B22 EXPLANATION or PLATES. 



EIG. 



197. a. Crania personata, dorsal valve ; b. C. antiquata, interior. 



(This would be more properly placed in Brachiopoda.) 



198. Hippurites Cornucopia, (from Blainville.) 



199. Hipponyx Cornucopia, attached valve. 



200. Upper valve of the same. 



Fam. Brachopoda, 



201. Orbicula laevis. 



202. Terebratula Psittacea ; a. anterior margin. 



203. Atrypa reticularis. Trigonotreta, Konig. 



204. Cyrtia exporrecta. 



205. Delthyris plycotes, (from Dalman.) 



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

 206*.Producta antiquata. 



207. Grthis basalis, Dalman. Strophomena, Bafinesque. 



208. Trigonosemus Lyra, Konig. 



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. Ijevis. 



214. Spirifer trigonalis. I _ . ^ . .- ^ 



„T ^ T , f Trigonotrata, Konig, (from Sow. Gen.) 



215. dorsatus. J ° ^ o^ v / 



216 Thecidium recurvirostrum. 



. (Here should come Crania, see Budistes.) 



217. Pycnodonta radiata, (from Bischer.) 



218. Plinge of the same. 



219. Lingula Anatina. 



Class, MOLLUSCA. 



Order, Pteeopida. 



220. Atlanta helicialis. 



221. Cleodora cuspidata. 



222. Creseis spinifera. 



