DALL: MOLLUSCA AND BRACHIOPODA. 387 



base at a bluutly rounded angle, the base being nearly straight and the whole 

 profile of the shell subrectangular ; interior translucent whitish, scars perceptible, 

 the pallial sinus shallow, rounded in front; hinge plate straight with about four- 

 teen anterior and over thirty very small anterior teeth, the gap separating the 

 two series very slight. Lon. of shell, 13.0 ; of beaks behind the anterior end, 

 5.5; alt. 8.0; diam. 5.0 mm. 



U. S. S. " Albatross," station 3360, Gulf of Panama, in 1672 fathoms, sand, 

 bottom temperature 42° F. U. S. N. Mus. 122,908. Also off the coast of 

 Ecuador, at station 2793, in 741 fathoms, mud, temperature 38°. 4 F. 



TIIVDARIA Bellardi. 

 Tindaria compressa Dall, n. ep. 



Plate 15, flgures 7, 8; Plate 17, figures 15, 16. 



Shell small, thin, cythereiform, pale yellow, moderately convex, inequilateral, the 

 anterior end shorter, the entire surface minutely, evenly, concentrically striated; 

 beaks low, prosocoelous, with no defined lunule but a flattish space in front of 

 them ; ligament small, ampliidetic ; posterior slope slightly arcuate, with a long 

 lanceolate escutcheon, defined by an impressed line ; anterior and posterior ends 

 rounded, base evenly arcuate ; interior white, porcellanous ; hinge with about ten 

 anterior and twenty-one posterior teeth, a rather wide mesial gap, between the 

 two series ; basal margin entire. Lon. 8.2 ; height, 6.0 ; max. diam. 4.3 ; beaks 

 behind the anterior end, 3.0 mm. 



U. S. S. " Albatross," station 3360, in 1672 fathoms, sand, bottom temperature 

 42° F. U. S. N. Mus. 122,921. 



A larger specimen of the same species, but with twelve anterior and twenty- 

 five posterior teeth, measures: lon. 11.5; alt. 8.5; diam. 6.0; and the beaks 

 behind the anterior end, 4-7 Dim. It was dredged at station 3414, southwest of 

 the isthmus of Tehuantepec, in 2232 fathoms, green mud, bottom temperature 

 38°.5 F. U. S. N. Mus. 122,923. 



This species recalls Tindaria amabilis Dall, of the Antilles, by its form and 

 color, but it is less solid and inflated, and more attenuatedly compressed behind. 

 In the former species the ligament is nearly equally distributed iu front of and 

 behind the beaks, but iu T. compressa the larger part is posterior. 



Tindaria salaria Dall, n. sp. 



Shell pale cream color or white, nuculiform, smooth on the beaks, near the dor- 

 sal slopes and ends of the shell; basally concentrically striated, polished ; the shell 

 is very nearly the sliape of a small Nucula proxima Say ; ligament small, aniphi- 

 detic, mostly posterior; resiliuni obsolete or none ; there is no trace of a chondro- 

 phore; hinge line arched, with no lunule, the escutcheon narrow, long, feebly 

 defined ; interior white, porcellanous, polished ; pallial line not siuuated, margins 



