288 PROCEEDINGS OF THE XATlOyAL MUSEUM. vol.52. 



mens. From the Miocene of Florissant, Colorado, quantities of Amy- 

 zon remains, and from corresponding strata in Esmeralda County, 

 Nevada, large numbers of Leuciscus skeletons have been added to 

 the collection. There is also an abundant representation of Eocene 

 and Miocene ichthyic remains from the Atlantic coast region, and 

 from foreign Tertiary horizons mention should be made of a number 

 of fine slabs from the Upper Eocene of Monte Bolca, in northern Italy. 

 In the following pages some of Cope's types which have not previously 

 been figured receive attention, and two or three ncAV species of Ter- 

 tiary fishes are described. 



Family OSTEOGLOSSIDAE. 



This family, first appearing in the Eocene, is represented by sev- 

 eral modern genera, two of which, Osteoglossum * and Arapaima, are 

 fomid in South American rivers. Heterotis is a tropical African 

 genus. The skull in this group has a distmctly primitive appearance, 

 the superficial bones bemg thinly covered by skin and havmg a sculp- 

 tured surface. The wide nasals, frontals, and parietals meet in the 

 middle fine, and the supraoccipitai scarcely reaches the surface. Both 

 the premaxilla and maxilla are toothed, and share in formmg the mar- 

 gin of the mouth; there is no supramaxiUa. The suboperculum is 

 small, often hidden behind the preoperculum, and fikewise the inter- 

 operculum (Goodrich). 



Genus DAPEDOGLOSSUS Cope. 



Syn. Phareodus Leidy (undefined). 

 The largest and best kno\^^l species of this genus is D. testis Cope, 

 from the Green River Eocene of Wyoming, of which beautifully pre- 

 served specimens exist in the United States National Museum, and in 

 the American Museum of Natural History, New York. One nearly com- 

 plete skeleton m the latter institution is instructive for having the bones 

 of the skull partly dissociated and displayed to excellent advantage 

 for study. It is catalogued as No. 4587. Through comparison with 

 this specimen it has been possible to identify positively the isolated 

 skull shown in plate 16, figure 1, as belonging to this species. This 

 well-preserved cranium is the property of the United States National 

 Museum (Cat. No. 4916), and has been carefully prepared so as to 

 reveal the underside, freed from the matrix. Its primitive charac- 

 ters are evident, and among surviving genera the resemblance is 

 closest to Heterotis of tropical Africa. 



1 For an investigation of the cranial osteology of this genus, see the following: Bridge, T. W. On certain 

 features of the skull in Osteoglossum formosum. Proc. Zool. Soc. London, 1895, pp. 302-310.— Ridewood, 

 W. G. On the cranial osteology of the fishes of the families Osteoglossidae, Pantodontidae, and Phracto- 

 laemidae. Joum. Linn. Soc. Zool., vol. 19, 1905, pp. 252-282. 



