CHEMNITZIA. 435 



like Ch. pusilla, and the tentacula are carried more in a line 

 with the body than in that species ; the shell is also more taper 

 and of a more opake, sordid texture, but recent examples must 

 be compared to see the value of this distinction. 



This is the first year I have succeeded in obtaining live 

 examples, which occurred in the littoral zone off Budleigh 

 Salterton, where in former years I have taken abundance of 

 fresh, excellent shells, but always without the inhabitant. 

 The existing malacological notes on this animal are so meagre, 

 that the present account may almost be considered as that of 

 an unrecorded creature. 



CH. PUSILLA, Philippi. 



Ch. elegantissima, var. pusilla, Anglorum, et Brit. Moll. iii. p. 243, 

 and iv. p. 275. 



A single live specimen of this very distinct species has 

 occurred, which enables me, more decisively than any of its 

 congeners, to insist on the position, that the eyes and tenta- 

 cula are planted across the rostrum, which is an undoubted 

 continuation of the neck. What has led to the idea that the 

 so-called mentum belongs to the foot, is, that the pedal union 

 with the general body of the animal is in this tribe a little 

 more anteally advanced than in the RISSO& of similar propor- 

 tions, thus giving the neck, and its sequence the rostrum, an 

 apparent connection with the foot, which, if organically viewed, 

 it does not really possess. 



It will only be necessary to notice the variations of the 

 C. piisilla from its more stately congener the C. elegantissima. 

 It is, as respects the shell, not half the size, is much more tumid, 

 and does not taper in the decided manner of an example of 

 that species of similar size. The variations of the malacology 

 are more pronounced : the foot is much longer, extending on 

 the march to the third basal volution, and terminating in 

 almost a needle point ; whilst in the other, in a similar con- 

 dition, it is quite rounded, and does not reach beyond the 

 body- whorl. In the "pusilla," the tentacula when spread 

 have the membranes united almost to the extremities, which 

 are minute and pointed, so that they appear in action as a single 



2 F2 



