442 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
Astralium caelatum Gmelin. 
Trochus cselatus, etc., Chemnitz, Conch. Cab., v, p. 33, pi. clxii, figs. 1536,1537. 
Trochus cselatus Gmelin, Syst. Nat., p. 3581, 1792. 
Shell solid, imperforate, pyramidal, with slightly convex whorls and subcarinate periphery, 
with flattened base, having immedately below the suture a series of strong, oblique, subradiating ribs, 
with finer oblique ribs between; the rest of the shell is sculptured with strong, revolving ridges, which 
are everywhere crossed by oblique, scaly lines of growth. Above the periphery these frequently form 
vaulted or subtubular processes; aperture very oblique; columella wide, curved, often having one or 
more grooves on its face. Color dirty white or greenish, radiately maculate with brown. 
Operculum oval; nucleus submarginal; the outside convex, white or brown tinted, coarsely 
granulose. It is much like that of Turbo, but the young shells are carinated and usually spiny on the 
periphery. 
Height, 80; diameter, 80 mm. 
Guanica; Playa de Ponce; Arroyo, Puerto Real, Porto Rico; Caballo Blanco Reef, Vieques; 
Ensenada Honda, Culebra. 
Astralium tuber Linnaeus. 
Trochus tuber Linnaeus, Syst. Nat., ed. x, p. 759, 1758. 
Astralium tuber Pilsbry, Trvon’s Man., X. p. 223, pi. LVI, figs. 79,80,1888. 
Shell solid, often rather elevated, with about six flattened or somewhat rounded whorls, 
sometimes a little shouldered, sculptured by fine and coarse, oblique ridges on the upper part of 
the whorls; base of the shell somewhat rounded, imperforate; columella wide, often excavated, 
bituberculate below. Color dirty white or greenish radiately maculate with brown. 
Height, 45; diameter, 45 mm. 
Guanica; Hucares; San Geronimo, Porto Rico; Caballo Blanco Reef, Vieques; West Indian region 
generally. 
This shell has much the appearance of a Turbo, but the young are subspinose at the periphery. 
Astralium longispinum Lamarck. 
Trochus longispinus Lamarck, An. sans Vert., vii, p. 10, 1822. 
Astralium longispina Pilsbry, Tryon’s Man., x, p. 221, pi. u, figs 1-9, 1888. 
Shell sublenticular, low, rounded above, less convex, sometimes nearly flat below; whorls six to 
seven, often obliquely rigid below the sutures, then with several revolving series of granules or vaulted 
scales; periphery sharply carinate, armed with strong, triangular, flattened spines which extend over 
the sutures to near the summit of the shell, there being about sixteen on the last whorl; base having 
strong radiating lamellae, which cross the five or six revolving tuberculous ridges; aperture transverse, 
rounded, channeled at the outer edge; umbilical region often excavated, but generally imperforate; 
aperture and columella silvery. Color white, yellowish, or light brown. 
Height, 20; diameter, 37 mm. Another shell, height, 16; diameter, 60 mm. 
Mayaguez Harbor; Puerto Real, Porto Rico; Culebra, West Indies; Florida Keys, etc. 
Astralium americanum Gmelin. 
Trochus americanus Gmelin, Syst. Nat., p. 3581, 1792. 
Astralium americanum Pilsbry, Man., X, p. 224, pi. LI I, figs. 18-20, 1888. 
Shell trochiform, elevated conical, with about nine nearly plane whorls, having the suture well 
marked, with strong, oblique growth lines, with irregular, obliquely radiate, often curved ridges 
throughout as far down as the periphery; there is generally a slightly defined revolving ridge just 
above the suture; aperture oblique, somewhat angulated at the rather sharp periphery, silvery; base 
with about eight revolving, scaly ridges.' Color white or yellowish. 
Height, 27; diameter, 27 mm. 
Aguadilla, Porto Rico, one young shell; West Indies, Florida Keys. 
Family TR0CHlD4t. 
Genus CHL0R0ST0MA Swainson, 1840. 
Shell conical, nacreous, umbilicate or imperforate, solid; aperture oblique, subrhomboid, the outer 
lip smooth within; columella arcuate, continued over or part way around the umbilicus, which, when 
open, shows one or more spiral ribs within; base of columella with two or more tubercles; operculum 
horny, circular, multispiral. 
