DALL: MOLLUSCA AND BRACHIOPODA. 389 
Tindaria smirna Dat n. sp. 
Plate 17, figures 6, 7. 
Shell small, polished, subtriangular, of a blackish olive tint, plump, the beaks 
nearer the anterior end; posterior end acutely pointed, anterior bluntly rounded ; 
beaks low, with a small black ligament extending on both sides of them; anterior 
slope short, straight, posterior longer, flattened ; neither lunule nor escutcheon 
present ; valves smooth on the beaks and over two thirds of the surface, but near 
the basal margin with about ten fine concentric grooves, crossed by very fine 
radial striae; basal margin evenly arcuate ; interior dull pearly, the hinge with 
about eight anterior and twelve posterior teeth. Lon. 5.5; height, 4.0; max. 
diam. 2.7; beaks to anterior end, 2.0 mm. 
U.S. 8. ‘ Albatross,”’ station 3360, Gulf of Panama, in 1672 fathoms, sand, 
bottom temperature 42° F. U.S. N. Mus. 122,919. 
Pretty close to 7. atossa, but much more brilliantly polished, the shell shorter, 
more turgid, more nearly equilateral, and with the ligament distinctly and sub- 
equally amphidetic, while in 7. a¢ossa it appears, to the naked eye, to be entirely 
opisthodetic, though on opening the valves a small portion is seen to pass in front 
of the beaks. 
Tindaria mexicana Da tt, n. sp. 
Plate 1%, figures 11, 14. 
Shell small, solid, rounded-triangular, subequilateral, olivaceous, polished ; 
beaks prominent, prosocoelous, slightly anterior, inflated, concentrically minutely 
threaded; the sculpture extends to the middle of the base, is a little less con- 
spicuous on the dome of the valve and almost entirely absent near both ends, 
ceasing rather abruptly; anterior slope short with no lunule, the anterior end 
rather attenuated, rounded ; posterior end longer, somewhat attenuated, the dor- 
sal slope flattish, the end rather abruptly rounded; base roundly arcuate ; liga- 
ment minute, amphidetic; anterior hinge line with eleven, posterior with about 
twenty-one teeth, the central ones small and obscure; interior porcellanous. 
Lon. 5.2; alt. 4.0; diam. 2.8; beaks behind anterior end, 2.0 mm. 
U.S. S. “ Albatross,” station 3418, off the Mexican coast in 660 fathoms, 
sand, bottom temperature 39° F. U.S. N. Mus. 122,925. 
Very similar to 7. smirna, but with more prominent beaks; shorter and blunter, 
in proportion to height, and decidedly less pointed and produced behind. 
Tindaria virens Dat. 
Malletia (Tindaria) virens Dall, Proc. U. S. Nat. Mus., 1889, 12, p. 254, pl. 13, fig. 3. 
Coast of Southern Chile and Western Patagonia at U. 8. 8. “ Albatross,” 
stations 2781, 2782, 2783, 2784, and 2785, in 122 to 449 fathoms; mud, bottom 
temperatures 47° F. to 519.9 F. 
