44 AMERICAN MARINE CONCHOLOGY. 



arched, lip simple; fulvous brown or light-reddish ba} 7 , marked, 

 more or less plentifully, with white lunate spots, interior of the 

 aperture bluish-white or brownish. 

 Length 6^, diam. 4^ inches. 



Souther?i Coast, W. Indies. 



Genus CERITHIOPSIS, Forbes and Hanley. 



Brit. Moll., in. 364. 1853. 



Shell turreted, many-whorled, dextral, granulated; aperture 



subrotund ; inner lips broadly reflected ; outer lip acute, arcuated 



and produced anteriorly; aperture anteriorly sinuated ; canal 



short. Operculum corneous, concentric, nucleus terminal. 



1. C. Emersonii, Adams. Fig. 71. 



(Cerithium.) Bost. Journ. Nat. Hist., ii. 284, t. 4, f. 10. 



Shell long, conical; whorls seventeen, flat, each with three rows 

 of granules ; suture very deeply impressed ; aperture small, sub- 

 quadrate, about one-sixth the length of the shell ; columella 

 spirally twisted; canal less than half the length of the aperture. 

 Color dark reddish-brown. 



Length 13, diam. 3 mill. 



Animal with a long small foot, truncate in front, and notched 

 behind, pale with white flecks; head broadly rounded, dark flesh- 

 color in front. 



New England. 



2. C. terebralis, Adams. Fig. 72. 



Bost. Journ. Nat. Hist., hi. 320, t. 3, f. 7. 1841. 

 Elongated ; whorls ten to twelve, flattened, with three or four 

 elevated revolving ridges on each, with numerous fine longitudinal 

 lines between the ridges. Base abrupt; aperture oval, about one- 

 eighth of the total length of the shell. Color reddish-brown. 

 Length 12, diam. 3 mill. 



Animal whitish, with flakes of opaque-white, tentacles clouded 



Massachusetts. (Eur.) 



According to Gwyn Jeflfre3's this is a sj'nonym of trilineata, 

 Phil. (183G). 



Genus ACTJS, Humphrey. 

 Mus. Calonn. 1797. 

 Terebra (part.). Lamarck, Prodr. p. 71. 1799. 



Shell subulate, solid, porcellanous ; whorls numerous, simple; 

 aperture small, emarginate anteriorly, not produced into a canal; 



