CLASS GASTROPODA 
41 
axis; operculum normal, pale brown. Long, of shell, 22.5; of spire with¬ 
out the nucleus, 7; max. lat. of shell, 9 mm. (Dali.) 
Types in United States National Museum, Nos, 109044 and 109045. 
Type locality, U.S.S. “Albatross” Station 3343, off Destruction Island, 
Washington. 
Range. Straits of Juan de Fuca to San Diego, California, and off 
Pledras Blancas, Lower California. 
Trophon kamchatkanus Dali, 1902 
Plate 30, fig. 10 
Proceedings of the United States National Museum, 24:541. Bulletin 112, United 
States National Museum; PL 10, fig. 7. 
Shell small, solid, yellowish-white, with about five whorls; nucleus lost; 
subsequent whorls (on the fifth twenty-one) low, rude, riblike varices, 
crossed by four or five obscure revolving cords, of which two are visible 
behind the sutures; in front of the suture is a sloping space somewhat con¬ 
stricted, at the shoulder is a cord, followed by others with wider inter¬ 
spaces and toward the canal more feeble; the incremental lines are also 
conspicuous; canal twisted, recurved, rather short and wide, aperture 
white, body and pillar callous, the latter twisted and obliquely truncate in 
front forming a nearly pervious axis. Long, of shell, 25; of aperture and 
canal, 15 ; max. diam., 12 mm. (Dali.) 
Type in United States National Museum. Type locality, United States 
Fish Commission Station 3644, southeast coast of Kamchatka. 
Range. Western Bering Sea, in 100 fathoms. 
Trophon tolomius Dali, 1919 
Proceedings of the United States National Museum, 56:337. 
Shell small, short, inflated, white, with an angular shoulder near the 
periphery on the spire, with more than four whorls (the apex defective), 
the suture distinct, not appressed; axial sculpture of (on the last whorl, 
about 35) sharp ribs, regularly spaced, with wider interspaces, extending 
from the suture over the base; these ribs only become lamellose with sen¬ 
ility ; the canal is axially striated and the incremental lines visible; on the 
upper spire the intersection of the ribs and shoulder angle tends to become 
nodulous; aperture rounded, simple, body erased, canal narrow, a little 
recurved. Height of shell, 19; of last whorl, 15; of aperture, 10; diameter, 
10 mm. (Dali.) 
Type in United States National Museum, No. 222441. Type locality, 
United States Fish Commission Station 2896, off San Miguel Island, 
California. 
Range. Known only from type locality. 
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