212 Eocene Fossils of the United States. 
prominent towards the apex, becoming obsolete near the base; ap- 
erture round. (Plate I) fig. 2.) 
Dentalium thalloides, Con., Foss. Shells os Tert. Form., p. 34, 
August, 1833. 
D. alternatum, Lea, Gon to Geol. Plate 1 fig 2 Dec. 1833. 
Claiborne, Aiberea 
This species is abundant and very elegantly striated. It is 
delicately pointed and thin at base. In Chenu’s splendid work 
there is an excellent figure of it. \ 
DENTALIUM ARCIFORMIS. Regularly curved, tapering very grad- 
ually, round, polished, very thick at the ge (Plate I, fig. 3.) 
Claiborne, Alabama. 
I have but three imperfect specimens of this species, and they 
do not suffice to exhibit the complete outline of the shell. It is 
much more elongated and tapering than Lea’s D. turritum, which 
L have. not seen. The turrited form of the superior margin of the 
latter species is probably accidental, the result of fracture. 
ANGUINELLA. 
I propose this name for a gens resembling Perpula i 3 | external 
characters, but distinguished by sept 
which are entire or enclose chambers without a channel of com- 
munication. I find two species only, one of which occurs in the 
Miocene of Virginia. 
ANGUINELLA oRNaTA. Contorted, glomerated, with irregular 
transverse furrows and longitudinal unequal strie, which are 
roughened by granulations, frequently obsolete. (Plate I, fig. 4.) 
Serpula ornata? Lea, Cont. to Geol., Plate I, fig. 5. 
S&S. squamutlosa, Con., Journ. Acad. Nat. Sci., Vol. vii, p. 149. 
Claiborne, Alabama. 
This species is rare; it is occasionally convoluted, and when 
this is the case, one side is flattened, and attached to other speci- 
mens or to stita shells, &c. 
F'IsTULANA. ‘ 
_ ‘The genus Fistulana, Lam., has not been noticed in a formation 
below the Eocene strata, and there are few species in a fossil state. 
I have met with one only either recent or fossil as an American 
species. Deshayes has found six species in the Eocene of Paris. 
Fistunana Larva. Ovate-oblong, ventricose ; thin and fragile; 
anterior margin short, straight, very oblique; extremity angula- 
