152 NEW-YORK FAUNA — MOLLUSCA- 
T. dislocata. (Cerrtuium id. Say, Ac. Sc. Vol. 2, p. 235. T. petitii, K1ENEr. Pr. 7, obo 
of this work.) Shell small, polished, attenuated. Whorls with numerous minute impressed re- 
volving lines, and 15 — 18 transverse ribs to each whorl, which are dislocated near the summit of 
each whorl by a revolving line as deep as the suture. Color, chocolate-brown; ribs white: a pale 
revolving band on the body-whorl. Length, 0-8 — 1+3; of aperture, 0-2-0+*25. Maryland 
and the Southern coast. 
Genus Ox1va, Brug. Animal with approximated tentacles, enlarged at base, filiform at their extre- 
mities, bearing the eyes on a small enlargement on the middle portion. Foot very large, 
oblong, and furrowed across in front. Mantle with a single lateral lobe covering a great part 
of the shell, with two processes on the side of the branchial aperture, and forming a very long 
siphon in front: a single branchial pecten. Male organ voluminous, on the right side in 
front: opercle small, horny. Sell thick, subcylindric, convolute and smooth: spire short, 
with canaliculate sutures; aperture longitudinal, emarginate at base; columella obliquely 
striated or folded. 
O literata, Lam. (O. mutica, Say, Ac. Sc. Vol. 2, p. 228. O. literata, Ip. Am. Conch. pl. 3. 
Pu. 7, fig. 157 of this work.) Numerous brownish or fulyous zigzag marks on the surface, with 
one or more light-colored obsolete revolving bands; often maculated. Length, 2*5. Southern 
Coast. 
Genus Mareinetia, Lam. Animal with a small trunk: mouth with a small lingual riband, on 
which are numerous sharp denticulations; tentacles conical, with the eyes at the outer base 
on small tubercles; foot elliptical, very large; mantle with a lobe on each side, which 
may be reflected on the back of the shell, and in front a rather long siphon. Shell oblong- 
ovate, smooth: spire short; outer lip with a marginal longitudinal varix; base slightly 
notched; columella plicated; folds nearly equal. 
M. carnea. (Storer, Bost. Jour. Nat. Hist. Vol. 1, p. 465, pl. 9, fig. 3,4. Px. 7, fig. 159 of this 
work.) Right lip thick, indistinctly denticulated within, and continued in mature shells to the 
apex, which it partially or entirely covers: aperture narrowed; columella with four folds. Color, 
carneous or flesh-colored, with a transverse whitish band; right lip white. Length, 0°5; width, 
0:28. Key West, Florida. 
