1918] Packard: Molluscan Fauna from San Francisco Bay 307 
pery stains, pinkish within the spire; the muscle impression painted in a 
peculiar and brilliant pattern, like a peacock’s tail. Columellar plate wide, 
flat, sloping inward. Cavity of the spire small, almost concealed. Perforations 
rather small, elevated, cireular, about 5 in number.’’ 
This species is associated with the preceding species, according to 
Carpenter. Pilsbry (1890) apparently overlooked Carpenter’s cita- 
tion when he considered the range of the species. 
Range.—Farallon Islands (Carpenter), Monterey to Lower Cali- 
fornia (Pilsbry). 
Haliotis assimilis Dall 
Haliotis assimilis Dall (1878a), p. 46; Pilsbry (1890), p. 83, pl. 22, fig. 29; 
Blankinship and Keeler (1892), p. 151. 
Description.—This species was defined by Pilsbry (1890) as follows: 
‘*Shell short, oval, very convex, the spire short but projecting above the 
general outline of the back; surface spirally lirate and having low, rather 
obscure radiating waves; perforations five; inside silvery, with red, blue, and 
green reflections. 
‘‘The form is the same as in H. corrugata, except that the spire is more 
produced in the present species. It is solid and strong, but not very thick. 
The epidermis is dull reddish and greenish. Surface sculptured by numerous 
spiral cords, alternately larger and smaller, and obsoletely waved radiately. 
Below the row of holes is a shallow channel; the area between the row of holes 
and the columellar margin is spirally lirate, and has an obtuse carina in the 
middle. Inside light, nacre silvery, red and green; the muscle impression 
smooth . . . columellar plate rather narrow, not at all truncated below, sloping 
inward.’’ 
The only record of this species occurring north of Monterey is that 
of Blankinship and Keeler’s list of species from the Farallon Islands. 
Range—Farallon Islands; Monterey to San Diego, California 
(Campbell). 
FISSURELLIDAE 
Fissuridea Swainson 
Fissuridea aspera (Eschscholtz) 
Plate 34, figures 2a and 2b 
Fissurella aspera Eschscholtz (1829-1833), p. 21, pl. 23, fig. 5. 
Glyphis aspera, Pilsbry (1890), p. 214, pl. 36, figs. 28, 29, 30; Wood and 
Raymond (1891), p. 57. 
Fissuridae aspera, Arnold, R. (1903), p. 338. 
Description.—Pilsbry (1890) describes this species as follows: 
“*Shell ovate, narrower in front, conical, the slopes nearly straight or a 
little convex behind the middle. Sculptured with numerous radiating riblets, 
of which 30-34 are larger, the intervals between them bearing about three 
smaller ones; the whole decussated by close elevated concentric lirae, which 
are more or less scale-like and imbricating. 
