Mr. G. S. Brady on undescribed Fossil Enlomostraca. 189 



XXV, — On undescribed Fossil Entomostraca from the Brick- 

 earth of the Nar. By George Stewaudson Brady. 

 [Plate IX.] 



For the opportunity of describing the following species of Ostra- 

 coda I am indebted to the kindness of Professor T. Rupert Jones, 

 from whom I received the specimens. An account of the deposit 

 in which they occurred was given in the ' Geological Magazine/ 

 vol. ii. p. 8, to which the reader is referred. The carapaces were 

 very iitw in number, and belonged to the four species here 

 described. 



Order OSTRACODA. 

 Fam. Cypridse. 

 Genus Cytheridea, Bosquet. 

 Cytheridea punctillata, n. sp. PI. IX. figs. 9-11. 

 Valves oblong, subtriangular, convex. Dorsal margin gently 

 arched, highest at its anterior third ; ventral margin straight. 

 Anterior border broad and well rounded ; posterior narrower, 

 and sloping steeply to its lower extremity, which forms a 

 rounded angle. Seen from above, the carapace is oval in out- 

 line, and shows scarcely any appearance of pitting. End view 

 suborbicular. Surface marked with fine and thickly set 

 puncta. Length ^rVth of an inch. 



This is nearly allied to Cytheridea pinguis, Jones, and to 

 Bairdia punctatella, Bosquet, but is not strictly referable to 

 either of these species. It differs from the former in surface- 

 ornament, as well as in the absence of angulation of the dorsal 

 border; from the latter, as well as from B. Ilebertiana, in its 

 more triangular shape and finer surface-ornament. 



Genus Cythere, Miiller. 

 Cythere carinata, n. sp.* PI. IX. figs. 1-4. 

 Carapace obliquely subtetragonal, convex; margins flexuous. 

 Dorsal margin arched, gibbous in the middle ; ventral margin 

 convex, produced anteriorly into a broad, strongly developed 

 keel. Anterior extremity narrow, bordered partially by the 

 ventral keel; posterior extremity broad, somewhat truncate. 

 Dorsal outline broadly oval. End view ovate, tumid. Surface 



* This species was noted by Prof. T. R. Jones in the * Geological Maga- 

 zine,' vol. ii. p. 306, under the name Normania carinata. I have, however, 

 thought it advisable to abandon the MS. genus Normania, which was 

 meant to include the " peach-stone " forms, but which I found incapable 

 of accurate definition or separation. 



