NO. 2183. NEW NORTHWEST AMERICAN BIVALVES— DALL. 401 



TINDARIA BRUNNEA, new species. 



Shell small, inflated, solid, subtriangular, of a warm yellow brown 

 color; beaks large, prominent, with no distinguishable lunule or 

 escutcheon, the ligament short but wholly external and behind the 

 beaks; the surface sculptured with rather regular fine incremental 

 lines which, toward the margin, appear almost like concentric ripples; 

 there are also very faint radial lines on some parts of the shell; base 

 arcuate, dorsal slopes nearly straight, anterior end rounded, posterior 

 rather bluntly pointed ; hinge with about eight anterior and fourteen 

 posterior teeth. Length, 7.5; height, 6; diameter, 4 mm. Cat. No. 

 226333, U.S.N.M. 



Station 3604, Bering Sea, in 1,401 fathoms. 



The bright color distinguishes this from the other species at a 

 glance. 



TI^a)ARIA MARTINIANA, new species. 



Shell small, solid, ohvaceous, inflated, subtriangular, inequilateral, 

 the beaks nearer the anterior end; sculpture of fine concentric and 

 still finer radial striae only visible under magnification; beaks full, 

 incm-ved, 3.5 mm. from the anterior end, a small lanceolate lunule 

 and a narrower and longer escutcheon are indicated only by the brown 

 color of their areas against the pale oUve of the shell; shell rounded in 

 front, pointed bluntly behind, the base arcuate, the dorsal slopes 

 nearly straight; hinge with 14 anterior and 16 posterior slender teeth, 

 the Hgament entirely external and posterior. Length, 8.6; height, 

 6.5; diameter, 5 mm. Cat. No. 207318, U.S.N.M. 



Station 4425, off the Santa Barbara Islands, Cahfornia, in 1,100 

 fathoms; also off Cape San Martin in 218 fathoms. 



TINDARIA RITTERI, new species. 



Shell small, plump, smooth except for incremental fines, brilliantly 

 polished, pale ofive, darker near the margin, rounded in front, inequi- 

 ateral, sfightly recurved, and bluntly pointed and attenuated behind ; 

 beaks low, ligament very short and wholly posterior, 10 or 11 slender 

 V-shaped teeth on either side. Length, 7; height, 4; diameter, 2.6 

 mm., the beaks, 2.5 mm. behind the anterior end. Cat. No. 209396, 

 U.S.N.M. 



Station 4325, off La Jolla, California, in 293 fathoms. 



TINDARIA DICOFANIA, new species. 



Shell small, ohvaceous, caUistiform, arcuate, with swollen beaks, 



concentrically uniformly sculptured, nearly equilateral, the anterior 



end shorter; a small lanceolate lunule and escutcheon present; both 



ends rounded, base conspicuously arcuate, the posterior end shghtly 



65008°— Proc.N.M.vol.52— 17 ^26 



