40 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
Tindaria cervola Dali, 1916. 
Proc. U. S. N. M., 52:402. 
Shell small, thin, sub-triangular, of a uniform olive color, finely uni¬ 
formly concentrically sculptured, with a few microscopic radial striuke; 
base conspicuously arcuate, dorsal slopes nearly straight, the anterior 
slope shorter, the anterior end rounded, the posterior bluntly pointed, an 
extremely narrow and small lanceolate lunule and escutcheon, present; 
beaks conspicuous, the prodissoconch visible, whitish; about 10 anterior 
and 14 posterior teeth, the ligament small, wholly posterior. Length, 4; 
height, 2.7; diameter, 2 mm. (Dali.) 
Type in U. S. N. M., No. 215594. Type locality, Station 2923, off 
San Diego, California, in 822 fathoms. 
Range. Off San Diego, California, in deep water. 
Tindaria gibbsii Dali, 1897. 
Plate 43, fig. 2. 
Nat. Hist. Soc. Brit. Col. Bull. No. 2:10; plate 2, fig. 14. 
Shell small, thin, sub-equilateral, inflated, with a polished pale olive 
periostracum and smooth surface; anterior end shorter, rounded; posterior 
end very slightly recurved; beaks full, not arcuate, base arcuate; ligament 
wholly external, amphidetic, discontinuous below the beaks; interior bluish 
white, with a large rounded pallial sinus; anterior teeth 17, posterior 19, the 
line separated by a vacant triangular space on the hinge plate below the 
beaks. Length, 10; height, 6.5 ; diameter, 3.5 mm. (Dali.) 
Type in U. S. N. M. Type locality, off Queen Charlotte Islands, 
British Columbia. 
Range. Queen Charlotte Islands to the Coronado Islands. 
Tindaria mexicana Dali, 1908. 
Plate 39, figs. 6, 7. 
Bull. Comp. Zool., 42:389; plate 17, figs. 11, 14. 
Shell small, solid, round-triangular, sub-equilateral, olivaceous, pol¬ 
ished; beaks prominent, prosocoelous, slightly anterior, inflated, concen¬ 
trically minutely threaded; the sculpture extends to the middle of the base, 
is a little less conspicuous 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 dorsal slope flattish, the end rather 
abruptly rounded; base roundly arcuate; ligament minute, amphidetic; 
anterior hinge line with 11, posterior with about 21 teeth, the central ones 
small and obscure; interior porcellaneous. Length, 5.2; height, 4; diameter, 
2.3 mm, beaks behind the anterior end, 2 mm. (Dali.) 
