300 EXPLANATION OF PLATES. 



FIG. 



205. Delthyris plycotes, (from Dalman.) 



206. Leptsena depressa, Dalman. Producta, Sow. (from Sow. Gen.) 

 206*. Producta antiquata. 



207. Orthis basalis, Dalman. Strophomena, Rafinesque. 



208. Trigonosemus Lyra, Kbnig. 



209. Magas pumilus, Sow. 



210. Gypidia conchidium, (from Dalman.) 



211. Interior of the large valve of the same, (from Dalman.) 



212. Pentamerus Aylesfordii, (from Sow. Min. Con.) 



213. lsevis. 



214. Spirifer trigonalis. "J _.. , I . 



, > Trigonotreta, Konig, (from Sow. Gen.; 



215. dorsatus. j & > S> v 



216. Thecidium recur virostrum. 



(Here should come Crania, see Rudistes.) 

 217- Pycnodonta radiata, (from Fischer.) 



218. Hinge of the same. 



219. Lingula Anatina. 



Class, MOLLUSCA. 



Order, Pteropoda. 



220. Atlanta helicialis. 



221. Cleodora cuspidata. 



222. Creseis spinifera. 



223. Cuvieria columella. 



224. Spiratella limacinea, with animal ; Limacella, Lam. Limacina 



Cuvier. (from Blainville.) 



225. Vaginula Daudinii. 



226. Hyaleea tridentata. Archonte, Montf. 



Order, Gasteropoda. 

 Fam. Phyllidiana. 



227. Chiton spinosus. 



228. Chitonellus striatus. (from Sow. Gen) 



229. Patella oculus ; a. anterior. 



