CLASS GASTROPODA 
29 
iv. subtriangulatis, postice tabulatis, axi fere rectangulatis; suturis acute 
impressis; antice rapidissime angulatis, canali longa, arcuata; varicibus 
circ. vii. laminalis, arcuatis, ad angulum in spinam compressis, spinis 
radiantibus, parum superne arcuatis; linea seu angulo obsolete peripheriali, 
suturam continuante; apertura pyriformi; labro antice haud indentato. 
Long., 0.35; long, spir., 0.15; lat., 0.15. (Carpenter.) 
Resembles the young of M. centrifuga Hinds, and is related to Trophon 
muricatus Hinds. (Carpenter.) 
Shell thin, white, wide behind, narrow before; two nuclear and four 
normal whorls, the latter shouldered; rapidly narrowed to the front, 
with long, arcuated canal; varices about seven, acutely laminated, forming 
open, radiated, somewdiat curved spines around the shoulder; there is 
an obsolete angle or line on the periphery. Length, .35 in. (Tryon, 
Manual of Conchology.) 
Type in State Collection, No. 580a. Type locality, off Catalina 
Island, California. 
Range. Catalina Island and San Pedro, California. 
Trophon catalinensis n.sp. 
Plate 34, figs. 1, 2, 3, 4, 5 
Shell large, thin, yellowish brown; whorls seven, in addition to the 
nucleus; varices seven, wide and acutely laminated; the spines are guttered 
and rounded at the back; canal long, arcuate, and open the entire length. 
Interior of mouth polished and the inner lip has a thin wash of callus. 
Length of type, 100; breadth, including spines, 85 mm. 
Type in Stanford University Collection. Type locality off San Pedro, 
California, in 25 fathoms. 
Range. Known only from type locality. 
This shell has been called Trophon triangulatus Carpenter. It is a much 
larger shell. Carpenter’s shell measuring only 0.35 of an inch. 
Type locality is about the same for both species. 
Subgenus Neptunea (Bolten, part, 1798) Dali, 1902 
Trophon rotundatus Dali, 1902 
Plate 30, fig. 8 
Proceedings of the United States National Museum, 24:547. Bulletin 112, United 
States National Museum; PI. 15, fig. 3. 
Shell small, with rather short spire and five or more fully rounded 
whorls; nucleus eroded; subsequent whorls with (on the last) about 
fourteen keeled ribs, angular, but not spinose, at the shoulder, passing 
over the whorl to the base; spiral striation obsolete or none; aperture 
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