48 CRETACEOUS GROUP 
From the calcareous strata of Gloucester, New Jersey. 
RosTELLARIA. 
1. R. arenarum,(S.G.M.)_ PI. v, fig. 8. 
Specific character. Whorls four or five, with elevated, lon- 
gitudinal coste, and broad, concave, intervening spaces. 
Length, about an inch and a half. 
A variable species, casts of which are common through- 
out the blue marls. 
2. R. pennata, (5S. G. M.) PI. xix. fig. 9. 
Specific character. Shell elevated, with about six convex 
volutions, and with obscure, oblique, longitudinal coste or 
undulations; body whorl ventricose; labrum expanded, sinu- 
ous. 
From Prairie Bluff, Alabama. 
3. I have some casts of a smaller and very distinct 
species from Delaware. 
TORNITELLA. 
1, T.? butlata, (S.G.M.) Ph vafiges. 
Specific character. Ovoidal, ventricose, with numerous trans- 
verse strie. 
Length, about one inch. 
From the marl of New Jersey. 
2. Casts of a smooth species, much smaller than the 
preceding, occur with it. 
NATICA. 
1. N. petrosa, (S.G. M.) PI. xix. fig. 6. 
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