7;}8 TROF. G. o, SAiis o\ [May 3, 



of both valves thin and pelliu-id. Surface of shell quite smooth, 

 without any trace of sculpture, hut distinctly hairy at both 

 extremities. Eye veiy large and cons})icuous. Anterior legs 

 (tig. 3) much more coar.sely built than in any of the preceding 

 species, dactylus very strong, with falciform curve and clothed 

 inside in its outei- part witii line spinules. Caudal rami (tig. 4) 

 of the structure characteristic of the genus, being slightly curved 

 at the base and a little tapered distally ; claws rather strong and 

 finely spinulose inside, the distal one about half the length of the 

 ramus ; dorsal seta well developed. Ends of ovarial tubes not 

 detlexed, but extending upwards along the posterior edges of the 

 valves (fig. 1). 



Length of shell 0-61 mm., height 0-28 mm., width 0-21 mm. 



Remarks. — This form is easily distinguishable from any of the 

 pi-eceding ones by the narrow and pronouncedly I'eniform shell 

 axid by the coarsely built anterior legs. In the structure of the 

 other limbs I have failed to detect any essential difierence from 

 those in the preceding species. 



Occurrence. — Only two female specimens of this form have come 

 under my notice. They were found in a sample from Tanganyika 

 (169), taken 18/11/04 at Kala (E. shore of lake). 



8. Paracypria humilis, sp. n. (Plate LXVII. figs. 5-9.) 



Specific Characters. — Female. Sliell rather compressed ; seen 

 laterallv (fig. 5) of narrow elliptical form, greatest height occur- 

 ring about in tlie middle and not attaining half the length, both 

 extremities obtusely rounded and nearly equal, dorsal margin 

 very slightly curved, ventral nearly straight ; seen dorsally (fig. 6) 

 narrow oblong in form, greatest width only slightly exceeding 

 one-third of the length and occurring behind the middle, both 

 extremities somewhat blunted at the end, the anterior narrower 

 than the postei-ior. Valves rather pellucid, though not so thin 

 as in P. reniformis, and only slightly unequal. Suiface of shell 

 smooth, and" finely hairy at each extremity. Anterior legs (fig. 8) 

 I'esembling in structure those in F. reniformis, heing very coarsely 

 built, with the dactylus strong and abruptly curved at the end. 

 Caudal rami (fig. 9) markedly curved, claws n\oderately strong 

 and quite smooth, dorsal set;r very small. 



Male (fig. 7) of about same size as female, and scarcely diflfering 

 in the shape of the shell. 



Length of shell 0-48 nun., height 0-22 mm., width 016 mm. 



Remarks. — This is a very small species and may easily be 

 rocotniized by the rather regular elliptical shape of the shell. It 

 is undoubtedly iiearest allied to P. reniformis, exhibiting a very 

 similar strong'development of the anterior legs. 



Orcarreiice. — Some few sj)eciniens of this form were found in a 

 sauijile from Tanganyika. (IHH), taken 13/10/04 at Sumlni (S.W. 

 of liike), and a .solitary male specimen was found in the same 

 smi|)le (169) in which /'. reniformis occurred. 



