ball: mollusca and brachiopoda. 389 



Tindaria smirna Dall 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 ou 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 margiu with about ten fine concentric grooves, crossed by very fine 

 radial striae; basal margiu 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. S. " Albatross," station 3360, Gulf of Panama, in 1672 fathoms, sand, 

 bottom temperature 42° F. U. S. N. Mus. 122,919. 



Pretty close to T. atossn, but much more brilliantly polished, the shell shorter, 

 more turgid, more nearly equilateral, and with the ligament distinctly and sub- 

 equally amphidetic, while in T. atossa 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 Dall, n. sp. 



Plate 17, 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, tiie anterior end 

 rather attenuated, rounded ; posterior end longer, somewhat attenuated, the dor- 

 sal slope flattisli, 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 porcellauous. 

 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 T. smirna, but with more prominent beaks; shorter and blunter, 

 in proportion to height, and decidedly loss pointed and produced behind. 



Tindaria virens Pall. 

 Malktia (Tindaria) virens Dall. Proc. U. S. Nat. Mus., 1889, 12, p. 254, pi. 13, fig. 3. 



Coast of Southern Chile and "Western Patngonia at U. S. S. " Albatross," 

 stations 2781, 2782, 2783, 2784, and 27S5, in 122 to 449 fathoms, mud, bottom 

 temperatures 47° F. to 51°.9 F. 



