CLASS GASTROPODA 
171 
Type in State Collection, Species 1006. Type locality, Catalina Island, 
California. 
Range. Monterey to Catalina Island, California. 
Subgenus Arene H. and A. Adams, 1854 
Liotia cookeana Dali, 1918 
Plate 91, figs. 12, 13, 15 
Proceedings of the Biological Society of Washington , 31:8. 
Shell small, white depressed, with a narrow crenulated suture and 
three rapidly enlarging stellate whorls; axial sculpture of (on the last 
whorl 13) pronounced barrow ribs with wider interspaces, acutely pro¬ 
duced at the periphery, and extending nearly to the crenate margin of the 
funiculate umbilicus; the whole surface in addition is covered with fine, 
close-set, sharp, almost microscopic, axial threads; beyond the periphery 
are four or five spiral cords which do not appear on the ribs; aperture 
circular, the margin crenated by the sculpture. Breadth of shell, 3 ; height, 
1 mm. (Dali.) 
Type in United States National Museum, No. 223290. Type locality, 
of? South Coronado Island. 
Range. South Coronado Island to Gulf of California. 
Genus MOLLERIA Jeffreys, 1865 
Shell remarkably solid, with strong and partly dichotomous transverse 
ribs; peristome continuous. Operculum calcareous, multispiral. (Tryon 
and Pilsbry, Manual of Conchology.) 
Type. Molleria costulata Moiler. 
Distribution. Europe and west coast of North America. 
Molleria quadrae Dali, 1897 
Plate 91, figs. II, 16 
Bulletin, Natural History Society of British Columbia, No. 2, 14; PI. 1, fig. 14. 
Shell small, solid, straw-colored or brownish, with three, rapidly 
enlarging, well-rounded whorls; spire depressed, suture very distinct, 
umbilicus narrow and deep; surface microscopically spirally striate, the 
sculpture coarser on the base, but visible with a lens on the upper surface 
also; aperture circular, peritreme continuous, simple; operculum multi- 
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