. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. MUSEUM OF COMPARATIVE ZOOLOGY. 195 In size, shape, and general appearance it somewhat resembles Istkviia, yet lacks tlie rib-like striation ; the lamellae would be typical for Vertigo and some of the smaller Pupca but for the presence of the well developed supra-apertural which P. Clementina has in common with P. calamitosa, Pilsbry, and Hemphilli, Sterki; but, on the other hand, there is notiiing of the characteristic palatal or gular folds of these two species. Thus, in several regards, our form is an inter
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. MUSEUM OF COMPARATIVE ZOOLOGY. 195 In size, shape, and general appearance it somewhat resembles Istkviia, yet lacks tlie rib-like striation ; the lamellae would be typical for Vertigo and some of the smaller Pupca but for the presence of the well developed supra-apertural which P. Clementina has in common with P. calamitosa, Pilsbry, and Hemphilli, Sterki; but, on the other hand, there is notiiing of the characteristic palatal or gular folds of these two species. Thus, in several regards, our form is an intermediate and connecting one between different groups, and consequently deserves our special interest. Pupa Clementina, Sterki, The Nautilus, Vol. IV. No. 4, Plate I. Fig. 4, August, 1890. The above is a copy of Sterki's original description and figure. Pupa Dalliana, Sterki. Shell conic or ovate-conic, of greenish horn-color, transparent, finely irregularly striate in the lines of growth, polished; whorls 4^, well rounded, with deep suture rather rapidly increasing, the last occupying about f of altitude towards the aperture, somewhat ascending on the penultimate. Aperture lateral, somewhat oblique, subovate, with just percepti- bly flattened palatal margin ; margins , the ends pro- tracted ; peristome shortly but decidedly expanded, with a very fine thread-like lip near the margin, the same continuing as a very fine callus on the apertural wall inside of the line connecting the ends of the margins; palatal wall quite simple; no lamellas. Alt. , diam. 1-^ '"'^^- Papa Dalliana. This form has been collected by Mr. Hemphill near Clear Lake, Lake Co., Cal., and I propose to name it in honor of Mr. William H. Dall. The specimens before me were fifteen, fresh, remarkably uniform in their whole appear- ance; all were more or less covered with a dark brown hard crust of slime and dirt, generally thickest around the aperture. Doubtless this coating is done " purp
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