13S AMERICAN JOURNAL 



TELLINA, Lin. 

 Subgenus, ANGULUS, Muhlfeldt. 



T. EBURNEOPSis, nob. — pi. 10, fig. 17. 



Description. — Subovate, inequilateral, thin in substance, 

 compressed, white, polished; apex slightly prominent, acute, 

 fold subniarginal, distinct; anterior margin regularly rounded; 

 posterior margin very oblique, subtruncated. at the end, and 

 angular at tip. 



One right valve only, in the collection, very distinct from 

 any other fossil species I have seen from the American Ter- 

 tiaries. 



T. ALBAEIA, nob.— pi. 11, fig. 7. 



Description. — Oblong, inequilateral, thin in substance, com- 

 pressed, white, with traces of one or two concentric bands; 

 fold obsolete. 



One left valve, very distinct from the preceding, or any 

 other American species knoAvn to me. 



Subgenus, TELLINELLA, Gray. 



T. LiNiFERA, nob. — pi. 10, figs. 16, 18. 



Description. — Oblong ; fold distinct, but not profound ; con- 

 centric lines acute anteriorly, and angulated over the fold. 



Two left valves, imperfect, the outlines of which have been 

 restored in the figures. The outline of fig. 18 is incorrectly 

 drawn; it should be nearer the proportions of fig. 16. 



AL VEIN US, Conrad. 



Desci'iption. — Equivalved, smooth ; anterior, posterior and 

 ventral margins channelled within ; hinge of right valve 

 emarginate under the apex, and having one pyramidal tooth 

 anteriorly; hinge of left valve with a pit under the apex, and 

 two compressed diverging teeth anteriorly ; pallial line entire ? 



A. MixuTA, nob. — pi. 10, fig. 2. 



Description. — Suboval or suborbicular, very inequilateral, 

 convex, smooth and shining ; margins rounded. 



This is a minute shell, much enlarged in the figure, and 

 common in the small quantity of marl which accompanies 

 the specimens. The family to which it should be referred is 

 undetermined, A microscopic channel margins the valves 

 within. 



SPH.ERELLA, Conrad. 



S. BULLA, nob. — pi. 10, fig. 9. 



Description. — Equilateral, orbicular, subspheroidal ; surface 

 with distant, shallow, concentric furrows, or undulations. 



