448 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
Superfamily ZY GOBEAN CHIA. 
Family FISSURFLL1DJE. 
Subfamily FISSURELLIN JE. 
Genus FISSURELLA Bruguiere, 1791. 
Subgenus Fissukella s. s. 
Shell conical, its base oval or elliptical; apex spiral in the young, removed in the adult, having 
a rounded or elliptical anal opening which is bounded inside by a callus with entire margins, not 
truncate or excavated behind. Shell capable of containing the entire animal. 
Section CREMIDES H. Sc A. Adams. 
Fissurella barbadensis Gmelin. 
Patella barbadensis Gmelin, Syst. Nat., p. 3729, 1792. 
Fissurella barbadensis Pilsbry, Man., xn, p. 164, pi. xxxvn, figs. 40-49, 1890. 
Shell solid, low, conical, with ovate base; apex subcentral, with rounded opening. Surface sculp- 
tured with radiating ribs; eleven of these are generally stronger, and all are more or less rudely scaly. 
Color whitish, variegated with brown or purplish markings; interior generally greenish, often zoned. 
Greatest length, 38; breadth, 26; height, 15 mm. 
San Juan; San Geronimo; Ponce; Aguadilla; Guanica, Porto Rico; West Indies; Florida Keys. 
The species is variable in the degree of elevation, sculpture, and in coloring, and very abundant. 
One shell from San Geronimo measures as follows: Length, 26; breadth, 15; height, 6 mm.; and the 
principal ribs are white. 
Fissurella rosea Gmelin. 
Patella rosea Gmelin, Syst. Nat,., p.3730,1792. 
Fissurella rosed Pilsbry, Man., xii, p. 166, pi. lxii, figs. 19-21, 1890. 
Shell rather thin, low, conical, ovate, narrowed in front; apex a little in front of the middle of 
the shell; anal perforation elliptical; surface sculptured with numerous low, rounded, sometimes 
slightly scaly riblets; internal callus not inflated. Color grayish, with ten to twelve broad, purple 
rays; sometimes almost the entire surface is purplish; interior greenish, often purple or rose-tinted. 
Length, 26; diameter, 18; height, 7 mm. San Geronimo; Aguadilla, Porto Rico. 
This species is close to F. barbadensis, but is a thinner, more delicate, and generally smoother 
form. 
Fissurella nodosa Born. 
Patella nodoscC Born, Mus. Gees. Vine!., p. 429, 1780. 
Fissurella nodosa Pilsbry, Man., xn, p. 164, pi . xxxvii, figs. 46-48, 1890. 
Shell oval, solid, conical, considerably elevated; apex subcentral, with a keyhole-shaped orifice; 
surface sculptured with strong, radiating, nodose ribs. Color uniform brownish or white. The internal 
callus is distinctly marked but not swollen, and from it there are generally faint radiating grooves that 
mark the position of the ribs. 
Length, 30; breadth, 22; height, 17 mm. 
San Geronimo; San Juan; Aguadilla, Porto Rico; West Indian region generally. 
Subgenus Clypidella Swainson. 
Fissurella fascicularis Lamarck. 
Fissurella fascicularis Lamarck, An. sans Vert., vi, p. 14, 1822. 
Fissurella fascicularis Pilsbry, Man., xn, pi. 177, p. xxxvii, figs. 59, 60, 1890. 
Shell depressed, oval, moderately solid, the ends slightly raised ; orifice somewhat cross-shaped, 
elongated, narrow, and with a wider area in the middle; surface sculptured with numerous fine, 
radiating, roughened, or nodulous ribs which are reddish brown or crimson, usually darker than the 
intervening spaces; within the border is thickened and nearly smooth; the callus is distinct and 
radiately ridged and the color is pink, purplish, and whitish, often shaded green. 
Length, 21; diameter, 17; height, 6 mm. San Juan; San Geronimo, Porto Rico. 
A lovely, somewhat saddle-shaped species,- close to and easily mistaken for F. pustula Lamarck. 
The latter, however, is decidedly truncated in front, while the species under consideration is rounded. 
