152 NEW- YORK FAUNA — MOLLUSCA. 



T. dislocata. (Cerithium id. Say, Ac. Sc. Vol. 2, p. 235. T. petitii, Kiener. Pl. 7, fig. 158 

 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 Oliva, 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. Shell 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, Id. Am. Conch, pl. 3. 

 Pl. 7, fig. 157 of this work.) Numerous brownish or fulvous zigzag marks on the surface, with 

 one or more light-colored obsolete revolving bands; often maculated. Length, 2*5. Southern 

 Coast. 



Genus Marginella, 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. Pl. 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. 



