422 PYEAMIDELLKLE. 



forms, each differs greatly in the contour and colour of its 

 individuals; it is, after the C. pallida, the most variable of 

 the Chemnitzia. 



CH. CONOIDEA, Brocchi. 

 Odostomia conoidea, Brit. Moll. iii. p. 260, pi. 95. f. 4. 



Animal inhabiting a spiral shell of eight volutions, hyaline 

 bluish- white throughout, slightly shot with flake- white cloudy 

 matter ; mantle plain. Rostrum deeply emarginate, forming 

 two minute leaves turning to the right and left, with a 

 narrow depressed line dividing them in the centre, as far as 

 the eyes ; they almost represent a second pair of tentacula. 

 Proboscidal orifice at the termination of the groove close 

 under the eyes. In some specimens the scission of the 

 rostrum nearly extends to the eyes. 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 mollusk. Foot large, rather long, membranous, gently 

 reflected at the sides on itself, which reflexion it in some 

 measure retains on the march, deeply arcuated in front, 

 causing the auricles to be pointed, and gradually tapering 

 to a subtriangular termination. The usual operculum of 

 the tribe is carried on a simple lobe in an advanced position 

 nearly at the junction of the foot with the body. The animal 

 is vivacious, displays the eyes on the march, and makes rapid 

 progression ; it is only obtained at Exmouth in the coralline 

 zone, and is rare. 



A splendid series of all sizes of this beautiful species has 

 been examined, and I have little more to observe, except that 

 I find it has a slender and tumid variety. 



CH. RUFA, Philippi. 



Ch. rufa, Brit. Moll. iii. p. 245, pi. 93. f. 3. 



Ch.formosa, Brit. Moll. iii. p. 248, pi. 93. f. 5, and iv. p. 274. 



Animal inhabiting a shell of fourteen flat plicated volutions 



