388 



BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



This goose had longer legs and probably larger dimensions than any 

 of the existing North American species. It was discovered in the same 

 locality as the last species by Professor Thomas Condon, of Eugene 

 City, Greg. 



Cygnus paloregonus, sp. nov. 



Represented by numerous bones, especially by four tarsometatarsi, 

 two of which are nearly perfect. These indicate a species of the size of 

 those now existing on this continent, but different from them. The 

 characters of the three species are contrasted in the following table: — 



Shaft 



Posteriorly... 



Inner side 



Outer side 



Hypotarsal crests 



Cotyli 



Distal tendinous 



foramen. 

 External side dis- 



tally. 



G. buccinator. 



More slender 



Slightly convex : no ridges 



Flat proximaUy 



Proximal concavity deep . - 



Third crest not descending 

 below foramen ; longer 

 than second; fourth not 

 reaching foramen . 



Outer larger than inner, 

 well separated from in- 

 ner by a narrow deep 

 space ; posterior facet 

 not distinct. 



SmaU... 

 Smooth . 



0. paloregonus. 



More robust 



Convex ; two rough lateral 

 and a narrow median 

 ridge. 



Convex proximally 



Proximal concavity deep . . 



Third crest reaching below 

 foramen, longer than 

 second ; fourth sending 

 keel over foramen. 



Outer not larger than in- 

 ner, separated by a wide 

 open space ; posterior 

 facet not distinct. 



Large . . 

 Kidged . 



O. americanus. 



More robust. 



Concave; two lateral ridgos. 



Convex proximally. . 



Proximal concavity deep. 



Third crest not reaching 

 below foramen, equal 

 second ; fourth reaching 

 foramen. 



Outer considerably larger 

 than inner, transverse, 

 separated by a shallow, 

 little marked space ; pos- 

 terior facet quite dis- 

 tinct. 



Least. 



Smooth 



The lateral ridges which bound the posterior face in this species, 

 which are wanting in G. huccinator but present in C. americanus, are 

 strongly convex backward, so as to narrow their interspace in a manner 

 not seen in either of the recent species. Their divergence at the ex- 

 tremities causes, in the proximal end of the bone, that the posterior 

 face is considerably wider than in the C. buceinator. 



Measurements. 



M. 



Length of tarsometatarsus 0.115 



r proximally 0.025 



Transverse diameter <j medially 0.011 



l^distally 0.024 



^ . ■,. ^ S medially 0.010 



Antero-posterior d^^meter.^ ^^^.^^^^^ ^^^^^^^^ ^ ^^g 



For the opportunity of studying the osteology of the existing birds of 

 North America, I am indebted to the Smithsonian Institution. The 

 specimens of the Oygnus buccinator and C. americanus which I have ex- 

 amined are the Nos. 8033 and 11093 of the Smithsonian Catalogue, 

 respectively. 



This swan was discovered: by Ex-Governor Whitaker, of Oregon, in 

 the Pliocene formation of that State. The same bird was afterward 



