CALLIOSTOMA. 363 



Sitka to Santa Barbara and San Diego. INIr. Stearns and myself, 

 after an examination of the type, were disposed to consider C. 

 splendeus Cpr., as a very young specimen of tlie blue painted variety 

 above alluded to. 



( Group of C. annulatum Mart.) 



C. ANNULATUM Marty n. PL 67, fig. 43. 



Shell elevated-conic, imperforate, rather thin ; light yellow, dotted 

 with brown on the spiral rows of grains, the periphery or lower 

 edge of each whorl encircled by a zone of violet or magenta, the 

 axis surrounded by a tract of the same. Surface with numerous 

 granose lir?e, about 7 on the penultimate whorl, 9 or 10 on the base. 

 Spire conical, apex acute, minute, reddish ; sutures slightly impressed. 

 Whoils about 9, slightly convex, the last angular at periphery, flat- 

 .tened beneath ; aperture rhomboidal, oblique, fluted within. 



Alt. 30, diam. 25 mill. 



Sts. of F Ilea to San Diego. 



Trochus annu/dtus Mart., Univ. Conch., t. 33 (1784). — Philippi, 

 Conchyl. Cab., p. 11, t. 3, f 3-4.— Fischer, Coq. Viv., p. 74, t. 16, 

 f. 3. — Zizyphliius annulatus Mart., Reeve, Conch. Icon., f. — ■ 

 Chenu, Manuel, f. 2666. — Tr. virgineus Chemnitz, Conchyl. Cab. 

 X, p. 165, f 1581, 1582. — Tr. moniliferns "Lam. " Phil., CJonchyl. 

 Cab., p. 220, t. 33, f. 3 (not of Lamarck). — CalUostoma annulatum 

 of American authors. 



A lovely shell, the most beautiful of the West Coast Calliostomas. 

 This, like the last two species, was one of these treasures which the 

 famous Captain Cook first brought to Europe. 



C. platinum Dall. PI. 67, fig. 84. 



Shell conical, imperforate, very thin, nearly smooth, soiled white 

 with a delicate tint of sea-green on the last whorl; surface slightly 

 shining. The spire is conical, its outlines a trifle concave; wdiorls 8 ; 

 apex subimmersed, dextral, the first two whorls quite convex, the 

 following whorls slightly convex ; sutures linear, last whorl with a 

 delicate carina at the otherwise blunt periphery ; above this, par- 

 allel with it, there is a narrow raised cord which does not extend 

 above the lower whorl, and will probably be found to be quite 

 inconstant; the whole upper surface of the whorls is traversed by 

 numerous scarcely perceptible spirals ; the base is slightly convex, 

 and has close, unequal spiral striae, coarser near axis and circum- 

 ference. Aperture rather large, subquadrate, beautifully iridescent 



