ODOSTOMIA. 287 



above the middle of the inner hp. There is no true umhi- 

 lical perforation, but at most a mere chink. Few exam- 

 ples measure quite two lines in length, and three-quarters 

 of a line in basal diameter. 



The variety which forms the 0. turrita of Alder (not 

 Hanley) is slightly more produced and cylindrical, and has 

 the two lips a little straighter in consequence. 



The shell is stated by Mr. Jeffreys to be found in the 

 following localities : Guernsey ; Torquay ; Tynemouth and 

 Cullercoats in Northumberland ; Lerwick, Oban, and else- 

 where on the west coast of Scotland ; Roundstone in 

 Gal way. 



0. cYLiNDRFCA, Alder. 



Almost cylindrical, smooth, but with an obscure spiral ridge 

 or two running in a line with the upper corner of the aperture ; 

 whorls more or less rounded, yet often subscalar, deeply divided, 

 the penult high ; body short ; apex peculiarly blunt ; fold obso- 

 lete : no umbilical crevice. 



Plate XCVI fig. 7. 



Turbo 7iivnsus, Mont. Test. Brit. vol. ii. p. 326, from type. — Maton and Rack. 



Trans. Linn. Soc. vol. viii. p. 163. — Turt. Concli. Diction. 



p. 202. — Fleming, Brit. Animals, p. 300. — Brit. Marine 



Conch, p. 171. — DiLLW. Recent Shells, vol. ii. p. 839. — Wood, 



Index Test. pi. 31, f. 56. 

 Odoslomia cylindrica. Alder, Ann. Nat. Hist. vol. xiii. p. 327, pi. 8, f. 14. — 



Jeffreys, Ann. Nat. Hist, new ser. vol. ii. p. 339. 

 Cinc/ula nivosa, Brit. Marine Conch, p. xliii. 

 Pyramis nivosus. Brown, 111. Conch. G. B. p. 14, pi. 9, f. 25, 26. 



Actual comparison of the solitary type of Montagu in 

 the British Museum, with characteristic specimens of the 

 O. cylindrica kindly sent us by Mr. Alder, enable us to 

 positively assert the identity of the two shells. So brief 

 and inadequate was the description of the earlier writer, 

 (who did not descry the more important features) that it 



