapering Histally, doisal edge perfec;tly smooth ; apical claws of 

 moderate size and somewliat inieciual, the distal one the longer and 

 abont etjualling in lengtli half the ramus; dorsal seta sliorter tlian 

 the proximal claw and attached at only a short distance from it, 

 aj)iciil seta very small. 



Length of shell 0'86 mm., height 0-48 mm., widtli 0-3() mm. 



Ji'i'marks. — In the shape of the shell, as seen laterally, this 

 foini looks rather like the African species described l)y Dr. Vjivra 

 .•IS C'j/jirinotKs fossidaiKS. It is, however-, of smaller size and far 

 less tumid, exhibiting, moreover, no trace of the impi'essed dots 

 Avith which the surface of the shell in that species is sculptured, 

 nor liave I been enabled to detect any tubercles on the edges of 

 the valves. In so far this form differs materially fi-om any of the 

 other known species. In the structure of the several appendages, 

 however, as far as these could be examined in the solitary 

 specimen found, no es.-vential differences could be ti-aced. 



Occarrencp.. — A solitary female specimen of this form was found 

 in a sample from Victoria Nyanza (250), taken 20/4/05 at Hukuba 

 (W. shore of lake). 



(lenus (). Ilyoc'YIMUS Brady. 



JiPiiHirks. — Several noi-thern s})ecies of this distinct genus have 

 been <lescribed, and also an Australian species, /. anstrulia G. O. 

 Sars. In the Ostracod material from the Tanganyika Expedition 

 two species of this genus are represented, though only by solit.-iiy 

 specimens. 1 liave been miable to identify either of ihcm with 

 previously' descril)ed species. 



27. Ilyocypuis propixqia, sp. n. (Plate LXXlil. ligs. 1-4.) 



Specific Characters. — Femalk. .Shell moderately compressed ; 

 .seen laterally (fig. 1) of oval renifoi-m shape, greatest height 

 occurring far in front and slightly exceeding half the length, 

 anteiior extremity broadly rounded, posterior narrower and 

 obtuselv truncated ; dorsal margin nearly strjiight and oblicpiely 

 sloping behind, forming with the posterior m;u-gin an obtuse 

 anyle, ventral maigin deeply sinuated in the middle : seen doi-.sally 

 (fig. 2) oblong-ovate in form, projecting on each side behind tlu> 

 middle to an obtuse protuberance, another smaller rouiided promi- 

 nence occurring on each side in front of the middle. Valves only 

 slightly pellucid and somewhat unequal, the right overla])ping tlie 

 left in front by a narrow hyaline lim, and also somewhat along 

 the ]iosterior part of the ventral face. Surface of shell sculptured 

 with densely crowded impre.sseil dots and provided with .scattered 

 stifi" hairs, more conspicuous at each extremity. Muscular im- 

 pressions in the centre of each valve (fig. H) deiK-ely crowded and 

 sonu-what difiering in nundier and arrangement from those intlie 

 oilier genera. (".ludiil rami (fig. 4) r;ither n;in-ow iind cou- 

 spi<Mionsly c'.U'N (il, dorsid cilgc sinoolh ; apical rlaws i-at her slt'uder 



