250 



also of opinion, that the form recorded by G. W. Miiller from the Gulf of 

 Naples under the name of Paracytherois rara is the very same species. It 

 ought to be considered as the type of the present genus. 



Occurrence. Several specimens of this form have been taken, long ago, 

 off the west coast of Norway, from deep water among Hydroidae, but were 

 only quite recently identified. 



Distribution. British Isles, Mediterranean. 



Fossil. Scotland. 



138. Paracytherois flexuosa, (Brady). 



(PI. CXIII, fig. 2). 



Paradoxostoma fle\no?nm, Br.idy, Mon. Brit. Ostracoda, p. 461, PI. XXXV, figs. 30-34. 

 Syn: Paracytherois strlata, G. W. Miiller. 



Specific Characters. Female. Shell, seen laterally, of a very narrow and 

 peculiar flexous shape, distinctly attenuated both behind and in front, greatest 

 height about in the middle and scarcely exceeding l /s of the length, dorsal 

 margin forming a strong and quite even arch sloping rather steeply towards 

 the anterior extremity, ventral margin distinctly sinuated in front of the middle 

 and gently bowed behind, anterior extremity narrowly produced below, almost 

 beak-shaped, though rounded off at the end, posterior somewhat exerted and 

 narrow obtuse; seen dorsally, lancet-shaped, with the greatest width not nearly 

 attaining l l\ of the length, both extremities sharply pointed and nearly equal. 

 Valves very thin and transparent, with the surface smooth and polished, though 

 on a closer examination exhibiting traces of an extremely fine longitudinal 

 striation, marginal area rather narrow in front, but considerably widening along 

 the ventral face. Structure of the several appendages only very little differrent 

 from that in the preceding species. 



Colour of shell whitish pellucid. 



Length of adult female 0.60 mm. 



Male not observed. 



Remarks. The present species is nearly allied to the preceding one, but 

 is easily distinguished by the characteristic shape of the shell, as seen laterally. 

 It seems to me evident, that the form recorded by G. W. Miiller from the 

 Gulf of Naples under the name of P. striata is the same species. 



Occurrence. A few female specimens of this form were found together 

 with the preceding species, the exact locality not being ascertained. 



Distribution. British Isles, Holland, Fosse de Cap Breton, Bay of Biscay, 

 Mediterranean. 



