74 AMERICAN MARINE CONCIIOLOGY. 



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 



nearlj' smooth, the others longitudinally plicate, with microscopic 



transverse strire; last whorl subcarinate; aperture rather less than 



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



Length 17, diam. 6. mill. 



Citsco 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 Inland. 



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 VERMETUS, 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. 



