740 PROF. G. o, sAiis OX [Mav 3, 



initlille, l)otl> extremities aomniuate. Valves veiT thin and 

 pelliH-id, nearly equal and witiiout any visible jnlosity. 8urface 

 of shell quite smooth ; inner coating exhibiting a f;iint reticulation, 

 more obvious at the anterior exti-emity. Muscular impressions 

 in the centre of the valves densely crowded and arranged in the 

 visual manner (fig. 4). Lind)S (figs. 5-9) on the whole built 

 upon the same type as in the other species. Caudal rami (fig. 4) 

 unusually short and broad, evenly curved and highly chitinized ; 

 claws rather thick and scarcely at all curved, their outer part 

 being clothed inside with fine spinules; dorsal seta well developed. 



Male (fig. 3) of about same size as female, and exhibiting a 

 very similar shape of the shell. Sexual characters developed in 

 the very same manner as in the other species of the genus. 



Length of shell 0-58 mm., height 0-28 mm., width 0-17 mm. 



Remarks. — This is a very distinct species, exhi])iting a, rather 

 characteristic shape of the shell, and also distinguished 'hy the 

 coarse structure of the caud^d rami. It must, however, evidently 

 be regarded as a member of the present genus, as proved by the 

 structure of the several limbs. 



0cct<.rre?i.c6.— Several specimens of this remarkable form, the 

 •Greater number of them still innnature, were picked up from 

 the bottom-residue of a sample from Tanganyika (138), taken 

 13/10/04 at Sumbu (S.W. of lake). It was not found in any of 

 the other samples. 



11. Paracypria flexuosa, sp. n. (Plate LXVIII. figs. 11-17.) 

 Specific Characters. — Female. Shell highly compressed, seen 

 laterally (fig. 11) narrow reniform in shape, greatest height 

 occurring about in the middle and not nearly attaining half the 

 length, anterior extremity evenly rounded and conspicuou.sly 

 deflexed, jwsterior a little nai-rower and obtuse at the end, dorsal 

 margin only slightly curved, ventral deeply sinuated in front of 

 the middle ; seen dorsally (fig. 12) narrow oblong, greatest width 

 scarcely exceeding one-quarter of the length and occurring 

 somewhat behind the middle. Valves rather pellucid and slightly 

 tuie([ual, the right one being somewhat overlapped by the left at 

 the inferior pait of both extremities. Surface of shell smooth 

 and shining, without any visible i)ilosity, but exhibiting a few 

 small dots, more di.stinct in the anterior part. Eyes of smaller 

 size than iii the other species and occurring close to the dor.sal 

 mari'in. Muscular impressions in the centre of the valves 

 (fig. 14) only little (littering from tho.se in the other .species. 

 Superior antenna' (tig. 15) with tlie setsxi somewhat reduced in 

 nuudier; natatory seta^ of the inferior ones apparently likewise 

 less fully developed than usua.l. Anterior legs (fig. Ki) rather 

 slender, with the dsictylus comi>aratively short. Caudal rami 

 (fig. 17) somewhat robust, of equ.d width throughout, and almost 

 sti-jiight ; claws compaiatively short ; dorsal seta very small but 

 distinct, occurring about in the middle of the ramus. 



Male (tig. I."!) agreeing with female both in size and in the 



