440 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
Superfamily DOCOGLOSSA. 
Family ACM4iIDAE. 
Genus ACMIEA Eschscholtz, 1828. 
Shell patelliform, solid, oval or circular, summit anteriorly directed and more or less in front of 
the middle; interior not iridescent and generally having an internal marginal border of color. 
Acmsea candeana d’Orbigny. 
Patella candeana d’Orbigny, Moll. Cubana, n, p. 199, pi. xxv, tigs. 1-S, 1845. 
Shell ovate, depressed, the apex in front of the middle, the slopes convex; surface whitish, finely 
regularly radiately striate, with radiating dark lines or sometimes broad irregular rays. Inside with a 
broad, light-colored translucent border, usually showing the outside rays; the central area brownish 
and often marbled. 
Length, 25; breadth, 21; height, 8 mm. 
Aguadilla, Porto Rico. 
Acmsea punctulata Gmelin. 
Patella punctulata Gmelin, Syst. Nut., xiii, pp. 3705, 3717, 1792. 
Acmsea punctulata Pilsbry, Man., xm, p. 37, pi. v, tigs. 99-113, 1891. 
Shell depressed, oval to nearly round, the apex sharp and subcentra] ; surface sculptured with 
low radiating ribs, every third or fourth one being larger. Color yellowish or pinkish, with distinct 
red dots bet ween the ribs. 
Length, 24; breadth, 18; height, 7 mm. 
Puerto Real; San Geronimo; Hucares; San Juan, Porto Rico. 
Acmaea punctulata var. pulcherrima Guilding. 
Smaller, smoother, more depressed, and more delicate than the type. 
Puerto Real; Aguadilla, Porto Rico. 
Acmaea leucopleura Gmelin. 
Patella leucopleura Gmelin, Syst. Nat., xm, p. 3699, 1792. 
Acmsea leucopleura Pilsbry, Man., xm, p. 40, pi. V, ligs. 16-26, 1891. 
Shell solid, round-oval, rather sharply conical, though sometimes depressed, with about twelve 
strong primary ribs and shorter interposed ribs at the base which do not reach the apex. Ribs 
white, the interstices brown or black. 
Length, 20; diameter, 16; height, 8 mm. 
One young shell was taken at Hucares, Porto Rico. 
Superfamily RHIPIDOGLOSSA. 
Family COCCULINIDAi. 
Genus COCCULINA Dali. 1882. 
Shell patelliform, not nacreous, colorless, with decussated sculpture, symmetrical, with an entire 
nonsinuated margin and a posteriorly inclined apex, with a spiral, usually deciduous nucleus; mus- 
cular impression horseshoe-shaped, interrupted over the head; radula rhipidoglossate. 
Cocculina portoricensis, n. sp. Plate 53, figs. 18, 19. 
Shell white, covered with a papery, pale olive-gray periostracum; apex subcentral, minute, 
hardly prominent; sculpture of rather sparse and feeble radial threads, incremental lines, and an 
almost microscopic sagrination without definite pattern, but chiefly concentric and occasionally 
microscopically pustular. Interior white, smooth, the muscular horseshoe-shaped impression very 
broad and high up in the shell, its anterior end directed in a contrary sense to the apex of the shell. 
Length from anterior end to apex, 5.7; of whole shell, 12; breadth, 8; height, 4.7 mm. 
Station 6052, San Juan Harbor, Porto Rico, in 310 fathoms. 
