390 bulletin: museum of comparative zoology. 



Lighter colored, with alternating zones and with sharper and deeper concentric 

 sulci, than those exhibited by T. atossa of the Panama fauna, which is the most 

 nearly related species. 



Tindaria thea Dall, n. ep. 



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 slir;litly 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; diani. 3.0 mm., the posterior extreme somewhat compressed. 



U. S. S. "Albatross," station 4054, N. 68° W., twenty-four miles from 

 Aguja Point, Peru, in 1036 fathoms, mud, bottom temperature, 37°- 3 F. TJ. 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 Verbill 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, pi. 13, fig. 10. 



Tindaria (Tindariopsis) sulculata Gould. 



Nucula sulculata Couthouy, in Gould, Wilkes' Expl. Exped., Moll., 1852, p. 424, 



pi. 37, figs. 539 a-e. 

 Leda sulculata Hanley, Thes. Conch., 1860, 3, Men. Nuculacea, p. 26, footnote ; 



not Lemhulus (= Leda) sulrulatus Risso, Eur. Mc'rid., 1826, 4, p. 320. 

 Leda lugubris A. Adams, V. Z. S. Lend., 1856, p. 49; E. A. Smith, P. Z. S. Lond.. 



1881, p, 39; Mabillc et Rochebrune, Mission Cap Horn, 1889, 6, Moll., 



p. II 113. 

 Leda oratirjira Mabille et Rochebrune, Mission Cap Horn, 1889, 6, Moll., p. II. 113, 



pi. 8, lig. 3. 



U. S. S. "Albatross," station 2778, Straits of Magellan, in 61 fathoms, mud, 

 bottom temperature 47°. 9 F. U. S. N. Mus. 110,697. Oraugc Harbor, Pata- 



