44 THE NAUTILUS. 



A NEW PUPA. 



BY DR. V. STERKI, NEW PHILADELPHIA, OHIO. 



Pupa Clementina, sp. nov. (Plate 1, figure 4.) 



Shell very minute, narrowly perforate, cylindrical, pale horn 

 colored, transparent, with rather obtuse apex ; whorls 5j, regularly 

 increasing, moderately rounded, with rather deep suture, smooth, 

 with few microscopic strise, somewhat shining ; last whorl occupying 

 rather more than two-fifths of altit., somewhat ascending to the 

 aperture, with a slight, revolving impression on the middle of its 

 last J, ending at the auricle ; a very slight, flat, crest-elevation near 

 the margin, only in the lower part ; aperture lateral, scarcely 

 oblique, subovate Avith the palatal margin slightly flattened, upper 

 part of same somewhat sinuous, peristome a little expanded with a 

 slightly thickened lip just at the margin; laraellpe 6, white: two 

 on the apertural wall, the apertural, typical, and a rather long 

 supra-apertural, ending in a callus at the upper termination of the 

 palatal margin ; columellar one typical, horizontal ; basal very 

 small, nodule-like, deep seated ; palatals two, typical, the inferior 

 a little longer. 



Alt. 1*9, diam. OS mill. ; apert. : alt. 6, diam. 0"5. 



Three examples of this species were collected by Mr. H. Hemphill 

 on San Clemente Island, California, among numerous P. califor- 

 nica, Row. All were exactly alike, well formed and fully mature. 

 They cannot be referred to any one of our species published, and 

 doubtless represent a form of their own, although so far it was not 

 possible to examine the soft parts. 



In size, shape and general appearance it somewhat resembles Isth- 

 mia, yet lacks the rib-like striation ; the lamellae would be typical for 

 Vertigo and some of the smaller Pujia, but for the presence of the 

 Avell-developed supra-apertural which P. Clementina has in common 

 with P. caknnitosa Pilsbry and hemphilli Sterki ; but on the other 

 hand, there is nothing of the characteristic palatal, or gular folds 

 of these two species. Thus, in several regards, our form is an inter- 

 mediate and connecting one between different groups, and con- 

 sequently deserves our special interest. 



