492 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
Codakia costata d’Orbigny. 
Lucina costata d'Orbigny, Moll. Cubana, II, p.296, pi. XXVII, figs. 40-42,1846. 
Shell suborbicular, somewhat inllated, rather solid, with moderately high beaks placed just 
behind the middle of the shell, and turned forward over a small, elongated lunule; surface covered 
with fascisulate, radiating ridges, which are often alternately larger and smaller; these are crossed by 
finer, concentric threads, which cause the shell to be rough and finely cancellated; left valve with 
two cardinals, the hinder smaller, and two anterior and two posterior laterals; right valve with one 
cardinal, a faint posterior ridge that extends from the beak to form a lateral and one anterior lateral; 
beak cavities deep; anterior scars long, somewhat oblique; posterior scars semicircular; pallia! line 
deep, somewhat crenated; interior rough; border distinctly serrate. Whitish or pale lemon color. 
Length, 9; height, 8; diameter, 5 mm. 
Arroyo, Hucares, Porto Rico, one valve from each locality. 
The beaks are nearer the center than in C. pectinella, the shell is solider, and the sculpture is 
fascisulated. It is the Lucina antillarum of Reeve. 
Codakia pectinella C. B. Adams. Plate 58, fig. 9. 
Lucina pectinella C. B. Adams, Contr. to Conch., p. 246, 1852. 
Shell small, short elliptical, inflated, subsolid, with full beaks placed somewhat behind the 
middle of the shell and turned forward over a small lunule, with numerous, radiating, wider and 
narrower ribs, which are crossed by a great, number of concentric, raised threads; the ribs are almost 
wanting at. the anterior and posterior ends; left valve with two cardinals and two anterior and two 
posterior laterals; right valve with one cardinal, one anterior and two posterior laterals; anterior 
muscle scars somewhat elongated and oblique; posterior scar oval; interior of the shell roughened; 
border crenate. Color white or yellowish. 
Length, 7.5; height, 8; diameter, 4 mm. 
Mayaguez, one adult valve and a number of small ones; San Juan Harbor, one valve. A single 
alcoholic specimen was obtained at Mayaguez. 
The species is now figured for the first time from a specimen named by Professor Adams. 
Genus LUCINA (Bruguiere 1792) Lamarck 1799. 
Shell suborbicular, almost equilateral, rather thin, concentrically striate; ligament in a groove; 
lunule short.; teeth all obsolete or rudimentary, often wanting. 
Lucina chrysostoma Mdrch. 
Loripcs chrysostoma Morch, Yoldi Cat., II, p. 32, 1853; Chemnitz, Conch. Cab., vn, figs. 427-429. 
San Juan, Porto Rico (Gundlacli). 
Morch cites this name as of Meuschen, but the Museum Geversianum uses a peculiar nomencla- 
ture not Linnean. It is the Anodontia alba of Link. The shell is recognizable by its large size and 
mellow orange suffusion, from which the early conchologists came to call it, “The apricot.” 
Lucina phenax, n. sp. 
Shell small, suborbicular, inflated, thin, with the hinge teeth obsolete. Color wdiite, with a 
grayish papery periostracum chiefly in evidence near the margins; beaks polished, prosogyrate, with 
a deeply impressed, rather long and narrow lunule in front of them, especially in the right valve; disk 
sculptured by rather distant, evenly spaced, low, concentric elevated lines, which become more or less 
lamellose near the hinge margin, and more crowded toward the base; interior of shell white, not 
punctate, hinge margin narrow with no traces of laterals, and only a trace of an obsolete cardinal 
tooth; margins thin, smooth. 
Length, 9; height, 8; diameter, 5.5 mm. 
Station 6062, Mayaguez Harbor, Porto Rico, in 30 fathoms, sand; also in San Juan Harbor, at 
station 6054, in 5 fathoms. 
This shell has a deceptive likeness externally to a young Phacoicles pensylvanicus, but differs from 
it in its edentulous hinge and thinner valves. It is figured by Dali in the Synopsis of the Lucinacea, 
pi. xl, fig. 3. 
