388 bulletin: museum of comparative zoology. 



entire ; hinge with seven to eight anterior and eighteen to twenty posterior tinge 

 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 35°. 4 F. 



This species is more uuculiform 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 tliin, the 

 valves slightly compressed at the posterior third, behind which the sculpture be- 

 comes suddenly finer ; beaks low, plump, rather anterior, with no lunnle and only 

 a narrow, feebly defined escutcheon ; ends rounded, the base arcuate with a faint 

 inflection at the poiut 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. S. 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, flgurea 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 rouudly, arcuate ; interior white, margin 

 entire. Lon. 3.5; heiglit, 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 3C°.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 

 36°. 4 F., was found another specimen, U. S. N. Mus. 122,920, which is ap- 

 parently the adult form. It resembles the smaller cues above described, but 

 measures: lou. 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 referred 

 to, it will be considered as the type. 



