60 REPORT OF THE SECRETARY. 



cate specimens for exchange. All the invertebrate fossils at present in 

 the possession of the Museum have thus passed under a preliminary 

 examination by Dr. White. 



Among the results of the investigation of the invertebrate fossils may 

 be mentioned the recognition of Productus giganteus Martin, in a collec- 

 tion obtained by the United States Fish Commission at McCloud River, 

 Cal., which species was not previously known to occur in American strata; 

 the recognition of StricJdandinia salteri and 8. davidsoni Billings, among 

 some Upper Silurian fossils brought from Northern Georgia by Lieut. 

 A. W. Vodges, which two species had hitherto been found only in the 

 island of Anticosti. 



As already stated, the fossil plants have been referred to Prof. Leo 

 Lesquereux for classification, which work is now in progress and in 

 large part comjileted, the specimens as fast as they were labeled having 

 been returned to the Museum. The greater part of the vertebrate fos- 

 sils have not yet been investigated, bat a considerable number of boxes 

 received from Capt. G. M. Wheeler contain the types of vertebrate forms 

 which were described and figured by Professor Cope in Volume lY 

 Explorations and Surveys west of the 100th Meridian. 



A large proportion of these paleontological collections, vertebrates 

 invertebrates, and plants, consists of the type specimens upon which 

 species and genera have been founded, and many other species and 

 genera are rej)resented among these collections by authentic examples. 

 Among them are the types of the greater part of the species which 

 have been published in the reporJ,s of the different explorations and 

 surveys by authority of the general government, and by the Smithso- 

 nian Institution and National Museum. 



The following is a list of the titles of the articles from the pen of Dr. 

 White, based on the museum collections, which have been published in 

 the Proceedings: 



Descriptions of new species of invertebrate fossils. 

 Note on Endothyra ornata. 

 Note on CHocardium and Ethmocardium. 

 Descriptions of New Cretaceous Invertebrate Fossils from Kansas and 



Texas. 

 Note on the Occurrence of Productus giganteus in California. 

 Note on Acrothele. 



Description of a New Cretaceous Pinna from New Mexico. 

 Note on StricJclandinia salteri and aS^. davidsoni in Georgia. 

 Description of a very large Fossil Gasteropod from the State of Pueblo, 



Mexico. 

 Descriptions of New Invertebrate Fossils from the Mesozoic and Ceno- 



zoic rocks of Arkansas, Wyoming, Colorado, and Utah. 



Distribution of duplicate specimens. — It is a question whether any 

 museum has ever made so systematic, thorough, and extensive a disposal 



