292 : Organic Remains of the 
ROSTELLARIA. 
R. arenarum. (S.G.M.) Pl. V, fig. 8. Noticed, but not nam 
or figured in the former part of this Synopsis. 
TORNITELLA. 
1. T.? bullata. (S.G.M.) Pl. V, fig. 3. Ventricose, with very 
numerous striz : Jess than an inch long. 
2. A minute species, of which casts only are found. 
BIVALVES. 
TEREDO. : 
___ ¥. tinalis. (S.G.M.) PI. IX, fig. 2. I propose this name for th 
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 concentrie 
and longitudinal strie, and a longitudinal _groove.—Found in Mon- 
mouth county, N. J. ; . 
PHOLADOMYA. “ 
P. occidentalis. (S.G.M.) Pl. VII, fig. 3. Oblong-angular, ven- 
tricose near the beaks; with twenty five or thirty narrow, elevated, 
subtortuous coste, having broad, slightly concave intervening spaces. 
Length two inches, breadth three inches. An extremely variable 
species x1 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. 
CYTHEREA. ? wd 
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. re 
C. decisa. (S.G.M.) PI. 1X, fig. 3. A solitary cast obtained by 
me at St. Georges, Delaware. 
NUCULA. 
A few small casts in ferruginous clay, near Bordentown, New 
Jersey. ae Eat 
PLAGIOSTOMA. aes ie 
P. gregalis. (S. G. M.) Pl.V, fig. 6. Shell irregular, thins 
back armed with concentric squamous plates ; within obsoletely stri@- 
