230 ANNALS NEW YORK ACADEMY OF SCIENCES 



wing is small, depressed, oblique and undefined ; the anterior wing larger, 

 more abruptly depressed and therefore more sharply defined. 



The sculpture consists of rather indistinct, subequal, radiating cost;p. be- 

 coming finer and fainter toward the sides, which, with the wings and umbonal 

 portion, appear to be uncostate. The costae are relatively broad and flat and 

 the striae between them narrow and shallow. Concentric markings are indis- 

 tinct or absent. 



Cypricardella subalata sp. nov. 



Shell small, subquadrate, transverse. Width about 1.5 times the height. 

 Beak prominent, about one third the width posterior to the margin. Hinge 

 line straight, two thirds of the width. Lower margin gently convex, nearly 

 parallel to the hinge. Posterior outline almost vertically truncated, the pos- 

 terior cardinal angle being if anything rather acute than obtuse. Lower mar- 

 gin bends up strongly in front to about one half the height, from which point, 

 by an abrupt change of direction, the outline becomes concave to the beak. 



The convexity is moderate to low. There is no distinct umbonal ridge. 

 The post-cardinal portion is, howevei'. somewhat compressed, and a faint con- 

 striction crosses the shell to about the middle of the base. Probably there is 

 a well-defined lunule beneath the beak. 



The surface is marked by relatively coarse, deep, regular strife, separated 

 by thin lamellose ridges. In the type, this sculpture dies out along the line 

 where the umbonal ridge should lie. and the post-cardinal slope is crossed only 

 by very fine striae, but in other specimens it appears to be persistent to the 

 hinge line. 



Euconospira disjuncta sp. nov. 



Shell of medium size. Maximum diameter 23 mm. Height 20 mm. Volu- 

 tions about 7. gradually enlarging. LTmbilicus small, open (?). Peritreme 

 section very transverse, subrhomboidal, gently concave on the upper interior 

 side, nearly straight on the upper exterior side, gently convex on the lower 

 exterior side and strongly convex on the lower interior side. The upper 

 interior surface slopes gently downward; the upper exterior surface slopes 

 strongly downward in the opposite direction, and the lower exterior surface 

 slopes gently downward. The periphery is therefore acutely angular and 

 carries a narrow slit band defined by sharply projecting edges. The volutions 

 do not embrace quite to the slit band, so that the conical shape of the shell, 

 as a whole, is broken into steplike descents. The peripheral portion on which 

 the slit band occurs is rendered more or less carinate by two relatively narrow 

 sulci, one above and one below, of which the latter is the more conspicuous, 

 because of being more distinctly defined on its outer side, where there is a 

 fairly distinct shoulder. It is up to this shoulder that each volution embraces 

 the preceding one. 



The surface is marked by regular transverse stri.np having a gently convex 

 curvature and a strong backward direction. On the lower surface of the 

 peritreme. they have a sigmoidal curve, concave toward the band and convex 

 toward the umbilicus. They also have a strong backward sweep, so that the 

 aperture is very oblique. In crossinc: the slit band, they make strong, regular 

 crenulations. which do not extend onto the elevated edges of the band. Traces 

 of revolving lines are present also, especially on the lower surface. 



