420 PYEAMIDELLID^. 



rather stronger and broader than in that species. Habitat 

 amongst the masses of Annelida and other animals imbedded 

 in old oyster-shells from the coralline zone. 



CH. ACUTA, rnihi. 



Ch. acuta, mihi, Ann. Nat. Hist. N. S. vi. p. 452. 



Odostomia acuta, auct. et Brit. Moll. iii. p. 269, pi. 97. f. 8, 9. 



O. conspicua, Aider ? et Brit. Moll. iii. p. 263, pi. 95. f. 6. 



O. turrit a, nonnull. No figure. 



O. striolata, Alder ? et Brit. Moll. iii. p. 26?, pi. 95. f. 5. 



Animal inhabiting a glossy shell of 5-6 rounded volutions 

 of a more or less pale livid red, pinkish, or pearly hue ; the 

 apex is greatly reflexed, and the aperture furnished with a 

 conspicuous tooth. The ground colour of the animal is a 

 sordid white, mixed with clouded pale yellow, red, or brown 

 patches and points, which are irregularly distributed on many 

 of the organs ; the tissue of the skin is smooth, rarely frosted 

 or breaking into a mottled flaky aspect. The mantle is even, 

 except that at the upper angle of the aperture there is a very 

 evident folded tubular canal, which I have alluded to in the 

 preliminary observations on the genus. I will only add, Mr. 

 Lowe writes, "pallio ecanaliculato ;" M. Loven says, "pro- 

 cessus pallii dexter canaliculatus ;" from which it may be 

 inferred, that the canal is sometimes present, at others not, or 

 not visible. The rostrum is slender, deeply channeled, or 

 hollowed-out its whole length, having a cochleariform termi- 

 nation, and at the upper surface of its base emits the pro- 

 boscis. The tentacula are moderately long, divergent, sub- 

 triangular, bevelled, with the margins only slightly folded, 

 and the tips are less white and inflated than usual ; the eyes 

 are rather close at the internal angles. Foot short, opake- 

 white, often aspersed on both surfaces with the varying hues 

 I have spoken of above, deeply hollowed-out in front, forming 

 with the angles long auricles, which, when drawn together by 

 the animal, have the appearance of a second pair of tentacula. 

 Its posteal termination, at the will of the animal, assumes 

 the varying phases of the pointed and obtuse forms, carrying 

 at the junction of the foot with the body, on a simple emi- 



