366 CALLIOSTOMA. 



which is a semicircle, its chord being the columella, formed of 

 inferior, gray nacre. The aperture is rhomboidal ; the outer lip has 

 a little distance within a brown streak. The color is dirty flesh 

 color, with a few very pale brown clouds and fewer dark brown 

 points. Alt. 18, diam. 23 mill. (Phil.) 



Habitat unknown.. 



T. antonii Koch, PHILIPPI, Abbild. u. Beschreib. i, Trochus, t. 1, 

 f. 4 (1843) ; Conchyl. Cab., p. 105, t. 17, f. 5. 



This is certainly very close to C. lima. The name has several 

 years priority. See remarks under that species. 



C. MACANDRE^E Carpenter. PL 17, figs. 35, 36. 



Shell subelevated, conical, w r horls a little convex, suture dis- 

 tinct ; red, maculated with paler ; encircled by spiral nodose lines, 

 6 on the penultimate whorl, the lower two a little larger ; inter- 

 stices impressed, sometimes with intercalated lirulse; tubercles close, 

 rounded ; periphery, slightly angulated ; base ornamented with 

 about 11 scarcely granulose line, interstices broad ; columella 

 scarcely excavated, a little twisted, umbilical region impressed. 

 (Cpr.) Alt. 8-3, diam. 8'4 mill. 

 Var. Shell rufous-brow T ii. with paler undulating waves ; base red.. 



Alt. 13, diam. 10* mill. 



Mazatlan (type) ; Panama (var.) 



Shell somewhat resembling a variety of T. antonii Koch in Phil., 

 w r hich however has a few granular rows much larger than the rest. 

 which are extremely fine and far apart. The whole upper surface- 

 in T. macandrece is covered with large tubercles. The base in T. 

 antonii is sculptured like the rest of the shell, and the columella has 

 a smooth scooped-out surface, which is wanting in this species. 

 The Mazatlan specimen, perhaps immature, has 7 whorls. The 

 variety from Panama has 9 whorls. ( Cjpr.) 



Trochus MacAndrece CARP., Cut. ^lazatlan Shells in Brit. Mus. 

 (Reigen Coll.), p. 232, 1857. 



C. EXIMIUM Reeve. PI. 65, figs. 84-86. Vol. X, pi. 41, fig. 28. 



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. 



