290 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. [1885. 



A LIST OF THE MESOZOIC AND CENOZOIC TYPES IN THE. COL- 

 LECTIONS OF THE U. S. NATIONAL MUSEUM. 



By JOHN BEIiKIVAP JTIARCOU. 



Tbis list contains all the original types that I have been able to find 

 in the collections of the National Museum. Many of the original labels 

 have been lost or misplaced, and reideutification has frequently been 

 necessary. This work has often been attended with some diflBculty, owing 

 to unsatisfactory descriptions and inaccurate figures. Many of the 

 types which should be here have disappeared, sometimes altogether, 

 l)ut sometimes only one or more of the type specimens have* been lost 

 and the remainder found. All the specimens mentioned in this list have 

 been carefully compared with the descriptions and figures referred to, 

 they have been accurately and safely labeled, and can be seen at the 

 ^National Museum. It is very probable that a few more of these type 

 specimens may be found during the arrangement of the remainder of 

 the collections, but only very few can be found in this way, as all the 

 drawers have been searched especially for them. A small piece of green 

 glazed paper has been pasted on every figured side of a specimen, and 

 the Museum number, corresponding to a copy of the label in the Mu- 

 seum register, has been painted on every specimen; when the fossils are 

 too small to admit of this, they have been inclosed in a glass tube and the 

 number i)ainted on it. The label contains the formation and locality, in 

 addition to the information given in this list. I have not attempted to 

 give the different horizons at which the fossils occur, as these are often 

 very Hilcertain, except in a few instances in the Cretaceous, where they 

 liave been given according to Messrs. Meek, White, and Whitfield. I 

 am nnder obligations to Dr. 0. A. White, without whose knowledge of 

 the collections it would have been impossible for me to identify many 

 of the types recorded here. 



LIST OF THE WORKS REFERRED TO. 



Bull. U. S. Geol. & Geogr. Surv. Terr. ^Bnlletin of the United States Geological and 

 Geographical Survey of the Territories, F. V. Hayden, U. S. geologist in charge, 

 Washington, D. C. 



iSuIL U. S. Geol. Surv. = Bulletin of the United States Geological Survey, Washing- 

 ton, D. C. 



nth Ann. Rep. U. S. Geol. & Geogr. Surv. Terr. = Eleventh Annual Report of the 

 United States Geological and Geographical Survey of the Territories, Washing- 

 ton, D. C. 



Geol. Surv. California, Geology, Vol. I = Geological Survey of California, Geology, 

 "Volume I, Report of Progress and Synopsis of the Field- Work from 1860 to 1864, 

 by J. D. Whitney, State geologist, Philadelphia, Pa. 



Pal. Upper Missouri, <^Smithsonian Cont. to Know. 172 = Palaeontology of the Upper 

 Missouri, Smithsonian Contributions to Knowledge No. 172, Washington, D. C. 



Proc. Acad. Nat. Sci. Philad. == Proceedings of the Academy of Natural Sciences of 

 Philadelphia, Philadelphia, Pa. 



