Y4 AMERICAN MARINE CONCIIOLOGY. 



3. T. cosTTJLATA, Migliels 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 



nearl}'^ smooth, the others longitudinall}' plicate, with microscopic 



transverse stx'ife ; last whorl subcarinate; aperture rather less than 



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



Length lY, 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 hy its much more 



convex whorls and prominent ribs. The operculum appears not 



to be fimbriated at its edges. 



From fishes. 



Cape Cod to Qrand 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. 



Massachusetia Bay. 



This is a doubtful species. 



Genus VERMETXIS, Adanson. 

 Hist. Nat. Senegal, IGO. 1757. 



1. V. RADicuLA, Stimpson. Fig. 134. 



Shells of New England, 37. 1851. 

 V. himbricalis, 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. 



