122 EXPLANATION OF PLATES. 
Fam. Ostracea. 
FIG. 
179 Pedum Spondyloideum, (from Sow. Gen.) 
180 Ostrza edulis. 
18] Folium. Dendostrza, Sw. 
182 Gryphea incurva. 
183 Exogyra conica, (from Sow. Min. Con.) 
184 Placuna placenta. 
185 Vulsella lingulata. 
186 Anomia ephippium. 
187 Hinge of the same, with bony process. 
188 Hinge, shewing the fissure. 
189 Placunanomia Cumingii. 
190 Hinge, shewing the fissure. 
191 Hinge of the unattached valve. 
192 Mulleria, (from Sow. Gen.) 
Fam. Rudistes. 
193 Spheerulites foliacea. (Radiolites is more conical. ) 
194 Calceola Sandalina. 
196 Birostrites inzequiloba, internal cast of Sphzerulites. 
197 a. Crania personata, dorsal valve ; b. C. antiqua, interior. 
(This would be more properly placed in Brachiopoda. ) 
198 Hippurites Cornucopia, (from Blainv. ) 
199 Hipponyx Cornucopia, attached valve. 
200 Upper valve of the same. 
Fam. Brachiopoda. 
201 Orbicula levis. 
202 Terebratula Psittacea. a, anterior margin. 
203 Atrypa reticularis. Trigonotreta, Konig. 
204 Cyrtia exporrecta. 
205 Delthyris plycotes, (from Dalmap.} 
206 Leptzena depressa, Dalman; Productus, Sow, (from 
Sow. Gen.) 
206*Productus antiquatus. 
207 Orthis basalis, Dalman; Strophomena, Raf. 
208 Trigonosemus Lyra, Konig. 
209 Magas pumilus, Sow. 
210 Gypidia conchidium, (from Dalman.) 
211 Interior of large valve, of the same, (from Dalman.) 
212 Pentamerus Aylesfordii, (from Sow. Min. Con.) 
213 ——_——_—_ levis. 
214 Spirifer trigonalis.| Trigonotreta, Konig, (from 
215 dorsatus. \ Sow. Gen.) 
216 Thecidium recurvirostrum. 
(Crania should come in here, See Rudistes.) 
217 Pycnodonta radiata, (from Fischer.) 
