MOLLUSC A OF PORTO RICO. 
479 
Subgenus Akcopagia Leach, 1.327. 
Section CYCLOTELLINA Cossmann, 1886. 
Tellina fausta Donovan. 
Tellina fausta Donovan, Nat. Hist. Brit. Shells, p. 10, pi. xxv, figs. 13, 14, 180. 
May ague/,, Porto Rico (Gundlach). 
Section PHYLLODINA Dali, 1900. 
Tellina persica, n.sp. Plate 55, fig. 1. 
Shell small, rather thin, compressed, white, suffused with apricot yellow, paler on the umbones; 
form as figured; umbones small, nepionic shell smooth, polished, glassy, remainder of the surface 
sculptured by concentric, narrow, rounded, low, adjacent ridges, which on the dorsal areas become 
lamellose but not much elevated, and on the anterior lunular margin form a series of rather 
inconspicuous serrations; on the anterior dorsal margin is a very narrow lunular depression, but the 
escutcheon is almost linear; interior brilliantly polished, pallia! sinus free from the pallia! line below, 
except for a very short distance, rising high in the middle of the valve, rounded but rather narrow in 
front; interior of the disk apricot color; hinge normal, ligament long, on a narrow nymph. 
Length, 20.5; height, 13; diameter 5.5 mm.; the right valve slightly flatter than the left. 
Mayaguez Harbor, Porto Rico, in 20 to 30 fathoms, sand, at stations 6062 and 6064. 
This very elegant little shell resembles some of the Pliocene Tertiary species of the Antillean 
region, but there are no recent forms which approach it at all closely. It seems to be rather abundant. 
Section MERISCA Dali, 1900. 
Tellina lintea Conrad. 
Tellina lintea Conrad, Journ. Acad. Nat. Sci. Phila., vn, p. 259, pi. xx, fig. 3, 1837. 
Shell subrhomboid, subsolid, short, compressed, sharply flexed behind, with unusually high, 
sharp beaks; posterior end with a straight truncation above, ended by a sharp ridge on each valve; 
between this and the posterior ridge there its a shallow depression; postbasal point sharply triangulate; 
surface covered with rather close, sharp, concentric ridges; left valve With a slightly bifid anterior 
cardinal and a smaller posterior one; laterals scarcely developed; right valve with a bilobed posterior 
cardinal, a lamellar one in front of it, and two well-developed laterals. Color white. 
Length, 20; height, 13; diameter, 5 mm. 
Mayaguez, Porto Rico, two worn valves; Florida and Gulf coast. 
Section EURYTELLINA Fischer, 1887. 
Tellina alternata Say. 
Tellina alternata Say, Journ. Acad. Nat. Sci. Phila., iv, p. 275, 1822; Am. Conch., pi. r.xv, fig. 1. 
Shell rather solid, compressed, nearly twice as long as high; beaks a little behind the center; 
ligament prominent; dorsal and ventral lines nearly parallel, anterior end almost evenly rounded; 
posterior end with a long, straight truncation above; posterior ridge somewhat double, the hinder 
sharply defined, ending at the post-base in a narrow, ill-defined triangulation; surface sculptured with 
rather wide, irregular, concentric ridges, often with faint indications of radial sculpture; left valve with 
two cardinals, the anterior small, the posterior larger and bifid, with two faint laterals; right valve 
with a strong bifid posterior cardinal and a narrow anterior one, a strong near anterior and a remote 
posterior lateral; muscle scars well marked. Color whitish to deep pink. 
Length, 65; height, 35; diameter, 12 mm. 
Mayaguez, Porto Rico, one young white valve. 
Tellina georgiana Dali. 
Tellina ( Eurytellina ) georgiana Dali, Proc. U. S. Nat. Mus., xxm, No. 1210, p. 310, pi. ii, fig. 3, 1900. 
Shell oblong, slightly rhomboid, compressed, thin, with a low posterior ridge which ends in a 
rounded point at posterior basal end of shell; surface more or less covered with wide, faint, flattened 
ridges, reddish or pinkish, sometimes with one or two faint white rays behind, shining, iridescent; 
left valve with a stronger anterior and a fainter posterior cardinal, with scarcely developed laterals; 
right valve with two cardinals, the hinder bifid, with a strong anterior and a faint posterior lateral. 
Length, 17; height, 10; diameter, 4 mm. 
Mayaguez; Aguadilla, Porto Rico. 
