MESOZOIC TIIVLE — TRIASSIC AND JURASSIC. 



779 



made of it and shells of Gryphcea arcuata (Etheridge). Apiocrinus Roissyanus 

 D'Orb. (Fig. 1273) is from the Middle Oolyte of Europe. Saccosoma pectinata 

 Ag. is a Comatulid, or free Crinoid, from the Oxfordian group. Of Echinoids, 

 the genera Gidaris (Eig. 1276), Hemicidaris, Pseudodiadema, and Hemapedina 

 include the larger part of the species. Pseudodiadema seriale (Fig. 1275) is 

 from the Lower Lias. 



Brachiopods of the spire-bearing genera had their last species in the 

 Jurassic period. These excepted, the Jurassic Brachiopods were mostly of 



1279 



1279-1285. 

 1280 



1283 



1284 



1281 



1282 



1285 



Beachiopods. — Figs. 1279, 1280, Cadomella Moorei (x ^) ; 1281, same, nat. size ; 1282, Spirit'erina Walcotti, Lias ; 

 1283, Terebratxila dlgona, Great Oolyte ; 1384, T. diphya, Tithonian ; 1285, Ehynchonella inconstans, Kim- 

 meridge. 



the Terebratxda, Wiynchonella, Thecidium, Lingida, and Discina families, 

 "which have also living species. 



Lamellihranclis were of several new genera. Gryphcea (Figs. 1287, 1290) , 

 of the Oyster family, having an incurved beak, commenced in the Lias and 



1286. 



1287. 



Lamellibeanchs. — Fig. 1286, Lima gigantea (x |), Lias ; 1287, Gryphsea incurva (Xf), Lias. 



continued into the Cretaceous. Fig. 1287, G. incurva, is from the Lias, and 

 1290, G. dilatata, is from the Oxfordian beds. Exogyra (Fig. 1289), also of 

 the Oyster family, is another characteristic genus, but more so of the Cre- 



