112 Mr. W. Clark on the Chemnitzise. 



cartilaginous minute notched apophysis and obhque strise of the 

 tribe. 



The animal is not at all shy, progresses rapidly, and inhabits 

 the coralline zone at Budleigh Salterton, where we have taken it 

 in twelve fathoms water, more than once, ahve. The animal has 

 not been described. 



Chemnitzia elegantissima, Montagu. 

 Animal inhabiting a white spiral elongated glabrous shell of 

 12-16 costated volutions ; it is, except the eyes, hyaline-white 

 throughout. The produced rostrum, the ment um of some authors, 

 is on the upper surface deeply medially grooved, and at the ter- 

 mination imperforate ? there is at its clavate extremity a vertical, 

 and a little below a linear transverse deeply impressed line, both 

 having the appearance of a breach of continuity, though perhaps 

 not really so. I mention these circumstances in this species to 

 excite attention, as they are more developed than in such of its 

 congeners as I have examined. The rostrum is conspicuously 

 carried before the foot on the march, when it appears truncate, 

 but at rest is rounded and sinuated as in C. pallida. The foot is 

 also truncate, very slightly auricled ; the upper flap-skin or real 

 mentum does not reach to its margin ; it is narrow, not very 

 long, attenuates and tapers to a rounded broad extremity, car- 

 rying at a short distance therefrom, on an obsolete lobe, a 

 narrowish pear-shaped obliquely striated corneous operculum 

 that has a subelastic rectangular apophysis, not notched in the 

 centre, as the fold or denticle in this species is not usually 

 visible; but in those examples where it is more or less pro- 

 nounced, the notch is proportionately marked. The tentacula 

 are short, triangular and pointed, having large lateral mem- 

 branes which coalesce to half their altitude, and are capable of 

 assuming various shapes, as the auriform, the semitubular, and 

 longitudinal folds on the stamens, and of again being, as if ma- 

 gically, returned to a smooth, pointed, correctly bevelled, un- 

 folded, symmetrical condition, coalescing regularly at the bases ; 

 all these phases are effected by the will of the animal ; in short, 

 the tentacula in this creature have an arcuated, leaf-like, broadly 

 subtriangular aspect, scarcely showing inflations at the obtuse 

 tips; the eyes are at a little distance from the internal line of 

 the bases. 



This elongated animal of sixteen volutions differs in no essen- 

 tial point, and scarcely in specialties, from its pigmy congeners - 

 of three turns, whether they be smooth, costated, toothed, or 

 edentular ; emphatically pronouncing as impossible, on reasonable 

 grounds, a generic division of the family : all the species must, 

 I think, range as Chemnitzm. I have omitted to say, that the 

 mantle is even, plain, scarcely showing a trace of branchial cana- 



