292 Organic Remains of the 



ROSTELLARIA. 



R. arenarum. (S. G. M.) PI. V, fig. 8. Noticed, but not named 

 or figured in the former part of this Synopsis. 



TORNITELLA. 



1. T.? bullata. (S. G. M.) PI. V, fig. 3. Ventricose, with very 

 numerous striae : less than an inch long. 



2. A minute species, of which casts only are found. 



BIVALVES. 



TEREDO. 



T. tibialis. (S. G. M.) PI. IX, fig. 2. I propose this name for the 

 Teredo so common and so beautifully preserved in the calcareous 

 strata of New Jersey. The same species is also common in all the 

 varieties of marl. 



PHOLAS. 



Mr. Cooper showed me a cast about an inch long, with concentric 

 and longitudinal striae, and a longitudinal groove. — Found in Mon- 

 mouth county, N. J. 



PHOLADOMYA. 



p. ocddentalis. (S. G. M.) PI. VIII, fig. 3. Oblong-angular, ven- 

 tricose near the beaks; with twenty five or thirty narrow, elevated, 

 subtortuous costae, having broad, slightly concave intervening spaces. 

 Length two inches, breadth three inches. An extremely variable 

 species : I possess five specimens, (all more or less broken,) in all of 

 which there is a difference in the number and relative position of the 

 ribs. 



CTTIIEREA. 



C excavata. (S. G. M.) PI. V, fig. 1. Suborbicular, compressed, 

 posterior slope deeply excavated ; posterior side with an obsolete 

 fold , margin angular. New Jersey. 



CARDITA. 



C. decisa. (S. G. M.) PI. IX, fig. 3. A solitary cast obtained by 

 me at St. Georges, Delaware. 



NUCULA. 



A few small casts in ferruginous clay, near Bordentown, New 

 Jersey. 



PLAGIOSTOMA. 



p. gregalis. (S. G. M.) PI. V, fig. 6. Shell irregular, thin ; 

 back armed with concentric squamous plates ; within obsoletely stria- 



