1910.J OSTRACODA FROM TANGANYIKA. 747 



lapping the right along the nnteiiov extremity ns also somewhat 

 along the lower part of the posterior, hind corner of this valve 

 ai'med with two delicate triangular teeth, tliat of right valve 

 Avith a single such tooth placed somewhat farther above (fig. (5). 

 Surface of shell smooth, but rather densely hairy at both ex- 

 tremities. 



Length of shell 0*47 mm., height 0*24 mm., width 0-25 mm. 



Remarks. — This foimi may :it once be distinguished from any 

 of the other species here recorded by the unusually tumid shell, 

 the width of which even somewhat exceeds the height. The 

 armatui'e of the hind corner of each valve is also characteristic. 



Occurrence. — A solitary female specimen of this form was 

 found in a sample from Tanganyika (138), taken 13/10/04 at 

 Sumbu (S.W. of lake). 



21, Cypkidopsis coxgenera, sp. n. (Plate LXXI. figs. 7-9.) 



Sjyecific Characters. — Female. Shell moderately tumid ; seen 

 laterally (fig. 7) of oval lenifoim shape, gi'eatest height occurring 

 about in the middle and slightly exceeding half the length, both ex- 

 tremities rounded and slightly deflexed, dorsal margin irregularly 

 curved, with trace of an angle behind the ocular region, ventral 

 margin very slightly concave in the middle ; seen dorsally (fig. 8) 

 oblong-ovate in foi-m, gi'eatest width occurring behind tlie middle 

 arid not attaining half the length, aiiteiioi- extremity acuminate, 

 posterior blunted. Valves slightly unequal, left valve overlapping- 

 the right somewhat along the anterior extremity, but scarcely 

 behind. Surface of shell smooth and finely hairy at both 

 extremities. 



Male (fig. 9) a little smaller than female and having the 

 posterior extremity of the shell somewhat narrower. 



Length of shell 0*52 mm., height 0-28 mm., width 0-23 mm. 



Remarks. — This form is closely allied to G. simtata, exhil)iting 

 a rather similar shape of the shell. It is, however, of larger size 

 and has the ventral margin of the shell much less sinuated. 



Occurrence. — Three specimens of this form, two females and one 

 male, were found in the same sample from which C. tumidida 

 was derived. 



22. Cypridopsts gibba, sp. n. (Plate LXXI. figs. 10-12.) 



Specific Characters. — Female. Shell somewhat compi'essed ; seen 

 laterally (fig. 10) of oval tiigonal shape, greatest height occurring 

 about in the middle and exceeding half the length, anterior 

 extiemity bi'oad]}- I'ounded, posteiior somewhat nari'owei- and 

 blunted at the end ; dorsal mai'gin foiining in the middle an 

 abrupt angular curve and sloping from thence evenl}' to each 

 extremity, ventral margin exhibiting in the middle a distinct 

 sinus, in front of which is a slight convexity : seen doi'sallv 

 (fig. 11) oblong-ovate in shape, greatest width not nearly attaining 

 half the length and occurring about in the middle, anteiior 



