CALLIOSTOMA. 369 



revolving strise. Columella thick, not reflected, but base somewhat 

 grooved or depressed behind it. Aperture about one-third of the 

 length of the whole shell, rhomboidal, pearly, smooth. Shell of a 

 beautiful light salmon color, ornamented near the suture and carina 

 ■with alternate patches of light yellow and chestnut-brown. (Dall.) 

 Alt. 17, diam. 15 mill, (specimen) ; Alt Tl, diam. -9 in. (DaH.) 



Monterey Bay, California. 



This elegant species was first referred by me to the Calliostoma 

 supragranosum, of Carpenter, on account of the granulated sutural 

 ribs. That species was described from very young shells, and no 

 typical authentic specimens wei-e at that time in California. Upon 

 comparing the young of gloriosum with the type specimen of supra- 

 granosum, in the Smithsonian collection, it was at once evident 

 that they were quite distinct. Several of the Californian species 

 have the sutural ribs more or less granulated, especially in young 

 specimens. The nucleus of gloriosum is, however, very much larger 

 than that of supragranosum. The adult of the latter has five 

 whorls. The whorls have a peculiar inflated appearance and are 

 not carinated. The last whorl loses the painting of brown and 

 Avhite and is of a dull brown, slightly concave above near the 

 suture, with a deep chink, not a fissure, behind the umbilical fissure. 

 The brown and yellow painting is very conspicuous on young 

 specimens of gloriosum. 



Calliostoma gloriosum Dall, Amer. Jour. Conch., vii, p. 127. 



The figure is drawn from a small but typical sj^ecimen loaned 

 me by Dr. Dall. 



C. SUPRAGRANOSUM Carpenter. PI. 67, fig. 71. 



Shell small, conical, rather thin, imperforate, light chestnut- 

 brown with a few short subsutural white flames and a peripheral 

 circle of alternating chestnut and white spots, the ribs of the base 

 minutely articulated with chestnut and white. The spire is conical, 

 short, composed of 5 convex whorls, the apical one very minute, 

 smooth, whitish ; the next 2 whorls are encircled by 2 strong, 

 articulated ribs ; on the next whorl these become beaded, and 

 smaller beaded riblets appear above them ; the last whorl has 4 

 (or 5) strong, elevated ribs around the middle, above them two or 

 three beaded ribs ; the base has 9 fine, distinct smooth concentric 

 lirre. The last whorl is somewhat biangular at periphery, slightly 

 convex beneath. Aperture nearlv round, oblique ; peristome thin, 

 24 



