194 



Green Sand or Cenomanien. In the United States it is said to be most 

 frequently met with in the Niobrara Division, but it is also sometimes 

 found in the Fort Benton Group. 



2. — From the Coarse Conglomerates, or Subdivision B. op Dr. G. M. 



Dawson's Eeport, 



The only fossil yet obtained from these conglomerates is a worn 

 fragment of the guard of a Belemnitc Avhich it is impossible to deter- 

 mine specifically. 



3. — From the Lower Shales and Sandstones, or Subdivision C. of 

 Dr. G. M. Dawson's Eeport. 



CEPHALOPODA. 



Belemnites densus, Meek and Hayden. 

 Plate 22, fig. 1. 



9 



Belemnites densus, Meek & Hayden. — 1858. Proceedings of the Academy of 



Natural Sciences of Philadelphia, p. 58, 

 and do. for 1860, p. 418. 

 " " — 1865. Palseontology of the Tipper Missouri, 



p. 126, pi. 4, figs. 10 a, b, c, and PL 5, 

 figs. 1 d, r,f, coet. exclus. 

 " " Meek. — 1876. Simpson's Report on Explorations 



across tlie Great Basin of Utah, Rep. 

 on the Palaeontological colections, p. 

 358, pi. 3, figs. 4 a, h. 



Belemnites, Sp. TJndt. — This volume, p. 11, woodcut fig. 1, and 



pi. 1, figs. 1, la, 16 and Ic. 



Guard comparatively short and thick, increasing rapidly in breadth 

 from the point to a distance of about one-half or three-quarters of an 



