366 CALLIOSTOMA. 



which is a semicircle, its chord being the columeUa, 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. (P/u7.) 



Habitat unknown. 



T. antonii Koch, Piiilifpi, 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. PI. 17, figs. 35, 36. 



Shell subelevated, conical, whorls 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 lirulce ; tubercles close, 

 rounded ; periphery, slightly angulated ; 1)ase ornamented with 

 about 11 scarcely granulose lir?e, interstices broad ; columella 

 scarcely excavated, a little twisted, umbilical region impressed. 

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

 Var. Shell rufous-brown, with paler undulating waves ; base red. 



Alt. 13, diam. 10* mill. 



Mazatlan (type) ; Panavia (var.) 



Shell somew'hat resembling a variety of T. antonii Koch in Phil., 

 which however has a few granular rows much larger than the rest. 

 which are extremely fine and fiir apart. The whole upper surfiice 

 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 wdiorls. The 

 variety from Panama has 9 whorls. (Cpr.) 



Trochus MacAndrem Carp., Cat. Mazatlan 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 

 laro-er spiral cords both above and below articulated with deep red. 



