BRACHIOPODA. 127 



No. 356. Terebratula semiglobosa, Sow. 

 Chalk (Upper Cretaceous), Roueu, France. 



No. 357. Terebratula biplicata, Defr. 

 Upper Greensand, Cambridge, Euglaud. 



No. 358. Terebratula sphaeroidalis, Sow. 

 Fuller's Earth, Oolite, Noyen, France. 



No. 359. Terebratella umbonella, Lamk. 



Lower Oolite, Calvados, France. 



No. 360. Terebratula gregaria, Suess. ' 

 Lower Lias, Hindelang, Bavaria. 



No. 361. Leptocoelia hemispherica, Sow. 



A mass of rock composed entirely of this shell. From the Clinton Group, 

 Rochester, N. Y. 



No. 362. Rensselaeria ovoides, Eaton. 



In this extinct genus of the Silurian and Devonian, eleven species are known. 

 Oriskany Sandstone, Schoharie, New York. 



FAMILY STRINGOCEPHALID^. 



Shell suborbicular, the hinge-margin rounded; under valve with deltidium 

 and opening under the prominent beak; cardinal process large. 



No. 363. [728, Cast]. StringOCephalus Burtini, Defrance. 



Two Specimens. In this genus the ventral valve is pro- 

 longed upwards into a very prominent, tapering beak, which 

 is sometimes so curved forward as to rest iipon the dorsal 

 valve. This latter has a very long cardinal process which 

 quite crosses the interior of the shell, and is forked at the ex- 

 tremity to meet the ventral septum. From the Devonian of 

 Paffrath, Germany. 



FAMILY RHYNCHONELLIDiE. 



Shells oblong or trigonal, beaked; hinge-line curved; no area; valves articu- 

 lated, convex, often sharply plaited; foramen beneath the beak, usually com- 

 pleted by a deltidium; elongated .spiral arms. 



No. 364. Rhynchonella alta, Hall. 

 Hamilton Period, Solon, Iowa. 



