ACADEMY OF NATURAL SCIENCES. 117 



Shell with a covered or open umbilicus, turbinately depressly globose, whorls 

 5 a little convex, the last descending ; suture well impressed ; transverse striae 

 well and densely shown, longitudinal strias fine and impressed ; aperture rounded ; 

 peristome various (thin, acute, a little reflected, or heavy, with an interior 

 thickening) approximate, with (or without) a profuse callus connecting the 

 outer and inner lips ; near the umbilicus the columellar lip expands so as to par- 

 tially cover the perforation. 



Hab. San Clemente Island, Cal. Abundant. 



This shell, so difficult to describe, owing to its variable characters in different 

 specimens, makes the nearest approach to H. Kelletii Forbes, from which it may 

 readily be distinguished by its sculpture and other characters. In size and the 

 elevation of the spire, it is one of the most variable of the California species 

 of Helix. Distinguished from H. intercisa W. G. Binney, by its not being 

 solid, having the umbilicus partially or completely open, and from the figure 

 referred to, in being more depressly trochiform in shape. The locality of H. 

 intercisa is given as " Oregon Territory." The shell varies in some minor par- 

 ticulars, as in the want of a rufous apex, and its not being of the same color ; 

 in other respects it seems to be a closely allied species. 



Helix rufocincta Newc. State Collection, Species 624. 



H. testa depresso-globosa, cornea, rufo-unifasciata, umbilicata, sub-lente decus- 

 sata-striata ; anfr. 6 ultimus non descendens ; apertura sub-rotundo, labio reflexo, 

 albo ; sutura impressa ; columella non callosa. 



Diam. maj. 0.70, min. 0.60 pol. Alt. 0.40 pol. 



Hab. San Diego, et Insula " Santa Catalina," Cal. 



Shell depressly globose, horny, red-banded, umbilicate, under the lens decus- 

 sately striate ; wborls 6, the last not descending ; aperture sub-rotund ; Up 

 white, reflected ; suture impressed ; columella not callous. 



The adult of this species is allied in outline to H Pytyonesica Pfr., but is 

 less elevated, and bears in other respects no especial relation to that species. 

 The size varies considerably, and the umbilicus in some specimens is nearly 

 closed, while in the typical specimens it is quite open. 



But one dead specimen was found at San Diego ; but on Catalina Island it 

 was more common, 19 adult and mostly living specimens occurring, sestivating 

 on the under surface of stones, in June. 



Helix Gabbii Newc. State Collection, Species 1097. 



H. testa sub-obtecte umbilicata, tenuis, pallide cornea, depresso-orbicularis, 

 fusco obscure zonata ; anfr. 5 convexis ultimus descendens ; sutura bene im- 

 pressa ; apertura sub-orbiculari ; labro albo non calloso, reflexo. 



Diam. maj. 0.40, min. 0.35 pol. Alt. 0.20 pol. 



Hab. Insul. " San Clemente," Cal. 



Shell with umbilicus partially covered, thin, pale corneous, depressly orbicu- 

 lar, with an indistinct brown band ; whorls 5 convex, the last descending ; lip 

 white, not thickened, reflected. 



I have seen but a solitary specimen of this species. The size corresponds 

 nearly with H. facta, but the thinness of the shell, the color, the more rounded 



