44 THE NAUTILUS. 



A NEW PUPA. 



BY DR. V. STEKKI, NEW rHILADELPIIIA, OHIO. 



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



Shell very minute, narrowly perforate, cylindrical, })ale horn 

 colored, transparent, with rather obtuse apex ; whorls 51, regularly 

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

 with few microscopic stria?, somewhat shining; last whorl occupying 

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

 aperture, with a slight, revolving inii:)ression on the middle of its 

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

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

 oblique, subovate with the palatal margin slightly flattened, upper 

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

 slightly thickened lip just at the margin; lamellie 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 

 jialatal margin ; columellar one typical, horizontal ; basal very 

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

 a little longer. 



Alt. 1-9, diam. 0-8 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- 

 niea, 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 tyj^ical for 

 Vertigo and some of the smaller Pujia, 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, thei*e 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. 



