390 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
Lighter colored, with alternating zones and with sharper and deeper concentric 
sulci, than those exhibited by 7. atossa of the Panama fauna, which is the most 
nearly related species. 
Tindaria thea DALL, n. sp. 
Shell small, thin, equivalve, inequilateral, very dark olive, plump, polished ; 
beaks anterior, high, slightly prosogyrate ; lunule not defined, a lanceolate impres- 
sion in the region for the escutcheon is not distinctly delimited ; anterior slope 
short, slightly arcuate, the valve margins slightly raised, the anterior end 
rounded ; posterior slope longer, straighter, posterior end attenuated and bluntly 
pointed ; basal margin prominently arcuate; surface smooth except for minute 
concentric undulations extending from the beaks to the base over the whole disk, 
best seen under a lens; interior porcellanous, margins entire, scars distinct, 
hinge with eight anterior and twelve to fourteen posterior teeth, the series not 
separated by a pit containing a small, internal resilium. Lon. 6.5; anterior end, 
1.5; alt. 4.0; diam. 3.0 mm., the posterior extreme somewhat compressed, 
U. S. S. “Albatross,” station 4654, N. 68° W., twenty-four miles from 
Aguja Point, Peru, in 1036 fathoms, mud, bottom temperature, 379.3 F. U.S. 
N. Mus. 110,577. 
Just about the color of dark wet tea-leaves after they have been steeped. 
Longer and more pointed, and more attenuated behind, than T. smirna, which has 
very similar sculpture but a more yellowish color. In looking from below, the 
series of hinge teeth seems uninterrupted, but the black color of the semi- 
internal resilium can be seen through the interstices, as it is situated above the 
tooth-line. 
Tindariopsis VERRILL AND BusH. 
Tindariopsis V. and B., Am. Journ. Sci., 1897, ser. 4, 3, p. 59; type, T. agathida 
Dall, Proc. U. S. Nat. Mus., 1889, 12, p. 252, pl. 13, fig. 10. 
Tindaria (Tindariopsis) suleulata Govrp. 
Nucula sulculata Couthouy, in Gould, Wilkes’ Expl. Exped., Moll., 1852, p. 424, 
pl. 37, figs. 539 a-e. 
Leda sulculata Hanley, Thes. Conch., 1860, 3, Mon. Nuculacea, p. 25, footnote; 
not Lembulus (= Leda) sulculatus Risso, Eur. Mérid., 1826, 4, p. 320. 
Leda, lugubris A. Adams, P. Z. S. Lond., 1856, p. 49; E. A. Smith, P. Z. 8. Lond., 
1881, p, 89; Mabille et Rochebrune, Mission Cap Horn, 1889, 6, Moll., 
p. H 118. 
Leda orangica Mabille et Rochebrune, Mission Cap Horn, 1889, 6, Moll., p. H. 118, 
pl. 8, fig. 3. 
U. S. S. “ Albatross,” station 2778, Straits of Magellan, in 61 fathoms, mud, 
bottom temperature 479.9 F. U.S. N. Mus. 110,697. Orange Harbor, Pata- 
