CLASS GASTROPODA 
31 
Trophon dalli alta Dali, 1902 
Proceedings of the United States National Museum, 24:548. 
The spire exceptionally elevated. The chief peculiarity of this species, 
apart from its muricoid form, is the appearance of the spines on the 
shoulder, which vary in number from fifteen to twenty-one, and which 
often have an appearance as if they were independent of the varices 
and had been separately stuck on to the whorl. There are usually five 
whorls, exclusive of the nucleus, and full-grown specimens reach about 
60 mm. in length. The spire and long canal are frequently distorted, 
and the aperture, usually white, is sometimes internally tinged with 
yellow. (Dali.) 
Type in United States National Museum. Type locality, Bering Sea. 
Range. Known only from type locality. 
Trophon scitulus Dali, 1891 
See Part I, Plate 15, fig. 4 
Proceedings of the United States National Museum, 14: 188; 17; PI. 27, fig. 5, 1894. 
Shell thin, small, white, five-whorled; closely sculptured with regu¬ 
larly spaced, low, imbricate lamellae rising to spines at regular intervals 
on the spirals; on the upper whorls two, and on the last whorl six spirals, 
of which at the shoulder the hindmost bears the longest spines and is 
separated from the suture by a wide space; there are on the last whorl 
thirteen grooved spines on this spiral; canal long, recurved. Length of 
shell, 17.5 ; of aperture, 11; breadth of shell, 8.5 mm. (Dali.) 
Type in United States National Museum. Type locality, U.S.S. 
“Albatross” Station 3227, off coast of Unalaska Island, Bering Sea, in 
225 fathoms. 
Range. Pribilof Islands to Unalaska Island, Bering Sea. 
Trophon disparilis Dali, 1891 
See Part I, Plate 15, fig. 8 
Proceedings of the United States National Museum, 14:189; 17; PI. 27, fig. 4, 1894. 
Shell small, white, thin, elongate, with five whorls, with numerous, 
hardly raised, transverse ridges or lamellae on the sutural side of the 
last whorl, while the anterior part of the same whorl is sculptured with 
four, spiral, hardly raised ridges, and the transverse sculpture fails or 
becomes feebler; whorls rounded, suture deep, canal long, curved, aper¬ 
ture rounded, simple. Length of shell, 15; of aperture and canal, 11; 
breadth of shell, 7 mm. (Dali.) 
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