CLASS GASTROPODA 
189 
whorls sloping above, truncated on the margin, nearly flat below; surface 
marked by numerous, finely granulated, revolving ribs; color yellowish- 
brown, banded by a variable number of spiral purple lines, interrupted by 
white spots; aperture subquadrate, nacreous within; inner lip heavy, outer 
lip and base acute, umbilicus white. (Gabb.) 
Type in California Geological Survey Cabinet, Mollusca, No. 602. 
Type locality, San Pedro, California. 
Range. Santa Cruz to San Diego, California. Fossil: Pleistocene, San 
Pedro to San Diego, California; Pliocene, San Pedro. 
Calliostoma gemmulatum Carpenter, 1864 
Supplementary Report, British Association for the Advancement of Science, 653. 
Tryon and Pilsbry, Manual of Conchology, 11:371; PI. 67, fig. 54. 
Very swollen; painted like eximium; with 2 principal and 2 smaller 
rows of granules. (Carpenter.) 
Shell conic-elevated, solid but rather thin, imperforate, greenish-olive, 
with narrow irregular longitudinal blackish-olive stripes. Whorls about 
seven, of a rounded form, separated by deep sutures, encircled by three 
principal granulose carinae, the base and interstices with smaller lirulae 
and regular incremental striae; whorls of the spire with two strong carinae. 
Base rather flattened, with about 10 concentric lirae, dotted with brown. 
Aperture rounded-quadrangular, iridescent; columella pearly, iridescent, 
not truncate below, bounded outside by a whitish-yellow streak. Alt., 17; 
diam., 14 mm. (Tryon and Pilsbry, Manual of Conchology.) 
Type in United States National Museum. Type locality, California. 
Range. San Pedro, California, to Gulf of California. 
Calliostoma supragranosum Carpenter, 1864 
Supplementary Report, British Association for the Advancement of Science, 653. 
Tryon and Pilsbry, Manual of Conchology, 11:369; PI. 67, fig. 71. 
Swollen, with sharp ribs; posterior 1-4 granular. (Carpenter.) 
Shell small, conical, rather thin, imperforate, light chestnut-brown with 
a few short subsutural white flames and a peripheral circle of alternating 
chestnut and white spots, the ribs of the base minutely articulated with 
chestnut white. The spire is conical, short, composed of five convex 
whorls, the apical one very minute, smooth, whitish; the next two whorls 
are encircled by two strong, articulated ribs; on the next whorl these be¬ 
come beaded, and smaller beaded riblets appear above them; the last whorl 
has four (or five) strong, elevated ribs around the middle, above them two 
or three beaded ribs; the base has nine fine, distinct, smooth, concentric 
[7911 
