74 7he Saint Peter Sandstone. 



TelUnomya novicia n. sp. 

 Plate III, figure 3. 



Length about 12 mm, bredth 8 mm, convexity of a single valve 3 mm. 

 The beaks are prominent, curved, situated about one-third the length from 

 the anterior end, and directed a little forward. Between the beak and the 

 ventral margin the convexity is strong but uniform, while anteriorly and 

 in the postero-dorsal direction the convexity is abrupt, giving the cast a 

 triangular appearance. The hinge is about 8 mm long, curved and elevated 

 posteriorally so as to form a concave surface below it. The pallial line is 

 simple and well marked. The anterior muscle scar is large, round and 

 placed midway below the beak, and tangent to the pallial time, which 

 vseems here to form a sort of clavicle. Posterior scar not distinct. 



Found at South Saint Paul and Dayton's Bluff. 



TeUinomya absimilis n. sp. 

 Plate III, figures 1 and 2. 



Length about 20 mm, bredth 10 mm. Beaks anterior, small and 

 curved close down to the hinge. Hinge, posterior to the beaks, is nearly 

 straight and is long; anteriorally it is short and curved down, in continua- 

 tion with the anterior margin, which is nearly straight above but curved 

 abruptly back below forming an acutely rounded antero-ventral pro- 

 jection. The ventral margin is gently convex for the anterior half, gently 

 concave to the posterior extremity, but in general direction is parallel to 

 the cardinal line. The posterior margin is nearh^ straight, is well marked 

 off from the ventral and dorsal, and forms an angle of about 110° with 

 the latter. The point of greatest convexity is at the umbones anterior to 

 the strong acutely rounded umbonal ridge which runs obliquely back 

 forming the postero-ventral angle and giving a convex slope to the 

 postero-dorsal and postero-ventral portions of the shell. Below the 

 umbones the shell is strongly and evenly convex. The shell was thin and 

 marked by fine plications which radiate from the umbonal ridge. The 

 dentition is that of a TeUinomya. but not distinctly preserved. 



Highland Park. 



GASTEROPODA. 



Genus Holopea. 



Holopea cf. obi jqua HaW . 



Plate III, figure 5. 



Compare Natica (species undetermined) Hall 1847, Pal.N. Y., vol. 1, 



p. 42, pi. 10, fig. 4, and Holopea obliqua Hall 1847, Pal. N. Y., vol. 1, p. 



107, pi. 37, fig. 2. 



Small, of about three or four volutions, the last of which forms the 

 main body of the shell. Volutions evenly ventricose above. Sutures well 

 marked. No umbilicus. Surface with ridges of growth \\Aiich run directly 

 transverse. Apical angle about 115°. Three specimens have been found 

 all of which are imperfect. There is no umbilicus, but in other respects 



