300 University of California Publications in Zoology (Vou. 14 
Cryptochiton Middendorff 
Cryptochiton stelleri (Middendorff) 
Chiton stelleri Middendorff (1847-1849), p. 116. 
Chiton (Cryptochiton) stelleri, Middendorff (1847), p. 93, pl. 1, figs. 1, 2. 
Cryptochiton stelleri, Carpenter (1863), p. 648; Wood and Raymond (1891), 
p- 58; Pilsbry (1892-1893), p. 48, pl. 7, figs. 7-13, pl. 6, fig. 6. 
Description.—Pilsbry (1893) described this species as follows: 
“‘Oblong, rather depressed, the bilobed posterior outlines of the valyes (in 
dry specimens) showing through the leathery integument, which completely 
covers the valves. Color a dull ferruginous or brick-red, very well preserved 
specimens being rendered much brighter by the closely placed fascicles of 
brilliant vermilion spines. 
“‘The valves are wholly concealed, white or flesh-colored, entirely lacking 
the outer colored layer (tegumentum) of other chitons; their edges are more or 
less thinned and crenulated by radial striae. Anterior valve having the apex 
at the posterior third, and with 4 to 7 slits. Intermediate valves having the 
apex near the posterior third; formed of two large anterior lobes expanded at 
the sides, and two smaller, narrow posterior lobes. Posterior valve having the 
mucro posterior or near the posterior third; deeply sinused in the rear, and 
usually having a slit on each side of the sinus. 
‘*Girdle leathery, thick, red, densely covered with countless minute fascicles 
of vermilion spinelets.’’ 
This common chiton occurs outside the Golden Gate, but as far 
as is known it has not been found within San Francisco Bay. It 
appears to be most abundant just below the low-tide line. 
Range.—North Japan to Santa Barbara, California (Pilsbry). 
GASTROPODA 
ACMAEIDAE 
Acmaea Eschscholtz 
Acmaea asmi (Middendorff) 
Patella asmi Middendorff (1847-49), p. 39, pl. 1, fig. 5. 
Acmaea asmi, Carpenter (1863), p. 650; Pilsbry (1891), p. 19, pl. 6, figs. 
38-39. 
Description—This species is described by Pilsbry (1891) as follows: 
“‘Shell small, thin but strong and solid, elevated, conical, the base short- 
oval, apex erect, a little in front of the middle; slopes of the cone somewhat 
convex. Surface lusterless, usually corroded, smooth except for very fine 
radiating striae visible with the aid of a lens, but obsolete in adult shells. 
Color rusty black. 
“‘Tnside black, with a brown zone just outside the muscle-scar.’’ 
Carpenter (1863, p. 650) reported this species from the Farallon 
Islands, and San Francisco. It has not been recognized in the Survey 
collections. . 
Range.—Aleutian Islands, Alaska, to Turtle Bay, Lower California. 
