1910.] OSTRACODA FROM TANGANYIKA. 739 



9. Paracvpria opaca, sp. n. (Plate LXVII. figs. 10-15.) 



Specific Characters. — Female. Shell modei-ately compressed ; 

 seen laterally (fig. 10) oval in shape, greatest height occurring 

 somewhat in front of the middle and exceeding half the length, 

 both extremities obtusely rounded, the anterior one somewhat 

 broader than the posterior, dorsal margin almc st straight in the 

 middle, with slight trace of an angle immediately behind the 

 ocular region, ventral margin A^ery slightly concave in the 

 middle; seen dorsally (fig. 11) oblong in shape, greatest width 

 somewhat exceeding one-third of the length and occurring behind 

 the middle. Viilves rather thick and more or less opaque, so as 

 not to allow the limbs to be traced through tlieir walls ; left valve, 

 as usual, a little larger than riglit and overlapping it along the 

 whole anterior extremity, antei-ior lij? of this valve considerably 

 thickened and crossed by a number of somewhat irregular grooves, 

 some of which divide at the end into tine stripes (fig. 13); 

 inner duplieatures of both valves rather broad. Surface of shell 

 of a dull appeai'ance, being sculptured by numerous impressed 

 dots, larger and more distant in the centre of the valves (see 

 fig. 12), very densely crowded in the peripheral parts, where they 

 are partly arranged in curved lines (fig. 10). Anterior legs 

 (fig. 14) less strongly built than in the two preceding species, 

 with the dactylus i-ather slender and only slightly curved. 

 Caudal rami (tig. 15) almost straight, claws of moderate size, 

 dorsal seta vei-y small. 



Length of shell 0*63 ram., height 0"34 mm., Avidth 0'22 mm. 



Remarks. — By the thick opaque shell with its pronounced 

 sculpture, this form looks A-ery unlike the other species of the 

 genus. On a closer examination of the several appendages, 

 however, I haA'e failed to detect any essential difference in their 

 structure from that of the more typical species, and find it thus 

 impossible to separate this form generically. 



Occurrence. — Some few female specimens of this species were 

 found in the same sample (138) in which P. humilis occurred. 

 Solitary specimens were, moreover, found in two other samples 

 from Tanganyika, the one (82) taken 27/8/04 in Kituta Bay, 

 the other (97), 19/9/04, at ISTiamkolo, both localities lying at the 

 south end of the lake, 



10. Paracypria claviformis, sp. n. (Plate LXVIII. figs. 1-10.) 



Specific Characters. — Female. Shell highly compressed ; seen 

 laterally (fig. 1) oblong claA'iform in shape, greatest height 

 occurring far in front and not attaining half the length, anteiior 

 extremity obliquely rounded and somewhat deflexed, posterior 

 much narroAA^er and exserted below to a triangular posteriorly 

 pointing corner, dorsal margin subangular in the ocular region 

 and sloping obliquely behind, being for some extent neai'ly 

 straight, A^entral margin eA-enly concaA-e in the middle ; seen 

 dorsally (tig. 2) narrow fusiform in outline, greatest AA'idth not 

 nearly attaining one-third of the length and occurring in the 



