CALLIOSTOMA. 365 



swollen at the circumference. The surface is covered with sharply 

 granulose spiral threads; of these, three on the upper surface are 

 slightly larger ; midway between these lie two a trifle smaller ; and 

 the interspaces between these are occupied by still smaller beaded 

 lines ; on the base there are about 8 principal lira?, the interstices 

 and outer portion being occupied by smaller lirulae. The aperture 

 is quite oblique, iridescent and slightly silicate within ; columella 

 -oblique, grayish, a little truncated or obtusely dentate at base. 



Alt. 25, diam. 25 mill.; alt. 21, diam. 21 mill. 



Panama ; Acapidco. 



Tr. lima PHIL., Zeitschr. f. Mai. 1849, p. 159; Conchyl. Cab., p. 

 310, t. 44, f. 15. FISCHER Coq. Viv., p. 331, 1. 103, f. 2.Zizypkmus 

 antonii Koch, REEVE, Conch. Icon., f. Zl. Calliostoma (f lima, var.) 

 wquisculpta CPR., P. Z. S. 1865, p. 279 (young shell). 



This is a beautifully sculptured form. The 1st, 3d, 5th, 7th, 9th, 

 and llth lira? are very small ; the 2d, 6th and 10th large ; the 4th 

 and 8th are intermediate in size. These figures are subject to some 

 variation on account of the occasional interpolation of spiral threads, 

 but they show at least what the system of the sculpture is. Several 

 trays from Panama are before me. Fischer has with doubt identi- 

 fied the T. antonii Koch with this form. It seems to me to be 

 distinct in showing fewer lirse, with plain, unsculptured inter-liral 

 interstices, while this is never the case in lima, every space being 

 occupied by spiral beaded threads, which increase in number, as the 

 shell grows, by interpolation. 



C. ANTOXII (Koch) Philippi. PI. 67, figs. 46, 47, 48. 



Shell conical, solid, imperforate, dull flesh colored, granulate ; 

 whorls flat, encircled by 8 unequal series of granules, the second 

 largest ; base roughened by numerous granose cinguli. (Phil.) 



The shell is thick, quite conical, and consists of 7-8 whorls, 

 difficult to distinguish in the neighborhood of the apex. These 

 are flat and apparently margined, for one is likely to take the second 

 series of granules of the following whorl for a margin. The whorls 

 show about 8 rows of very pretty granules of three sizes ; the upper, 

 3d, 5th and 7th rows have th'e smallest granules, the 2d the largest ; 

 the 4th and 6th have middle sized granules. The periphery consists 

 of several closely crowded rows of the smallest size, and is rounded 

 on the lower whorls. The base is slightly convex, with a multitude 

 of granulose series, the granules becoming larger near the center, 



