104 
Great diam., 15; height 12 mm. 
Great diam., 16; height 9 mm. 
Great diam., 17; height 10 mm. 
Plate 3—Circinaria var. kelseyi—Hemphill. (Natural size.) 
Habitat of the most elevated shell, San Mateo County. 
Habitat of the other two shells, San Luis Obispo County, Cal. 
I dedicate this variety of Prof. F. W. Kelsey of San Diego, Cal., 
who has taken much interest in the study of shells, and whose photo- 
graphs of shells are nearly perfect. 
HELIX VAR. AVALONENSIS, HEMPH. 
Shell sub-lenticular, deeply unbileated, whitish horn-color. 
Whorls 5 or 515, flatly convex above, more rounded beneath, with a 
sharp carina at the periphery, which becomes obsolete on the last half 
of the body-whorl of the single mature shell that I have. The seulp- 
turing, under a strong pocket lens, on the nuclear whorls, consists of 
fine rib-like striae of growth, regular in form and arrangement, that 
after two or three turns become obsolete and are superseded on the 
following whorls by very small revolying granular riblets, one of 
which rapidly develops into a sub-carina with the aid of the pinch 
of the peripheral carina, making the shell bicarinate as in Helix hemp- 
hilh, Newe. The revolving riblets above and beneath vary consider- 
ably in streneth, number and arrangement. 
The whole surface of the shell, except the nuclear turns, is cov- 
ered with fine, sharp striae of growth, and rather rough indentations 
that divide the surface of the shell into irregular sections. Beneath 
the surface is smoother, but under a strong pocket lens, the sharp 
striae of growth and the revolving riblets give that portion of the 
shell the exact aspect of Helix haydeni, Gabb. The suture is distinet 
and well impressed and after three or four turns shows the upper 
part of the carina as a sutural riblet. 
The umbilicus is moderately broad and deep, and in very young 
shells, it is defined by a blunt carina, but does not appear in the adult 
shell. The peristome is simple and acute, its upper termination not 
falling. The aperture is nearly a complete circle, but in immature 
specimens its outer margin is made angular by the peripheral carina. 
