OUOSTOMIA. 



327 



Fig. 695. 



Odostomia dealbata. 



Chemnitzia dealbata, Stimpson, Proc. Boit. Soc. iv. lU (1851); Shells of New Eng- 

 land, 41. 

 Odostomia dealbata, Stimpson, Check Lists, 5. 



Shell ovate-conic, white, smooth, pellucid ; whorls six, 

 rather convex ; aperture ovate, hardly effuse ; furnished 

 with a small inconspicuous fold. Length, seventeen 

 hundredths of an inch ; breadth, six and a half hun- 

 dredths of an inch. 



It is broader than O. bisuturalis, but has not so 

 sharp an apex, and wants the revolving line ; dredged 

 in Boston Harbor, three fathoms, on a shelly bottom 

 (^Stimpson). 



Odostomia modesta. 



Chemnitzia modesta, Stimpson, Proc. Bo=;t. Soc. iv. IG ; Shells of New England, 41. 

 Odostomia modesta, Stimpson, Check Lists, 5. 



O. dealbata. 



Shell small, conic, white, smooth ; whorls four, flattened, 

 the last medially sub-angulated ; suture impressed ; aper- 

 ture uniplicate, sub-rhomboid. Length, fourteen hundredths 

 of an inch; breadth, six hundredths of an inch. 



This species is more angular than O. bisuturalis, and 

 has no revolving line just below the suture, as in that 

 shell. It is very like the British O. iinidcntata. It in- 

 habits the Coralline Zone, at St. George's Banks (^Stimpson). 



596. 



Odostomia bisuturalis. 



EiG. 177. 



Shell small, ovate-conical, smooth, whitish ; with a single revolving line below 

 the suture; aperture oval, sub-umbilieated. 



Jaminia e.rigua, Coutiiouy, Bost. Journ. Nat. Hist. ii. 92, pi. 2, fig. 7 (18.38). — Kijs- 



TER, 59, pi. 10, figs. 25, 26. 

 Odostomia exir/ua, Gould, Inv. 1st ed. 272, fig. 77. — Stimpson, Check Lists, 5. 

 Risson rupesfris, Forises, Ann. of Nat. Hist. ii. 107, pi. 2, fig. 13. 

 Turritella bisuturalis. Say, Journ. Acad. Nat. Sc. ii. 244 (1821). 

 Chemnitzia bisuturalis, Stimpson, Shells of New England, 42. 



Shell small, ovate-conical, somewhat turreted, rather obtuse at 

 apex, surface smooth, light green, under a brownish epidermis, 



