RECENT BRITISH OSTRACODA. 



461 



Carapace, as seen from the side, elongate siliquose, highest behind the middle ; greatest 

 height equal to much less than half the length. Anterior extremity much narrowed, 

 rounded; posterior produced, and somewhat angular in the middle; superior margin 

 well and evenly arched; inferior nearly straight in front, convex behind. Outline, as 

 seen from above, ovate, fully thrice as long as broad, broadest in the middle; extremities 

 equally acuminate. Colour dull yellowish white. The animal, so far as I have been 

 able to ascertain from dried specimens, exactly resembles P. variabile, except in the 

 various parts being more slender and elongated. 



Length -^ in. 



Hob. In shell-sand, Girdler Sand, estuary of Thames, and Donegal Bay (Mr. E. C. Davison) ; the Minch 

 [Mr. Jeffreys' s dr -edgings) ; Shetland and Peterhead (Mr. D. Robertson) ; Plymouth, Swansea, and 



Herm (Rev. A. M. Norman) . 



P. ensiforme appears to be perfectly distinct from any other described species, though 

 in general outline it rather approaches the form of P. variabile, figured at Plate XX3 V. 

 figs. 12, 13. The chief characteristics of the present species are its attenuated and 

 flexuous form, the median angulation of the posterior, and the comparatively dight 

 compression or keel-like projection of the ventral margin. 



9. Paradoxostoma flextjostjm, Brady. (Plate XXXV. figs. 30-31.) 



Bythocy there? flexuosa, Brady, Brit. Assoc. Report, 1866, p. 211. 



Carapace, as seen from the side, sublinear, flexuous, highest in the middle, greatest 

 height equal to one-third of the length; obliquely rounded, and sloping steeply in Iront 

 tapering to an obtusely angular median process behind ; superior margin evenly and 

 gently arched ; inferior sinuated in front, convex and compressed behind. " ■-" ■■ 

 seen from above, compressed, ovate, four times as long as broad ; ex.rennt.es acuminate 

 Colour yellowish white. Animal unknown. 



Length A- in. . _ .. . , 



Outl 



•b ux * 4 2 



Minch, 45-60 fathoms (Mr. J. G. Jeffrey 



M. Norman 



10. Pakadoxostoma ? ARCUATUM, n. sp. (Plate XXXV. figs. 37, 38 



highest in the middle ; greatest 



Cara pace) as seen from the side, ^ rf ^X*L*- - — • * 

 height equal to little more than one-third of the lea , ^^ .^^ 



&ont, obliquely rounded behind ; superior margin bolojy ^ 



**«ut, uuiiqueiy rounaea uemuu , oi*^* — — « +„-:,«. nn A 



smuated in front of the middle, slightly convex behind ; anterior and 



Outline 



from abov 



compressed and marked by radiating « r ^" t width equ ' a i to one-fourth of the 

 compressed ovate, broadest behind the middle , gieatest wi h 

 length. Colour pearly white. Animal unknown. 

 Length & in. 



Hab. Birterbuy Bay, 10 fathoms. 



One specimen only found. 



