Toniatcllidfe, and PyramidellidEe. 453 



predated, operculigerous lobe. The head is proboscidiform, 

 marked with minute lead-colour blotches. Tentacula nearly 

 conjunctive at the bases, short, broad, awl-shaped, but not 

 pointed, setose ; eyes close together at their internal angles, not 

 on, but between them, not raised, but fixed on the surface skin ; 

 the tentacula have an intense white longitudinal line in the cen- 

 tre of each. To describe further would only be to repeat our 

 notes on C. eulimoides. It is rare at Exmouth, and inhabits the 

 coralline zone. 



Chemnitzia unidentata. 



Turbo unideiitatas, Montagu. 



Animal spiral, bluish hyaline white ; mantle even with the 

 shell; head proboscidiform, occasionally extended beyond the foot, 

 bearing short, broad, awl-shaped, setose blunt tentacula, w^hich 

 have a fine transparent line through their centres ; the eyes are 

 within the internal bases, close together, not raised, fixed on the 

 connecting membrane. The foot is short, truncate, slightly 

 eared, but not in the least emarginate in fi'ont as in Chemnitzia 

 acuta, or even hollovv^ed out like that of C. eulimoides, rounded 

 posteriorly, sloping to a broad obtuse lance-shaped terminus, 

 and has on the posterior upper surface of a scarcely perceptible 

 operculigerous lobe, a light corneous, suboval, simply striated 

 operculum. The anterior portion of the sole of the foot is flake- 

 white, the posterior hyaline, with a fine longitudinal line only in 

 the centre of that part. The sole of the foot is divided from the 

 upper pedal disk by a shallow groove, giving the foot a labiated 

 aspect. 



This species differs little from C. acuta; the foot not being 

 emarginate is the principal distinction, and the tentacula are 

 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. 



Chemnitzia conoidea. 

 Odostomia conoidea, nonnull. 

 Animal inhabiting a spiral shell of eight volutions, hyaline 

 bluish white throughout, slightly shot with flake-white cloudy 

 matter ; mantle plain ; head, a proboscidiform cloven muzzle re- 

 presenting a second pair of short tentacula ; mouth at the termi- 

 nation of the scission ; the true tentacula are subtriangular, flat, 

 bevelled, not very short, rounded at the tips, slightly setose ; the 

 eyes are very black, situated exactly at the internal bases of the 

 tentacula immersed in the skin, and so close to each other that a 

 hair can scarcely be laid between them ; I never saw the eyes so 

 contiguous in any other molluscum. Foot large, rather long. 



