MOLLUSC A OF PORTO RICO. 
437 
Calyptreea candeana d’Orbigny. 
Infundibulum candeanum d’Orbigny, Moll.Cubana, n, p. 190, pi. xxv, figs. 28-29, 1845. 
Shell small, rounded, thin; spire elevated; growth lines rugose; sometimes obsoletely, finely, 
radiately striate; white within and without. 
Diameter, 5; height, 2 mm. 
Mayaguez, Porto Rico, a great number of dead shells. 
Genus CREPIDULA Lamarck, 1799. 
Shell oval to oblong; apex posterior, oblique; interior porcellanous, shining; a thin, horizontal 
septum or shelf occupies nearly the posterior half of the shell within; free border of shelf straight or 
arcuate. 
Crepidula aculeata Gmelin. 
Patella aculeata Gmelin, Syst. Nat., p. 3693, 1792. 
Crepidula aculeata Tryon, Man., vm. p. 129, pl.xxxix, figs. 01-05, 1880. 
Shell irregularly oval, with one and a half to two whorls, the nuclear whorl smooth and very 
distinct from the rest of the shell; growth lines rough, sometimes a little imbricated; the surface is 
generally covered with subspiral lines of erect, prickly, often tubular scales; growth lines of the shelf 
finely marked, and with the edge of the shelf shaped something like a brace Color whitish, 
variegated with brown; the shelf white, with translucent lines. 
Length, 28; breadth, 21; height, 10 mm. 
Arroyo and off Point Melones, Porto Rico. Distributed almost universally throughout the warm 
seas of the globe. Young specimens of one or two other species were obtained by the Fish Hawk 
expedition, but not in condition to be satisfactorily named. 
Crepidula riisei Dunker. 
Crepidula riisei Dunker, Zeitschr. Mai., p. 59, 1852; Morch, Mai. Blatt., XXIV, p. 105, 1877. 
Crepidula protca d’Orbigny (ex parte), Moll. Cubana, n, p. 192, pi. xxiv, figs. 32, 33, 1845. 
San Juan, Porto Rico, Riise; Mayaguez Harbor, U. S. Fish Commission. 
This form much resembles the Crepidula plana Say, being a resident of the inside of dead shells, 
but may be distinguished by its traces of longitudinal brown lines near the apex and its fringed and 
conspicuous periostracum. 
Crepidula protea d’Orbigny. 
Crepidula protea d’Orbigny, Moll. Cubana, it, p. 192 (ex parte), pi. xxiv, figs. 30,31, 1845. 
A single specimen of this species was obtained at Mayaguez, Porto Rico. 
Family AMALTHEIDAL 
Genus AMALTHEA Schumacher, 1817. 
Shell irregular, conic, with the apex curved and directed to the rear, sometimes coiled; surface 
irregular; muscular impression horseshoe-shaped; base thick or excavated. 
Amalthea antiquata Linnaeus. 
Patella ant iquata Linnseus, Syst. Nat., ed. xii, p. 1259, 1767. 
Ilipponyx antiquatiis Tryon, Man., vm, p. 134, pi. XL, figs. 93-99, 1886. 
Shell white, the apex posterior; concentrically rudely and closely lamellated, more or less 
radiately striate: epidermis pilose. 
Length, 18, height, 7 mm. 
Puerto Real; Arroyo; Aguadilla, Porto Rico; Ensenada Honda, Culebra. 
Amalthea subrufa Lamarck. 
Pileopsis subrufa Lamarck, An sans Vert., vi, part II, p. 18, 1822. 
Hippnnyx subnifus Tryon, Man., vm, p. 134, pi xl, fig. 1, 1886. 
Quebradillas, Porto Rico (Gundlach). 
A young specimen of what is probably this species was obtained by the Fish Hunk expedition 
at Mayaguez, Porto Rico. 
