476 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
Asaphis coccinea Martyn. 
Card j,um coccinea Martyn, Univ. Conch., No. 135, pi. 135, 17S4; Ed. Chenu, pi. 41, fig. 2; Mdroh, Jotirn. de Conchyl., VII, 
p. 140, 1S58. 
Shell oblong, subrhomboid, somewhat inflated, subsolid, with rather full, high beaks, with a well- 
developed, rounded posterior ridge; the surface is covered with numerous radiating, wavy ribs which 
are stronger on the posterior slope and are generally somewhat cancellated at the anterior and posterior 
ends by the crossing of the growth lines; they are sometimes a little seal}' at the hinder part of the 
shell; nymph rather narrow but deep; pallial sinus large, rounded. Color whitish, straw colored, 
salmon, reddish or violet, sometimes faintly rayed; within white, straw colored, yellow, red, or violet; 
the hinder part of the interior and nymphs almost always deep violet. 
Length, 70; height, 45; diameter, 32 mm.; length of another, 90; height, 60; diameter, 43 mm. 
Fajardo; Ponce Reefs, Porto Rico; Ensenada Honda, Culebra. 
Family DONACID/E. 
Genus DONAX Linnaeus, 1758. 
Shell inequilateral, triangular; anterior side longer than the posterior which is short and 
obliquely truncated; border of the valves generally crenated; hinge having in the right valve one 
anterior lateral and two cardinals, the posterior bifid, and a short posterior tooth. The left valve has 
a faint anterior lateral and two cardinals, with sometimes a small intermediate tooth and one posterior 
lateral; ligament short; sinus deep, rounded. 
Section CHION Scopoli, 1777. 
Donax denticulata Tinmens. 
Donax denticulate/, Linnaeus, Syst. Nat., ed. x, p. G83, 1758; Reeve, Conch. Icon., vm, pi. vn,figs.48 a, b, 1854. 
Shell solid, subinflated, long triangular, inequilateral, the anterior and posterior dorsal lines 
straight, the anterior end narrow and rounded, the base line slightly curved, with a faint angulation 
near its center; ligament short, small; surface covered with fine radiating ridges; these ridges are 
flattened except at the posterior part of the shell and are peculiarly serrate on their edges; posterior 
ridge double, the anterior part sharply angled, the area between the two angles ribbed and delicately 
sculptured between the ribs; posterior slope sculptured with rather strong oblique ridges, and between 
them are fine, raised, radial threads; inner edge of the shell dentate; pallial sinus deep. The range of 
•color is great; white, straw, salmon, brown, and violet, variously and often brightly rayed. 
Length, 28; height, 19; diameter, 11 mm. 
Aguadilla; San Juan Harbor; Mayaguez, Porto . Rico. A great number of beautiful living 
specimens were obtained at Mayaguez. 
Genus IPHIGENIA Schumacher, 1817. 
Shell subsolid, subtriangular, subequilateral ; inner edge of the valves smooth; hinge with two 
cardinals in each valve, the posterior in the right and the anterior in the left bifid; laterals wanting; 
ligament external; pallial sinus deep, rounded. 
Iphig-enia brasiliensis Lamarck. 
Capua brasUiensis Lamarck, An. sans Vert., v, p. 553, 1818; figured in Enc. M£th., pl.cci.xi, fig. 10. 
Shell rather solid, subinflated, the beaks a little nearer to the posterior ends, of a somewhat 
triangular or rhomboid form; posterior ridge moderately developed, ending in a blunt point at the 
posterior base; from this the basal line runs forward parallel with the anterior dorsal line to the center 
of the shell, from which it curves upward to the anterior point; surface showing the growth lines and 
having fainter, radial sculpture; epidermis smooth, livid or greenish ash color, often wearing off in 
old specimens; posterior cardinal of the right valve triangular, bifid; anterior cardinal narrow, and 
there is sometimes a low posterior lateral; anterior cardinal of left valve oblique, bifid, the left 
lamellar; interior whitish or purplish, the teeth often violet. 
Length, 60; height, 40; diameter, 23 mm. 
Catano, San Juan Harbor, Porto Rico, one specimen. Other specimens were bought in San Juan 
at the market. 
