W. C. Knight — JVotes on the Genus Baptanodon. 81 



The most of the above information has been taken from 

 the S skeleton of the Wyoming collection, and I have found 

 it impossible to include this in the species already described 

 and for that reason propose the name of Bajptanodon Marshi^ 

 in honor of Prof. O. C. Marsh, who originated the generic name 

 Baptanodon. The accompanying figure of a front limb can be 

 considered as typical for this species. 



Some Measurements for Baptanodon Marshi. 



Huraerns. ^I- 



Length -190 



Prox. width -127 



Prox. thickness '080 



Distal width . _ -130 + 



Distal thickness '050 



Facet for ulna, length ._ 'OSO 



Facet for radius, length . _ _....- '050 



Facet for pisiforra, length. _ -010? 



Ulna, 



Width -069 



Length _ _ - '054 



Radius, 



Width -065 



Length -046 



Pisiform, 



Width. _ .- -036 



Length '054 



Coracoid, 



Length 



Width _ 



Median facet, 



Length -123 



Width . ._ -081 



In comparing Baptanodon with Opthalmosaurus it will be 

 well to consider that in Baptanodon the interclavicle is either 

 rudimentary or wanting, the absence of the intercentra between 

 the second and third vertebrae, the development of the large 

 facets upon the interior margins of the coracoids, the striking 

 differences in the development of the limbs, causing Baptano- 

 don to have been a much more powerful swimmer than its 

 European ally. 



Geological Laboratory, University of Wyoming. 



Am. Jour. Sci.— Fourth Series, Vol. XVI, No. 91.— July, 1903. 

 6 



