388 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
entire; hinge with seven to eight anterior and eighteen to twenty posterior hinge 
teeth, small below the beaks, but forming an apparently continuous arch with no 
central gap. Length of shell, 5.5; alt. 4.5; max. diam. 3.0 mm. 
A few dead valves and fragments dredged in Mid-Pacific, off Salar y Gomez 
Island, at U. S. S. “ Albatross,” station 4693, in 1142 fathoms, manganese 
nodules, bottom temperature 359.4 F. 
This species is more nuculiform than any of the other described species. 
Tindaria panamensis DALL, n. sp. 
Plate 17, figures 10, 12. 
Shell small, not polished, veneriform, evenly, closely, concentrically threaded, 
the grooves sharp; dark olivaceous green, darker near the margin, very thin, the 
valves slightly compressed at the posterior third, behind which the sculpture be- 
comes suddenly finer; beaks low, plump, rather anterior, with no lunule and only 
a narrow, feebly defined escutcheon; ends rounded, the base arcuate with a faint 
inflection at the point of compression, ligament small, almost imperceptible; hinge 
with seven anterior and about thirteen posterior teeth; margins entire; ends sub- 
equally rounded. Lon. 5.5; alt. 4.3; max. diam. 2.8; beaks behind the anterior 
end, 2.0 mm. 
U. S. S. “ Albatross,” station 3392, Gulf of Panama, in 1270 fathoms, hard 
bottom, temperature 36°.4 F. U. 5. N. Mus. 122,922. 
Of a more greenish color and dull surface than any of the previously described 
veneriform species. 
Tindaria atossa DALL, n. sp. 
Plate 15, figures 3, 4. 
Shell small, olivaceous, moderately polished, finely concentrically striated all 
over, with the beaks slightly anterior, the posterior end bluntly pointed, the an- 
terior rounded ; ligament small, amphidetic; anterior teeth six, posterior ten, the 
dorsal slopes gently, the basal margin roundly, arcuate ; interior white, margin 
entire. Lon. 3.5; height, 2.2; max. diam. 1.7; beaks behind the anterior end, 
1.7 mm. 
U.S. S. “ Albatross,” station 3393, Gulf of Panama, in 1020 fathoms, mud, 
bottom temperature 369,8 F. U. S. N. Mus. 122,924. 
Resembling the last species, but with the whole surface sculptured and the 
posterior end less elongated and pointed. 
At station 3392, Gulf of Panama, in 1270 fathoms, hard bottom, temperature 
369.4 F., was found another specimen, U. S. N. Mus. 122,920, which is ap- 
parently the adult form. It resembles the smaller ones above described, but 
measures: lon. 6.5; alt. 4.5; max. diam. 3.0; beaks behind anterior end, 
2.5 mm. Since this is considerably larger than the specimens above referre 
to, it will be considered as the type. 
