PLATE IX. 



The following Letters refer to the same parts and impressions in every figure. 



A, adductor muscles {add. longus, Owen) ; r, cardinal muscles {add. brevis and cardinalis, Owen) ; 

 p, pedicle muscles {retractor sup. and inf., Owen) ; J, cardinal process ; l, loop ; T, teeth ; 

 B, sockets ; D, deltidium ; v, vascular impressions, &c. 



Fig. 



212, 213. AuLOSTEGES Wangenheimi, Vern., sp. = {Variabilis, Helmersen). 



,, Interior of dorsal valve (slightly enlarged). 



„ Cardinal process, j, from a very remarkable specimen, published by 



Col. Helmersen. (Bull. Phys. Math., tab. vi, fig. 12.) 



„ The same, from another specimen in my collection. 



Prodtjctus semibeticulatus. From a specimen in the collection of Professor King. 

 punctatus. Ventral valve, with portions of the spines preserved. 



horridus. Interior of dorsal valve. 



„ Interior of ventral valve. 



longispinus. Interior of dorsal valve. 



proboscideus, Vern. From specimens in the collection of M. de Koninck. 

 224 — 226. Calceola sandalina, from the Eifel. 

 227- „ „ Interior of ventral valve. 



228. ,, „ Interior of dorsal valve. 



229. Ceania Brattenburgensis (Nummulo, Stoboeus). 

 230—232. „ antiqua, Def. 



„ Interior of the ventral valve. 



„ Interior of the upper or dorsal valve. 



Ignabergensis, Retzius. 



anomala (Patella anomala, Miiller) = genus Orbicula, Cuvier and Lamarck. 

 Hagenovi, De Koninck, MS. 



214. 





>> 



215. 





» 



216. 





»» 



217. 





Prodtjc 



218. 





3J 



219. 





s> 



220. 





3> 



221. 





)J 



222, 



223. 



3) 



233. 

 234. 



235, 236. 

 237, 238. 

 239. 

 240. 



Interior of lower or ventral valve, exhibiting two bosses, h, for attach- 



ment of sliding muscle 1 



241 — 243. Spondylobus craniolaris, M'Coy. 



244, 245. Pseudo-crania antiquissima, Eichw. sp. Type of Professor M'Coy's genus. 



246, 247. „ divaricata, M'Coy, sp. 



248 — 250. Discina lamellosa, Brod., sp. 



251. „ „ \nimox oilo'^ev OT ventral valve. 



252. „ „ Interior of upper or dorsal valve. 



253 — 255. 1 Orbiculoidea elliptica, Kut., sp. Genus Schizotreta, Kutorga. 



256 — 258. Trematis terminalis, Emmons, sp. (enlarged) = Orbicella, D'Orb. 



