BKACHIOPODA. 



129 



No. 374. Atrypa reticularis, Linu. 



Devonian, Eifel, Prussia. 



No. 375. Atrypa reticularis, Linn. 



Unusually large specimens, from the Corniferous, 

 at Charleston, Indiana. 



No. 376. Zygospira modesta, Say. 



This genus differs from Atrypa only in the minute character of the spiral 

 arm-supports. Cincinnati Group, Waynesville, Ohio. 



FAMILY SPIRIFERID^. 



Shell furnished internally with two spiral processes directed outwards, to- 

 ward the sides of the shell, to support the fixed oval arms. Extinct since the 

 Lias. 



No. 377. Spirifer micropter. 



In this genus the shell is transversely oval or elongated, trilobed, beaked, 

 bi-convex; hinge-line wide and straight; foramen angular; 300 species are dis- 

 tributed from the Lower Silurian to the Trias. Devonian, Gerolstein, Prussia. 



No. 378. Spirifer mucronata, 



[Con. 

 Hamilton Group, Widder, Canada. 



No- 379. Spirifer Owenii, Hall. 

 Corniferous, Charleston, Indiana. 



No. 380. [690, Cast]. Spirifer pinguis, 



[Sow. 



From the Carboniferous Limestone of 

 Kildare, near Dublin, Ireland, and now in 

 the "Ward Collection of the University of 

 Rochester. 



No. 381. Spirifer speciosus, Schloth. 

 Devonian, Gerolstein, Prussia. 



