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, æstivating 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 impressa; 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 orbicular, 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 whorls, the deeper suture, and the thin, white, reflected lip, sufficiently characterize this as a distinct species.
Helix facta Newc. State Collection, Species 1099.
H. testa obtecte rimata, depresso-orbiculari, solida, compacta, glabra, albida, fusco-rubro uni-zonata; anfr. 5 ad 5½ convexiusculi, ultimus descendens; sutura modice impressa; apertura ovalis; labro crasso, reflexo, flavido.