MARINE MOLLUSCA OF THE UNITED STATES. 27 



Subgenus Trophon, Montfort. 



Shell fusiform, varices numerous, lamelliform or laciniatecl; 

 spire prominent ; aperture ovate; canal open, usually turning to 

 the left ; columella smooth, arcuated. 



These animals inhabit deep water in the Arctic Seas ; they are 

 distinguished from the typical Fusidoe by their smaller size and 

 lamellar varices. 



1. T. TRUNCATUS, Strom. Fig. 39. 



{Buccinum.) Norsk. Vid. Selsk. Skr., iv. 3G9, t. 16, f 26. 

 Troplion clathratus, Forbes & Hanley, Brit. Moll., iii. 430, t. Ill, f. 1, 2. 



(not Murex clatJiratus, Linn.) 

 Murex Bamffius (part.), Donovan, Brit. Shells, y. 109, f. 3. 



Shell small, brownish, with six rounded whorls ornamented with 



numerous sharp lamellar longitudinal ribs ; aperture rounded, 



columella arcuated, canal turned to the left. 



Length 13, diam. 6 mill. 



Maine, northicards ; England. 



2. T. scALARiFORMis, Gould. Fig. 40. 



(Fusus.) Silliman's Journ. Sci., xxxviii. 197. 

 Murex Bamffius (part.), Donovan, Brit. Shells, v. t. 169, f. 1. 



Shell reddish-brown ; whorls seven, convex, with deep sutures ; 

 fifteen to twenty blade-like ribs disposed longitudinally on the 

 surface; apei'ture rounded, canal slightly turned to the left. 



Length 43, diam. 20 mill. 



Massachusetts, northwards. 



Larger, with one more Avhorl than T. truncatus. 



3. T. MURiCATUS, Montagu. Fig. 41. 



(3Iurex.) Test. Brit. 263, t. 9, f. 3. 



Shell small, yellowish or white; whorls seven, very convex; 



with ten conspicuous ribs crossed by elevated revolving lines, 



canal long and straight. 



Length 17, diam. 7 mill. 



Massachusetts, Europe. 



Family BUCCIXID^E. 



Shell notched in front; or with the canal abruptly reflected, 

 producing a kind of varix on the front of the shell. Carnivorous. 



Synopsis of Oenera. 

 Shell ovate, few-wliorled, with a corneous epidermis ; whorls ventricose ; 

 aperture large, oval, emarginate in front ; canal wide, truncated, dorsally 



