104 AMERICAN JOURNAL 



outer lips are much fewer than in P. imbrieata, which is a much 

 longer, larger and more pyriform shell. P. phrygaia, beside its 

 totally different markings, has three times as many plicae, is 

 much thinner, more delicate, and much more pointed behind. 



I have obtained P. catenata, Phil., or a form entirely undis- 

 tinguishable from it, from Panama, Cape St. Lucas and the 

 Galapagos Islands. It is a common West Indian species. 



BUCCiNIME. 



Genus VOLUTHARPA, Fischer. 



Volutharpa, Fischer, Journ. de Conchyl. v, p. 85, 1856. 

 Bullia sp., Jay, Middendorf. 



1. Volutharpa ampullacea, Midd., Bull. Phys. Math. Acad. 



Sci. St. Petersb. vii, No. 16. Beitr., Mai. Rossica, p. 

 179, 1849. Sibirische Reise, Bd. ii, p. 237, pi. viii, f. 

 3, 4, xvii, f. 1—3, 1851. 



Volutharpa Deshayesiana, Fischer, Journ. de Conchyl. v, p. 



86, pi. iii, f. 8, 9. 1856. 

 Hab., South coast of the Ochotsk Sea, Mid. Plover Bay, 



Eastern Siberia, Dall. 



2. Volutharpa Perryi, Jay. 



Bullia Perryi, Jay, Perry's U. S. Japan Exp., vol. ii, p. 295, 



pi. v, f. 13—15, 1857. 

 Volutharpa Perryi, Moerch, Journ. de Conchyl. vii, p. 44, 



1858. 

 Hab., Bay of Yedo, Japan. 



3. Volutharpa ampullacea, var. acuminata, Dall. 



Shell with a sharper and longer apex than V. ampullacea; 

 last whorl less rounded above, columella much less arched, in 

 fact nearly straight, not concave in the middle and projecting 

 at the antorior end as in that species ; outer lip much less effuse 

 and canal much narrower. In the typical ampullacea the epi- 

 dermis is thin yellowish, and in perfect, fresh specimens covered 

 with minute, very short cilia, caused by the elevation of minute 

 threads of the epidermis at the intersection of the crowded fine 

 revolving stride which cover the whorl, with the lines of growth. 

 In some apparently perfect specimens, however, the epidermis 

 appears perfectly smooth and even polished. In the present 

 variety, however, the epidermis is much thicker and stronger, 

 almost pilose, though preserving the same general characters. 

 In both the suture is canaliculated. 



