350 Monograph of the Species of have heretofore thrown them away as worthless. But, on careful examination and comparison, 1 am persuaded it is dis-tinct from Littorina. The entire margin, and perfectly circu-lar aperture bring it nearer to Delphinula, if, indeed, it is not a species of that genus. Although I have not had an oppor-tunity to examine the animal inhabitant, nor even the opercle, I am constrained to separate it from Littorina, and place it under Delphinula, with a doubt, for the present. Art. XX VI IL — monograph OF THE SPECIES OF PUPA FOUND IN THE UNITED STATES : With Figures. By Augustus A. Gould, M. D. (Continued from Vol. III. p. 404.) In the preceding part of this paper I remarked, that there were two or three described species of the genus Pupa, which I had not then seen, or had failed to identify them with their descriptions. During the long interval which has since elapsed, through the kindness of my friends I have succeeded in obtaining all of them. These I shall now proceed to de-scribe, and also to communicate such facts respecting the spe-cies previously noticed, as a more extended observation has disclosed. PUPA OVATA. Plate XVI. figs. 7, 8. P. ovata, umbilicata, castanea ; anfractibus quinque, convexis ; aperlura subcor-data, dentibus 5 ad 9 lamellosis armat^, quorum 1-3 poslice, duo ad columellam, 2-5 ad labium inflexum adnatis. " Shell dextral, subovate, brown ; apex obtuse ; whorls five, glabrous ; suture not very deeply impressed ; body whorl in-dented near and upon the labrum ; aperture semioval ; labium five toothed, of which three are situate on the transverse por-tion of the lip, parallel to each other, equidistant, the superior and inferior ones being small, the latter sometimes obsolete, the intermediate one lamelliform, prominent, and the two other ones situate on tiie columella, approximate, extending
BioStor
