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 appro.ximate, 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. 1.2, 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 

 " purposely " by the animals, as in many other species also. When cleaned, it 

 shows about the size and shape of a well grown Vertigo ovata. Say ; but by a good 

 eye, or under a glass, is at once recognized as something else, by the rounded 

 aperture and the absence of lamellfe. (Sterki.) 



Pupa Dalliana, Sterki, The Nautilus, Vol. IV. No. 2, p. 19, June, 1890. 



Dr. Sterki's description is copied above. My figure was drawn by him from 

 the type. 



Pupa syngenes, Pilsbrt. 



Shell subcylindrical but wider above, composed of eight narrow, convex whorls, 

 sinistralli/ convoluted : texture as in P. muscorum, but color rather ligiiter brown. 

 Last whorl ascending, imperforate, bearing a strong high crest just behind the 



