220 My. G. t^. Brady on Marine O sir acoda from Tenedos. 



XXIV. — Contributions to the Study of the Entomostraca. 

 By George Stewaedson Brady, C.M.Z.S. &c. 



No. III. Marine Ostr acoda from Tenedos, 



[Plates XIV. & XV.] 



In this gathering, for which I am indebted to my friend Mr. 

 Thomas Blain, of Sunderland, the chief point of interest is the 

 occurrence of two British species, Cy there antiquata (Baird), 

 and Pontocypris (?) angusta^ Brady. The shells of the second 

 are empty, and I am not yet able to state with certainty whe- 

 ther the generic position assigned to it is con-ect. The first- 

 named occurs abundantly, and is very finely developed; I 

 have noticed it also in other collections from the shores of the 

 Levant and Grecian Archipelago. The prevailing species in 

 the gathering are Cythere tarentina, Baird, G. Speyeri^ Brady, 

 C.favoideSj Brady, and Loxoconcha affinis, Brady. 



List of Species. 



Cypridje. I Cythere prava {Baird). 



o A 1 • 1 I. 11 T> 7 I fistulosa (Baird) 



rAfflaia pulchella, -ffroav- i /o - ): n • j\ 



■n 4. • /-o\ 4. T> J (:'= runcmata, i»aira). 



I'ontocypnsir) anffusta, 2»yrt«v. ! ^ ,. i* • ^ 



• A v f senticosa, Batrd 



intermedia, nov. sp. ' 



Bairdia formosa, n&v. sp. 



CYTHERIDiE. 



Cythere favoides, nov. sp. 



Speyeri, nov. sp. 



tarentina, Baird. 



crispata, now sp. 



dissimilis, nov. sp. 



(= hystrix, Beuss). 

 antiquata (Baird). 



Loxoconcha affinis, Brady *. 



alata, nov. sp. 



Xestoleberis margaritea, Brady^. 

 Cytherura acris, nov. sp. 

 Sclerochilus (?) segaeus, nov. sp. 

 Paradoxostoma(?) reniforme, woy. 



SJ). 



Pontocypris intermedia^ nov. sp. (Plate XIV. figs. 1, 2.) 



Shell, viewed from the side, subtriangular j greatest height a 

 little in front of the middle, and equal to half the length : 

 anterior extremity broad and well rounded, posterior nar- 

 rowed, almost angulated : superior margin forming an ob- 

 tuse angle a little in front of the middle, thence sloping 

 with a gentle curve to the front, but much more steeply 

 backward ; inferior margin scarcely sinuated. Outline, seen 

 from above, ovate, with pointed extremities ; greatest width 

 situated in front of the middle, much less than the height. 

 Colour white ; surface smooth, granular. Length -^j inch. 



This presents characters intermediate between those of the 



* Normannia affinis^ Brady, Trans. Zool. Soc. vol. v. p. 382. 

 t Cytheridea margaritea^ Brady, ihid. p. 370. 



