252 REPORT ON ALBATROSS MOLLUSCA BALL. 



lial line obscure, with a large rounded sinus; margins simple, smooth. 

 Longitude of shell 15.5; altitude, 9; diameter, G"" 11 . 



Hab. — IT. S Fish Commission Station 2793, off the coast of Ecuador 

 in 741 fathoms, mud; bottom temperature 38°.4 F. 



This species is most like M. arruana Smith from the Arm Islands, 

 but that species has the upper posterior corner beveled off and no 

 longer angular, which makes a marked difference in the outline of the 

 shell. M. obtusa, which has somewhat the same form, wants the marked 

 furrows of the posterior end of this species. 



Malletia (Tindaria?) aeolata sp. uov. 



Shell small, thickish, pale straw color, subrectangular; surface 

 smooth and polished at the umbones, gradually becoming strongly 

 concentrically ridged with rounded narrow ridges separated by mostly 

 linear interspaces ; anterior end longer, nearly evenly rounded, a little 

 produced below ; posterior end shorter, longest above, obliquely trun- 

 cate with a concave wave between the upper point and the beginning 

 of the little-curved base; beaks full, not prominent; no visible lunule 

 or escutcheon ; hinge margin broad, with eleven anterior and eight 

 posterior W -shaped teeth, of which four or five on each side are not de- 

 veloped; ligament central uuder the beaks, small, wholly external to 

 the tooth line; interior polished, scars and pallial line rather obscure. 

 Maximum longitude 4.5; altitude 3; diameter 2.5; vertical of beaks 

 from anterior end 2.8 mm . 



Hab. — Station 2754, in 880 fathoms, ooze, east from Tobago ; temper- 

 ature 37°.9 F. 



Nearest to the young of M . australis or the adult M. excisa, but of 

 different form from the latter, stouter and more rectangular and less 

 deeply notched. 



Malletia (Tindaria) amabilia Dall. 



Malletia (Tindaria) amabilis Dall, Bull. Mus. Comp. Zo8L, XVIII, p. 438, PI. XL, Fig. 

 8, June, 1889. 



This species was obtained from Stations 2751 and 2754, in 607 

 fathoms, oo/e, off St. Kitts, and 880 fathoms, ooze, east from Tobago ; 

 temperatures 39°.9 and 37°.9 F., respectively. 



Malletia (Tindaria) agathida sp. nov. 



Plate xin, Fig. 10. 



Shell small, stout, white, with prominent umbones; produced and 

 rounded before, shorter and pointed behind, with close, strong, sub- 

 equal, uniform concentric ridges; base rounded, slightly concavely 

 waved in front of the angle of the rostrum, corresponding to a marked 

 depression in front of an equally prominent ridge which extends from 



