54 PROCEEDINGS OF THE NATIONAL, MUSEUM vol.89 



while the posterior portion of the inner lip slopes materially inward. 

 The surface of the inside is wavy and its color pearl-gray. 



The type, U.S.N.M. No. 535848, was collected by A. Sorensen in 

 8 to 10 fathoms off Cayucas, Calif. It measures: Height, 34 mm.; 

 greater diameter, 110 mm. ; lesser diameter, 85 mm. 



U.S.N.M. No. 535849 contains four additional specimens, which 

 range from a length of 53 mm. to almost the size of the type. These 

 came from 10 to 15 fathoms off the southern part of Monterey County, 

 Calif. Two others, U.S.N.M. No. 535850, came from off Port San 

 Luis Obispo, Calif. 



This species suggests slightly Haliotis kamischatkana but is much 

 broader than that. It reminds one also of H. assimilis, but its coarse 

 sculpture at once removes it from that association. 



HALIOTIS KAMTSCHATKANA Jonas 



1845. Haliotis kamtschatkana Jonas, Zeitschr. fiir Malak., vol. 2, p. 168. 



This narrow, rough species, with spire highly elevated, is repre- 

 sented in our collection by specimens taken at points ranging from 

 Alaska south to Monterey Bay. 



HALIOTIS SMITHSONI, new species 



PL&.TE 8, Figures 7-9 



Shell large, with a strongly mammillated spire, whose whorls are 

 separated by a rather deeply impressed suture. From the summit 

 to the row of siphonal apertures the whorls are almost straight, a 

 little convex on the last portion of the last turn. The siphonal 

 openings are craterlike, the last three or four being open. The 

 sculpture between the summit of the whorl and the siphonal line 

 consists of coarse incremental lines that develop into inconspicuous, 

 low, rounded ridges, which are almost regular in distribution; these 

 ridges bear obsolete, ill-defined nodules. In addition there are slen- 

 der spiral threads, which are of varying width and differ slightly in 

 spacing. Between the siphonal line and the edge of the aperture 

 there is a low, raised keel a little posterior to the median line. The 

 space between this rounded keel and the siphonal line is slightly con- 

 cave and marked by incremental lines and spiral threads. Anterior 

 to this submedian line the shell is slightly rounded and marked by the 

 continuation of the rugose radial threads referred to for the spire 

 and spiral threads. The aperture is oval and is sharp on the dextral 

 margin, while the left margin is moderately broad and slopingly 

 excavated. This slope extends over the parietal wall, where it is a 

 little broader. The muscle scar is rather pronounced. The color 



