ODOSTOMIA. 



327 



O. dealbala. 



Odostomia dealbata. 



Cliemnitz'ia dmlbata, Stimpson, Proc. Bost. Soc. iv. 114 (1851); Shells of New Eng- 

 land, 41. 

 Odostomia dealbata, Stimpsox, Ciieck Lists, 5. Fig. 595. 



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. 16 ; Shells of New England, 41. 

 Odostomia modesta, Stimpson, Check Lists, 5. 



Shell small, conic, white, smooth ; whorls four, flattened. Fig. 598. 

 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 o.^des- 

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

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



Odostomia bisuturalis. 



Fig. 177. 



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

 the suture ; aperture oval, sub-umbilicated. 



Jaminia exiijua, Couthouy, Best. Joum. Nat. Hist. ii. 92, pi. 2, fig. 7 (1838). — Kijs- 



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

 Odostomia exlgua, Gould, Inv. 1st cd. 272, fig. 77. — Stimpson, Check Lists, 5. 

 Rissoa rnprstris, Forbes, Ann. of Nat. Hist. ii. 107, pi. 2, fig. 1.3. 

 Turritella bisuturalis. Sat, Journ. Ac;ul. Nat. Sc. ii. 244 (1821). 

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



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

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



