NEOZOIC INVERTEBRATES 



Modiolus (Botula?) sp. 



Locality. Upper beds, 3374. 



A small calcareous nodule from the shale contains part of the im- 

 print of a small, stocky, solid, strongly concentrically striated species 

 recalling, as far as its characters were evident, some of the species of 

 Botula. It has a length of about 10, and a height of 4 or 5 mm. 



Venericardia planicosta Lamarck. 



Venericardia filanicosta LAMARCK, Ann. du Museum, vn, p. 55 ; ix, pi. 31, 

 fig. 10, 1805. 



Localities. Upper beds, 3373 ; lower beds, 3377. 



Unmistakable fragments of this most characteristic Eocene type 

 were found in both upper and lower beds. They appear to be of the 

 ordinary form rather than the variety with obsolete sculpture dalled 

 kornii by Gabb. One imprint preserves the impression of the hinge 

 teeth. 



Phacoides? sp. 



Locality. Upper beds, 3373. 



An imperfect imprint of a shell which may be a Phacoides. It is 

 rounded with sculpture, recalling that of P. jamaicensis Lam., and 

 has a height of about 15 mm. 



Macrocallista (Chionella?) gilberti sp. nov. 



Pl. IX, fig. IO. 



Shell moderately convex, ovate trigonal, nearly equilateral, smooth ; 

 the beaks rather full and elevated, anterior end rounded, base arcuate, 

 posterior end somewhat longer, roundly pointed ; muscular impressions 

 obscure ; pallial sinus short, angular, free from the pallial line below. 

 Length 42, height 30, diameter about 12 mm. 



Locality. Upper beds, 3373. 



The hinge is inaccessible but this shell has the aspect of a Chi- 

 onella. It is named in honor of Mr. G. K. Gilbert, one of the geol- 

 ogists of the Harriman party. 



Macrocallista (Chionella) sp. 



Locality. Upper beds, 3375. 



This species is shorter and higher than M. gilberti and more 

 nearly orbicular in outline. It is about 33 mm. long, 28 mm: high, 

 and 20 mm. in diameter. The beaks are notably small and elevated. 



Tellina sp. 



Locality. Upper beds, 3373. 

 This species closely resembles in its outline Toldia $alachei, though 



