74 AMERICAN MARINE CONCHOLOGY. 



3. T. COSTULATA, Mighels and Adams. Fig. 132. 



Bost. Journ. Nat. Hist., iv. 50, t. 4, f. 20. 1842. 



Shell whitish, translucent ; whorls nine or ten, nearly flat or 

 very slightly convex ; suture well impressed ; last two whorls 

 nearly smooth, the others longitudinally plicate, with microscopic 

 transverse striae; last whorl subcarinate; aperture rather less than 

 one-fourth the length of the shell, subovate, produced anteriorly; 



Length IT, diam. 6. mill. 



Casco Bay. 



4. T. ACICULA, Stimpson. Fig. 133. 



Bost. Proc., iv. 15. 1851. 



Shell small, turreted, subulate, white, thin ; whorls ten, very 

 convex, longitudinally striate and transversely ribbed ; aperture 

 rounded, effuse anteriorly ; peristome acute. 



Length 5, diam. 1.5 mill. 



Distinguished from the young of T. erosa by its much more 

 convex whorls and prominent ribs. The operculum appears not 

 to be fimbriated at its edges. 



From fishes. 



Cape Cod to Grand Manan Island. 



5. T. AREOLATA, Stimpson. 



Shells of New England, 35. 1851. 



Shell small, subperforated, turreted, red, with four distant re- 

 volving elevated ribs ; aperture effuse in front ; lip acute ; whorls 

 six, convex. 



Length 5, diam. 2.5 mill. 



Probably a young shell, but appears distinct from any of our 

 species. Approaches T. reticulata, but the transverse ribs are 

 more prominent, and the longitudinal ones less so than in that 

 shell. Fifteen to fifty fathoms. 



Massachusetts Bay, 



This is a doubtful species. 



Genus VEEMETTJS, Adanson. 

 Hist. Nat. Senegal, 160. 1757. 



1. V. RADICULA, Stimpson. Fig. 134. 



Shells of New England, 37. 1851. 

 V. lumbricalis, Gould (not Lamarck), Invert. Mass., edit. i. 1841. 



Shell conic tubular, with numerous unequal raised lines or ribs 

 along its entire length ; the spiral portion consists of eight or ten 

 closely revolving whorls, biangulate. 



