CLASS GASTROPODA 
35 
spirally striated, with eight or nine sharp, appressed varices rising into 
radiant, narrow-grooved spines at the shoulder; suture very distinct, aper- 
ure subovate, canal moderate, more or less recurved, pillar twisted, an¬ 
teriorly attenuated; base hardly constricted. Long, of shell, 16.5; of aper¬ 
ture and canal, 10.0; max. lat., 8 mm. (Dali.) 
Type in United States National Museum, No. 109109. Type locality, 
off Avalon, Catalina Island, in 80 fathoms. 
Range. Catalina Island to San Diego, California. 
Trophon eucymata Dali, 1902 
Plate 30, fig. 9 
Proceedings of the United States National Museum, 24:547. 
Shell not spiny at the shoulder, larger, with 15 to 18 varices, hardly 
raised and barely angular at the shoulder. Long., 27; max. lat., 9.5 mm. 
(Dali.) 
Type in United States National Museum, No. 109087. Type locality, 
off San Diego, California, Station 2935, in 124 fathoms. 
Range. Known only from type locality. 
Trophon bentleyi Dali, 1908 
Proceedings of the United States National Museum, 34 :249. 
Shell small, slender, acute, ashy-white, with about seven whorls ; nucleus 
with the surface eroded; suture distinct, the whorl in front of it somewhat 
tabulated by an obscure angle from which the spines arise; axial sculpture, 
besides incremental lines, only df about (on the last whorl) ten, sharp, de¬ 
pressed, lamellar varices, prominent only behind the periphery and feeble 
on the base; at the shoulder these are produced into high, usually recurved, 
gutted spines, which in some cases are nearly straight, in others curved 
toward the preceding whorl until they may even touch it; aperture ovate, 
canal long, slender, slightly recurved. Height, 19.5 ; of last whorl (without 
the spines), 14.5 ; of aperture and canal, 11.5 ; max. diam., 6.5 mm. (Dali.) 
Type in United States National Museum, No. 110684. Type locality, 
San Diego Harbor, in 20 fathoms. 
Range. Known only from type locality. 
Trophon pacificus Dali, 1902 
Plate 30, fig. 4 
Proceedings of the United States National Museum, 24:544. 
This species resembles T . beringi in miniature except that it has, with 
the same number of whorls, closer and more numerous varices, and the 
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