Paleontology 683 



to be regarded as appearing in the joint names of Meek and 

 Hayden, while the descriptions of the genera and families, 

 and the discussion of their relations, geological range, and 

 geographical distribution, are by Meek. 



From 1865 to 1878 there is another period during which 

 paleontological publication ceased. During this time, how- 

 ever, specialists in this province were not idle. Dall was 

 working up the Plistocene and other Tertiary invertebrate 

 fauna of California, and his results, embodied in three sepa- 

 rate papers, were published in 1878 in the "Proceedings." 

 Later communications by Dall to the same medium, entitled 

 "A Subtropical Miocene Fauna in Arctic Siberia," "A Mono- 

 graph of the Genus Gnathodon, Gray (Rangia, Desmoulins)," 

 and " New Tertiary Fossils from the Southern United 

 States," appeared respectively in 1893, 1894, and 1895. 



The Miocene fauna, referred to in the first of these papers, 

 included six species of fossil shells, of which five were new 

 and belonged to the following genera : Semele, Siphonaria 

 Conus, Cerithium, and Diloma. They were assigned to a 

 Miocene age. Faunally, the species point to a distinct anal- 

 ogy with those of the China and South Japan seas. 



While Dall's work was in progress the Paleozoic and 

 Mesozoic material collected by the museum from the south- 

 ern and western United States was being studied by Charles 

 A. White. The results of his work were published in the 

 "Proceedings" from 1879-1894. 



Heilprin's "Eocene Mollusca" appeared in 1880. It con- 

 tains descriptions of species from southern United States, 

 now in the National Museum. 



In 1888 the publication of Walcott's brilliant series of 

 papers on the Cambrian and pre- Cambrian fauna was begun, 

 and continues up to the present. The first of the series 

 contains descriptions of thirteen species and varieties, referred 



