130 MOLLUSCA. 



No. 383. [698, Cast]. Spirifer striatus, Martin. 



This large specimen of S. striata (tlie type of the genus), was found in the 

 Carboniferous Limestone of Enniskillen, Ireland. 



No. 383. Athyris ambigua, Sow. 



The hinge-line of this genus is curved; no area; foramen round; deltidium 

 obsolete; 100 species fossil; from Silurian to Jurassic. Carboniferous Lime- 

 stone, near Edinburgh, Scotland. 



No. 384. Athyris concentrica, Buck. 

 Devonian, Romersheim, Gerolstein, Prussia. 



No. 385. Athyris spiriferoides, Eaton. 

 Hamilton Group, Moscow, N. Y. 



No. 386. Athyris subtilita, Hall. 

 Carboniferous, Ruby Valley, Nevada. 



No. 387. Athyris vittata, Hall. 

 Corniferous, Clarke Co., Indiana. 



No. 388. Meristella barrisi, Hall. 



Corniferous, LeRoy, N. Y. 



No. 389. Retzia evax, Hall. 



Niagara Group, Waldron, Ind. 



No. 390. Uncites gryphus, Defr. 



In the Devonian of Europe. Devonian, Paflfrath, Germany. 



FAMILY STROPHOMENIDiE. 



Shell transversely oblong; depressed; hinge-line wide and straight; beak 

 small; valves plano-convex or concavo-convex; area notched. 



No. 391. Strophomena alternata, 



[Con. 



Shell of this genus semicircular, widest 

 at the hinge-line; concavo-convex; area 

 double; ventral valve notched; 129 species 

 known, all Palaeozoic. Cincinnati Group, 

 Covington, Ky. 



