784 PROF. G. o. SARS OX [May 3, 



Occurrence. — Solitai-y specimens of tin's fine species were found 

 in three different samples from Tanganyika. One of these samples 

 (88) was taken 7/9/04 at Niamkolo (S. end of lake), another (97) 

 19/9 04 at about 'the .same place, and the third (138) 13/10/04 at 

 Sumbu (S.W. of lake). 



2. Paracypria complaxata, sp. n. (Plate LXIV. figs, 9, 10.) 



Specific Characters. — Male. Shell highly compressed ; seen 

 laterally (fig. 9) oval reniform in .shape, greatest height occuri-ing 

 about in the middle and equalling half the length, anterior 

 exti'emity obliquely rounded and somewhat defiexed, po.sterior 

 narrower and obtuse at the end, dorsal mai'gin almost angulaily 

 curved in the middle and sloping behind with a slight curve to 

 the posterior extremity, ventral mai'gin slightly concave in the 

 middle; seen dorsally (fig. 10) very narrow, with the greatest 

 width scarcely exceeding one-quarter of the length. "Valves 

 i-athei- pellucid and somewhat more unequal than in the preceding 

 species, the right one being consjiicuously overlapped by the left 

 at the anterior extremity below. Sui'face of shell with scattered 

 dots and finely haiiy at both extremities. 



Length of shell 0*96 mm., lieight 0*49 mm., Avidth 0*24 mm. 



Remarks. — This form is of still larger size than the preceding 

 one, from which it moi'eover difiers conspicuously in the form 

 and sculpture of the shell. The structure of the several appen- 

 dages could not be sufficientlj' examined in the solitai-y specimen 

 found, but no essential difference in this respect from that in the 

 preceding species was to be traced. 



Occihrrence. — Only a single specimen of this form, a fully 

 grown male, has been secured. It was found in a sample from 

 Tanganyika (242) taken 1/3/05 at Kaboge (IST.W. shore of the 

 lake). 



3. Paracypria coxoidea, sp. n. (Plate LXIY. figs. 11, 12.) 



Specific Characters. — Male, Shell rather compressed ; seen 

 laterally (fig. 11) of a narrow, somewhat conoid shape, greatest 

 height occurring far in front and about equalling half the length, 

 anterior extremity evenly roiuided and much broader than the 

 po.sterior, which is conically tapered, though obtuse at the end, 

 dorsid margin gently curved and sloping evenly behind to the 

 posterior corner, ventral margin nearly straight ; seen dorsally 

 (fig. 12) narrow oblong in form, with the greatest width about 

 equalling one-third of the length, l)oth exti'emities obtusely 

 acuminate. Valves moderately pdlucid and rather une(pial, the 

 light being considerably overlapped by the left along the whole 

 .'interior extremity; lip of the latter somewhat thickened and 

 giving origin to a row of very delicate hairs. Surface of shell 

 dotted in a similar manlier to that in P. complanata. 



Length of shell 0-49 mm., height 0*24 mm., width 0-15 mm. 



/'emarks. This is s\ rather small species, being scarcely more 



