224 ANNAL8 ^'EW YORE ACADEMY OF SCIENCES 



Sanguinolites simulans sp. nov. 



Sliell rather small, very transverse, suhelliptical. Convexitj' moderate. 

 Umboual ridge uot very prominent, but very distinct. Post-cardinal slopes 

 compressed. Beaks small, strongly incurved, situated near the anterior ex- 

 tremity. Cardinal line long, apparently over two thirds the entire width, 

 nearly straight. Lower border gently convex, nearly parallel to the hinge, 

 bending upward more strongly behind. The short anterior end is strongly 

 rounded beneath the beak. The posterior outline is doulily truncated, the 

 lower truncation being nearly vertical and the upper slightly oblique, so as to 

 make an obtuse angle with the hinge. There appears to be a small but dis- 

 tinct lunule, while the shell back of the beaks is sharply inflected so as to 

 form an elongated escutcheon the entire length of the hinge line. 



The shell is thin, and the surface is marked by strong, regiilar, subequal, 

 concentric plications, extending from the front to the umbonal ridge. At the 

 umbonal ridge they abruptly cease, the post-cardinal slope being marked by 

 much finer, less conspicuous strinp, which are. however, stronger and coarser 

 than growth lines. The umbonal ridge is an angular plication. A second 

 somewhat similar radiating line divides the post-cardinal slope about midway. 

 It is scarcely distinguishable as an elevation, however, though very noticeable 

 as a line along which the strife and the posterior outline abruptly change 

 direction. 



Sphenotus branneri sp. nov. 



Shell small, transversely subovate, strongly contracting toward the front. 

 Greatest width about twice the greatest height or a little more. Convexity 

 strong. Umbonal ridge indistinct. A constriction more or less pronounced 

 passes across the shell, meeting the lower border a little anterior to the mid- 

 dle. The beak is small, strongly depressed and almost terminal. The cardinal 

 line is nearly straight or gently convex, about three fourths of the entire 

 width. The lower border converges with it toward the front, having a slightly 

 sinuous course. The posterior outline is strongly and rather regularly rounded, 

 sometimes more or less straightened or obliquely truncated above. The an- 

 terior outline below the almost terminal beaks is narrow and strongly rounded. 



The surface is marked by radiating plications or costje. which are confined 

 to the posterior portion back of the constriction. The highest of the plications 

 marks an inflection of the shell near the hinge to form a long, rather broad 

 escutcheon. Below and anterior to this, there are about nine regularly dis- 

 posed cost,ie. diminishing in strength toward the front. Where well preserved, 

 the surface shows traces of fine radial lirte intermediate with the costfp. In 

 most specimens, these and all but three or four of the costre are obscured. 

 There are also numerous concentric strife and sharp, regular, concentric lirre. 



The internal characters are unknown, save that some specimens show a 

 large anterior scar. 



Sphenotus washingtonense sp. nov. 



Shell of medium size, subquadrate. very transverse. Greatest width dis- 

 tinctly more than twice the greatest height. Cardinal line straight, somewhat 

 longer than half the greatest width. Lower margin subrectilinear and par- 



