103 
periphery this sculpturing becomes much modified, and disappears 
near the umbilicus. The suture is distinct and well impressed; 
aperture, subcircular and large; peristome simple, very slightly re- 
flected, its ends approaching the basal or columellar end, crowding 
and half covering the rather small umbilicus. 
Great diam., 26; height 20 mm. 
Great diam., 25; height 18 mm. 
Great diam., 20; height 14 mm. 
A very elevated shell measures : 
Great diam., 20; height 20 mm. 
Two depressed shells measure : 
a 
Great diam., 23; height 19 mim. 
Two small shells measure: 
Great diam., 19; height 15145 mm. 
Great diam., 18; height 14% mm. 
Habitat, San Luis Obispo, Cal. 
HELIX VAR. MORROENSIS, HEMPH. 
This variety of walkeriana differs from the typical form, in hav- 
ing the revolving grooves obsolete, or extremely faint, and more pro- 
fusely granular. 
Great diam., 29; height 18 mm. 
Great diam., 22; height 16 mm. 
Great diam., 18; height 15 mm. 
Habitat, San Luis Obispo County, Cal., among brush and rocks. 
This shell and its variety are extremely interesting forms, when 
one reads and interprets their combinations of characters intelligently. 
It combines the form, file-like striae of growth, open umbilicus and 
general aspect of Helix ramentosa Gld., with the glaubose (not typical 
form), open umbilicus, file-like striae of growth, and the revolving 
erooves of the typical H. ayresiana Newe. 
I dedicate this shell to Mr. Bryant Walker in recognition of his 
valuable services in the study of conchology. 
CIRCINARIA VAR. KELSEYI, HEMPH. 
Shell umbilicated, greatly elevated, of a yellowish horn-color; 
whorls about 5 convex above and below, gradually enlarging, the 
last sloping rapidly to the periphery; spire greatly elevated, with a 
medium pointed apex; striae of growth oblique, rather fine; suture 
distinet but not very deeply impressed; aperture somewhat effuse, 
roundly oval; peristome simple, a little thickened, outlined by a rim 
of dark brown epidermis, the ends approaching and joined by a thin 
parietal callus; umbilicus deep and quite narrow. 
