444 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
with a large green patch. Shell whitish or greenish, with maculations or zigzag stripes of black; often 
the whole of the upper surface is nearly or entirely black. 
Height, 70; diameter, 80 mm. 
San (Jeronimo; Cabo Rojo light; Aguadilla; Ponce; Hucares; San Juan; Guanica, Porto Rico; 
Caballo Blanco Reef, Vieques. 
This beautiful species is extremely abundant on the coral rocks of the entire West Indian region, 
and is used for food in many places. The operculum is a lovely object. 
Genus MICROGAZA Dali, 1881. 
Shell flattened, rotelliform, nacreous within and without, umbilicated; lip thin; columella 
without a callus. 
Microgaza rotella Dali. 
Microgaza rotella Dali, Bull. Mus. Comp. Zool., ix, p. 51, 1881; XXIX, p. 357, pi. xxn, figs. 5, 5a, 1889. 
Shell depressed, lenticular; whorls about five, the earlier two or three rounded, the apex elevated; 
at the suture of the later whorls there is an elegant row of small nodules; last whorl subcarinate 
on the periphery; umbilicus wide, bounded at its edge by a sharp, crenated angle; aperture nearly 
semilunar; columella short, nearly straight. The shell sometimes has traces of very line, revolving 
threads. It is beautifully iridescent throughout and is often marked with zigzag brown flames. 
Diameter, 6; height, 4 mm. 
Aguadilla; Mayaguez, Porto Rico. 
Genus SOLARIELLA Searles Wood, 1842. 
Shell umbilicated, conical; whorls with spiral granose line; umbilicus with a carinated margin. 
Type, S', carinata S. Wood. 
Solariella amabilis Jeffreys. 
Troclius amabilis Jeffreys, Brit. Conch., in, p. 300, 1865; v, pi. i.xi, fig. 6. 
Shell pyramidal, pearly, somewhat iridescent, with two spiral ridges on the upper part of the 
last three or four whorls, with several finer irregular ridges on the base of the shell; the suture is 
deep and narrow, and below it on the sloping shoulder are numerous radiating ridges; aperture small, 
nearly round, the last whorl but slightly joined to the penultimate whorl; umbilicus rather large, 
funnel-shaped. 
Height, 8; diameter, 7 mm. 
Mayaguez, Porto Rico, one broken shell. 
Genus CALLIOSTQMA Swainson, 1840. 
Shell generally imperforate, conical, rather thin; whorls smooth, spirally ridged of granular, the 
last generally angular at the periphery; aperture subquadrangular; columella generally ending in an 
obscure tooth. 
Type, Trochus zizyplvinus Linnaeus. 
Calliostoma jujubinum Gmelin. 
Troclius jujubinus Gmelin, Syst. Nat., p. 3570, 1792. 
Calliostoma jujubinum Pilsbry, Man., xi, p. 101, pi. xi,, fig. 16, 1889. 
Shell pyramidal, rather solid, with nearly flat whorls, the last roundly carinate below. They are 
generally a little concave and swollen on the base and are sculptured with numerous spiral, beaded 
line, with finer beaded threads between; aperture subquadrate; umbilicus narrow, slightly funnel- 
shaped. The lip is generally lirate within. Color chestnut or purple brown, with narrow curved 
longitudinal white streaks, the base generally dotted with white. 
Height, 33; diameter, 26 mm. 
Mayaguez, Porto Rico, the lower part of a shell of one of the varieties. 
Calliostoma jujubinum var. rawsoni Dali. 
Calliostoma jujubinum var. rawsoni Dali, Blake Report, ii, p. 369, 1889. 
Smaller, with narrower umbilicus; columella thin, and the tooth which is found in the type is 
weak or absent. Shell more conical than the type and much darker in color. 
Vieques, one shell. 
