188 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
Range. Santa Barbara, California, to Panama. 
Described and figured as Trochus antonii in Philippi, Abbildungen und 
Beschreibungen ncue odcr zvcnig gckannte Conchylien, “Trochus,” Table I, 
fig. 4 a. 
Calliostoma eximium Reeve, 1842 
Proceedings, Zoological Society of London, 185. Tryon and Pilsbry, Manual of Con- 
chology, 11:366; PI. 63, figs. 84-86. 
Troch. testa conico-pyramidali, pallide carneola, lineis transversis inter¬ 
rupts sparsim ornata; anfractibus superne concavis, in medio depresso- 
planis, bifuniculatis, funiculis albonigroque tessellatis; umbilico tecto. Alt., 
%; diam., £4 poll. (Reeve.) 
Shell conical, imperforate, rather solid and strong, light yellowish or 
grayish, with irregular, bluish-black, longitudinal maculations and streaks, 
the base dotted or with small maculations; sometimes without dark flames, 
their place taken by obscure brownish clouding, the larger spiral cords 
both above and below articulated with deep red. There are about eight 
whorls, each one more or less markedly biangular at the circumference, 
the lower angle obtuse, concealed by the suture on the spire, the upper one 
acute, continuing nearly to the apex; whorls concave above, slightly ex¬ 
cavated around the periphery, a little convex beneath; encircled by numer¬ 
ous unequal spiral threads, the larger ones beaded, the smaller irregularly 
crenulated by rather decided incremental striae. Base radiately striate, 
with about eight to twelve smooth spirals, their interstices without sec¬ 
ondary riblets. Aperture oblique, rhomboidal; columella heavy, smooth, 
its face concave, obtusely subdentate at base. Alt., 24; diam., 23 mm. 
(Tryon and Pilsbry, Manual of Concliology .) 
Type in Museum Cuming. Type locality, Payanam, in 10 fathoms. 
Range. Catalina Island, California, to Mazatlan, Mexico. 
Calliostoma tricolor Gabb, 1865 
Proceedings of the California Academy of Sciences, 3:186. Williamson, Proceedings 
of the United States National Museum, 15:201; PI. 19, fig. 8. 
C. t. conica, spira vix elevata; anfr. I nucleari, laevi; anfr. VI ad 
marginem truncatis, supra declivibus, infra planulatis; tota superficie con- 
fertim costata; costata; costis minute granulatis; colore fulvo. lineis pur- 
pureis albo maculatis, spiraliter fasciato; apertura subquadrata, intus mar- 
garitacea; labio crasso, labro acuto; umbilico albo. Long., .45; lat., .5; 
long, aper., .19, lat. aper., .24. 
Shell conical, spire somewhat elevated, nuclear whorls smooth; other 
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