1910.] OSTRACOBA FROM TAXOANYIKA. 743 



claws strong and paitly denticulate inside ; natatory setie 

 issuing at some distance from the end of the second joint antl 

 extending about as far as the claws. Mandibular palp 

 (fig. 6) comparatively smaller than in raracy]^ria, with the last 

 joint short and thick. Palp and masticatory lobes of anterior 

 maxillcfi (lig. 7) slender and narrow. Anterior legs (fig. 8) com- 

 paratively large, with the dactylus strong and evenly curved. 

 Posterior legs (fig. 9) much smaller, and having the refiexed 

 apical seta quite short. Caudal rami (fig. 10) reduced to two 

 small juxtaposed lamellae of conical form, each tei'minating in a 

 slender seta and having a small lateral hair. Ends of ovarial 

 tubes, as in most other Cypridse, ascending along the posterior 

 edges of the valves (fig. 1 ). 



Length of shell 0"53 mm., height 0'30 mm., width 0*22 mm. 



Remarks. — This form may be easily distinguished from any of 

 the other species here recoi-ded by the peculiar obliquity of the 

 shell, the left valve overlapping conspicuously the right dorsally, in 

 such manner that, in the lateral view of the shell (fig. 1), the line 

 of junction between the valves cuts oft', as it were, on the right 

 side a narrow mai-ginal area, extending along the greater part of 

 the dorsal side. 



Occurrence. — Two or thi'ee female specimens of this form were 

 found in the same sample (138) from which Paracyj^ria curta 

 was derived. Moreover, a single specimen, likewise of the female 

 sex, was found in another sample from Tanganyika (150), taken. 

 29/10/04 in Vua harbour (W. shore of lake). 



14. Cypridopsis sinuata, sp. n. (Plate LXIX. figs. 11-18.) 



Specific Characters. — Female. Shell less tumid ; seen laterally 

 (fig. 11) of .a somewhat reniform shape, greatest height occurring 

 a little in front of the middle and scarcely exceeding h;ilf the 

 length, both extremities somewhat obliquely rounded and nearly 

 equal, dorsal margin evenly curved, ventral distinctly sinuated in 

 the middle; seen dorsally (fig. 12) oblong-oval in form, greatest 

 width about equalling two-fifths of the length and occurring 

 somewhat behind the middle, anterior extremity acuminate, 

 posterior more obtuse. Valves lather thin and pellucid, slightly 

 unequal, the left overlapping the right somewhat along the 

 anterior extremity, and at the lower part of the posterior, but 

 not dorsally. Surface of shell smooth and finely hairy at both 

 extremities. 



Male (fig. 13) somewhat smaller than female and slightly 

 dittering in the shape of the shell, which is more deeply sinuated 

 below, and has the nnteinor extremity broader than the posterior 

 and more blvinted. Inferior antenna? (fig. 14) of exactly the same 

 structure as in the female, the third joint not being, as in the males 

 of Paracyjyria, subdivided. Prehensile palps of posterior maxillse 

 (figs. 1.5 & 16) rather dissimilar on right and left sides, that of 

 light maxilla (fig. 16) having the claw lamella dilated. Copu- 

 la tory appendages (fig. 17) with the terminal piece securiform in 



