C. W. Gilmore — New Species of Baptanodon. 193 



Art. XVIII. — A New Species of Baptanodon from the Juras- 

 sic of Wyoming ', by Charles W. Gilmore. 



During the summer of 1905 Mr. W. H. Reed, Curator of 

 the University of Wyoming museum, found what appears to 

 be the -most complete skeleton of Baptanodon yet obtained 

 from the marine Jurassic of this country. 



Through the kindness of Mr. Reed the important parts of 

 this specimen were submitted to the writer for study and 

 description. Characters observed in the teeth and anterior 

 extremities indicate a new species, for which the name Bap- 

 tanodon reedi is proposed, in recognition of Mr. Reed's many 

 discoveries in this formation. 



Baptanodon reedi sp. no v. 



Char. Specific : Distal end of humerus oroad and articulat- 

 ing completely with radius, ulna, and pisiform. Teeth of 

 large size and extending the full length of the jaws. Sclerotic 

 ring small in proportion to length of skull. 



The type specimen, designated as D.B. in the University of 

 "Wyoming collection, was found in the Dutton Creek Basin, 

 Fremont Co., Wyoming. It occurred in the same horizon of 

 the marine beds and only a few hundred feet distant from the 

 place where the type specimen of Megalneusaurus rex* was 

 found. This horizon Knight considered the uppermost band 

 of the Shirley f stage, and the stratigraphic position is quite in 

 accord with the highly specialized features observed in the 

 skeletal structure of this specimen. 



The type of the present species consists of one-half of the 

 skull (divided longitudinally), one hundred and fifty-three 

 vertebrae in series beginning with the atlas, numerous ribs, 

 proximal part of the left scapula, both humeri, and the proxi- 

 mal portion of the left pectoral extremity. 



The writer has had no opportunity of examining more of 

 the skull than the sclerotic ring of one orbit and the anterior 

 portion of the rostrum, and only the parts studied will be con- 

 sidered in this paper. However, a photograph of the right 

 side shows a general resemblance to the other Baptanodon 

 skulls known. 



The sclerotic ring is remarkably free from distortion and 

 gives a clear conception of the arrangement of the bony plates, 

 which constitute the protective covering of the eye. The ring 



* W. C. Knight, this Journal, vol. v, May, 1898. 



fW. C. Knight, Bulletin Geol. Soc, of America, vol. xi, May, 1900, p. 385. 



Am. Jour. Sci.— Fourth Series, Vol. XXIII, No. 135. —March, 1907. 

 14 



