254 REPORT ON ALBATROSS MOLLUSCA DALL. 



Malletia (Tindaria) virens sp. nov 

 Plate xin. Fig. 3. 



Shell small, inflated, thin, closely, minutely, concentrically ridged, 

 with a green or olive-green epidermis; anterior end shorter; base evenly 

 rounded, beaks full but not prominent; outline of the shell recalling 

 Callista; anterior end eveuly rounded, posterior produced, with a very 

 obtuse rounded point, not rostrate; ligament under tbe beaks, but 

 extending further behind than in front of them, wholly external to the 

 tooth line, which is continuous below it ; anterior teeth eight, posterior 

 ten, with three or four undeveloped additional teeth under the beaks 

 on each side; teeth prong shaped; scars obscure, pallial line invisible; 

 shell very thiu, cardiual margin very weak aud narrow. Maximum 

 lougitude 4.5 ; altitude 3.5 ; diameter 2.5 ; vertical of the beaks, 2 mm 

 from tbe front margin. 



Hab.— Stations 2781, 2782, 2783, and 2785, in 122 to 449 fathoms, mud, 

 on the west coast of Patagonia ; temperatures 47° to 50° F. 



This species is exceptional for its thin shell aud very green epidermis 

 I have not been able to distinguish any lunular area or escutcheon. 



Genus YOLDIA Morch. 



Yoldia scapania sp. nov. 



Plate xin, Fig. 6. 



Shell elongated, polished, smooth, whitish with a pale yellowish 

 epidermis, the beaks very inconspicuous, hardly raised above the level 

 of the slightly augulated hinge-line; base nearly straight ; the anterior 

 end rounded above, more oblique toward the base ; the beaks slightly 

 more than one-third of the way from the anterior to the posterior end ; 

 posterior end bluntly rounded as in a Siliqua ; interior smooth, white, 

 with a deep rounded pallial sinus and rather large rounded muscular 

 scars; hinge with about twenty-eight very small V-shaped posterior 

 and twenty -five anterior teeth, the anterior ones being crowded more 

 closely; there is a greater difference in the length of the hinge-line on 

 each side of the ligament pit than the numbers would imply ; ligament 

 wide, low, subtri angular, wholly internal; margins of the valves 

 smooth, sharp ; maximum longitude of shell 18.25; altitude 9; diame- 

 ter 5.6 mm . 



Hab.— U. S. Fish Commission Station 2762, east of Eio Janeiro, in 59 

 fathoms, mud ; bottom temperature 57° F. 



This species is remarkably soleuiform, gaping slightly at either end, 

 mostly at the posterior end ; it is very evenly inflated and the beaks 

 are so inconspicuous as to be practically almost indiscernible. It is 

 most like Y. solenoides Dall, which is smaller, has the posterior end less 

 blunt and slightly narrower ; is a smaller shell, with more central 

 umbones and a few concentric grooves near the base. In the present 



