20 AMERICAN MARINE CONCHOLOGY. 



by a dozen rib-like undulations, and with numerous revolving 

 lines; mouth oval, brownish within, canal short. Low water to 

 fifteen fathoms. 



Length 25 ; diam. 15 mill. 



Inhabits the whole coast. 



Genus RANELLA, Lain. 

 Extr. d. Cours. 1812. 

 Shell ovate or oblong, compressed, with two rows of continuous 

 varices, one on each side; aperture oval; columella arcuated; 

 canal short, recurved ; outer lip crenulated. 



The species are mostly tropical. They crawl with considerable 

 animation and rapidity. 



1. R. caudata, Sa}\ Fig. 18. 



Journ. Acad. Nat. Sci., Philad., ii. 236. 1S22. 

 Fttsus jyyruloides, Du Kay. Moll., New York, 147, t. 9, f. 191. 1843. 

 Eupleura caudata, Say. Stimpson, Am. Journ. Conch., i. 58. 1865. 



Shell solid, whorls five, with nine stout, vertical rtbs, besides the 

 varices, crossed by numerous revolving lines. Lip thick, bordered 

 within by raised granules. Reddish-brown, white or bluish-white 

 within. Operculum chestnut. 



Length 1 inch ; width .05 inch. 



The head and tentacles and the siphon are nearly white, the 



foot light yellow. 



Massachusetts to Georgia. 



Genus FASCIOLAKIA, Lamarck. 



Prodr. 1799. 



Shell fusiform ; spire acuminated ; aperture oval, elongated, as 



long as the spire ; siphonal canal straight ; columella smooth, with 



a few oblique plaits at the forepart ; outer lip internally crenate. 



Operculum claw-shaped. 



There are over one hundred species; tropical or subtropical in 

 distribution. 



1. F. gigantea, Kiener. Fig. 19. 



Icon. Coq., Viv. Fasciolaria, p. 5, t. 10 and 11. 

 Shell symmetrically fusiform, spire acuminately turreted; whorls 

 somewhat obsoletely obtusely ridged throughout, scarcely angu- 

 lated around the upper part, armed with large swollen tubercles; 

 fleshy-white, covered with a subtransparent yellowish-chestnut 

 horny epidermis, columella and interior of the aperture reddish. 



