82 



PKOCEKDINGS OF THE MALACOLOGICAL SOCIEXT. 



It at once occiirrecl to me that I had recently somewhere noticed 

 figures much resemblin"; these, and a brief search soon revealed the 

 fact that during the " Blake " Expedition a very near ally of C. lissus 

 was obtained, which was described bj^ Dr. Dall under the name of 

 Amalthea hcnthophihi^^ and towards the close of this paper I propose 

 to touch upon this species also in fuller detail. 



There can be but little moral doubt but that this Western species is 

 a New World exponent of the Oriental C. lissus, and is congeneric with 

 it; and I am inclined to go even further than this, and to propose that 



the unusual smoothness of surface and want of radiating sculpture 

 are worthy of subgeneric distinction, as follows : — 



AMALTHEA, Schum. 

 Amalthea, SchuniRcher, Essai, pp. 56, 181, pi. xxi, fig. 4 (1817). 

 Mijppoiiyx, Defrance, Bulletin 8oc. Philom., p. 9 (1819). 



MALLUVIXJM,- nov. subgen. 



Ah Amalthea typica differt superficie omnino laevigata, interdum 

 alba, interdum longitudinaliter bi- vel tri-radiato colorata, radiis 

 cinnamomeis vel castaneis, apertura ovata vel circulari, intus albida, 

 mitrgine teniii, lamina basali tenui, vel, interdum, solida. 



Type : Cupulus lissus, E. A. Smith. 



Bull. Mus. Comp. Zool. Harvard Coll., xviii. No. 



figs. \a-b. 

 Malluviuiu, a basiu. 



29 ; pt. 2, p. 289, pi. xiv, 



