CLASS GASTROPODA 
231 
An oval shell with the two sides equally curved, the back regularly 
convex, not carinated at the row of perforations; outside covered with a 
thick black layer. Surface smooth, except for spiral lirae, which are 
sometimes wholly obsolete, and lines of growth. Spire low, near the 
margin. Inside smooth, silvery with red and green reflections; columellar 
plate not truncate below, sloping inward, its face concave; cavity of spire 
very small, almost concealed. Length (of average specimen), 112; width, 
85; convexity, 30 mm. (Tryon and Pilsbry, Manual of Conchology .) 
Type in British Museum. Type locality, California. 
Range. Coos Bay, Oregon, to Santa Rosalia, Lower California. 
Haliotis cracherodii holzneri Hemphill, 1907 
Transactions of the San Diego Society of Natural History, 1, No. 2, 4. 
I have before me three shells that, while they possess all the charac¬ 
teristics of Haliotis cracherodii, are without perforations, and there is no 
evidence on these shells that they ever had any holes. Thus they have lost 
the most important generic character that separates the genus Haliotis 
from that of the genus Gena , which has smaller but similar shells in every 
respect except the perforations, which are absent. 
The shells are unusually high and arching, as well as narrow and 
oblong, with the spire much pearer the posterior margin than in any 
other specimens of H. cracherodii that I have examined of the same size. 
Length of largest specimen, M/ 2 ; width, Z l /i ; height, \Y\ in. (Hemphill.) 
Type in the Frank Holzner Collection, San Diego. Type locality, 
Lower California. 
Range. San Pedro, California, to Lower California. 
Haliotis cracherodii splendidula Williamson, 1892 
Proceedings of the United States National Museum, 15:198. 
A number of shells, found at one time, at Point Vincent, have brilliant 
blotches of color in their interior somewhat like H. fulgens. Some have 
spots of brown color. (Williamson.) 
Type in Williamson Collection, Los Angeles Museum, Exposition 
Park. Type locality, Point Vincent, California. 
Range. Known only from type locality. 
Haliotis cracherodii imperforata Dali, 1919 
Proceedings of the United States National Museum, 56:370. Bulletin 112, United 
States National Museum, PI. 21. 
In The Nautilus for December 1910 (p. 96), I described a unique form 
of this species which is entirely imperforate, never having had any per- 
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