MOLLUSCA OF PORTO RICO. 
411 
Purpura haemastoma yar. floridana Conrad. 
Purpura floridana Conrad, Journ. Acad. Nat. Sci., Phila., vir, pi. xx, tig. 21, 1837. 
A little larger than the variety undata, with or without two rows of low tubercles, with rather 
strong, revolving sculpture. Whitish, variegated with reddish brown, the color sometimes in short, 
revolving blotches and sometimes in irregular longitudinal streaks. Inside the shell is usually pale 
brownish, with a white border on the inside of the lip. 
Length, 55; diameter, 30 mm. 
Mayaguez, three shells. A common form in the West ^ndian region and on the Florida Keys. 
Purpura trinitatensis Guppy. 
Purpura trinitatensis Guppy, Proc. Sci. Assoc. Trinidad, 1869; Ann. Mag. Nat. Hist., 4th ser., xv, p. 50, 1875. 
Caballo Blanco Reef, one specimen; also Trinidad and the northern coast of Brazil. 
This has the colors of P. undata, but with a much more solid and shorter shell, strongly 
sixdenticulate on the outer lip, the pillar with an obscure median fold, as in P. columellaris, but the 
pillar not excavated externally; the base of the pillar obliquely striate and brown tinted, most of the 
mouth callus white or purple brown. It recalls P. deltoidea in form and solidity, but has a differently 
colored and sculptured aperture. 
Purpura deltoidea Lamarck. 
Purpura deltoidea Lamarck, An. sans. Vert., vn, p. 247, 1822. 
Purpura deltoidea Reeve, Conch. Icon., hi, pi. iv, fig. 18, 1846. 
Shell solid, short, with a single row of strong tubercles on the whorls, which forms a shoulder; 
sculptured throughout with revolving line and line grooves; aperture whitish, purple stained on the 
columella. Color white, with broad, irregular, broken, black bands. 
Length, 45; diameter, 35 mm. 
Aguadilla; Hucares; Puerto Real; San Juan; Guanica; Hucares; Cabo Rojo light, Porto Rico; 
Ensenada Honda, Culebra; Caballo Blanco Reef, Vieques. Abundant throughout the West Indian 
region and the Florida Keys. 
Genus SISTRUM Montfort, 1810. 
Shell oval, thick, tuberculous or spinose; aperture oblong, canaliculate above; outer lip furnished 
with strong teeth within; columella with slight plications. Operculum oval, straight, with lateral 
nucleus. 
Sistrum nodulosum C. B. Adams. 
Purpura nodulosa C. B. Adams, Proc. Bost. Soc. Nat. Hist., 1845, p. 2. 
Ricinula nodulosa Tryon, Man., ii, p. 190, pi. lix, fig. 275, 1880. 
Shell rather elongated, with about eight whorls, with ten or twelve longitudinal ribs, which are 
broken by revolving ridges into strong nodules; surface covered with tine, revolving, sometimes scaly 
threads; outer lip thickened and varicose, with four whitish teeth within; columella with two or three 
faint folds on its face, and there is a strong angular callus on the upper part of the parietal wall. Color 
black, with occasional white spots between the tubercles; the white spots sometimes form broken 
bands; aperture bluish and blackish within. 
Length, 20; diameter, 9 mm. 
Cabo Rojo light; Ponce Reefs; San Juan; Puerto Real; Porto Rico; Ensenada Honda, Culebra; 
West Indies, etc. 
Family C0RALL10PH 1 UD.L. 
Genus CORALLIOPHILA H. & A. Adams, 1853. 
Shell irregular, purpuriform, with a short spire; aperture large; surface rasp-like; outer lip simple, 
lirate, or smooth within; columella flat or excavated, callous, with or without an umbilical opening 
at its base. Operculum with a lateral nucleus. 
