DESCRIPTION OF TWO NEW SPECIES OF FOSSIL 

 TURTLES, FROM THE LANCE FORMATION OF WYO- 

 MING. 



By Charles W. Gil>more, 

 Assistant Curator of Fossil Reptiles, United States National Museum. 



Among the fossil specimens obtained by the late J. B. Hatcher in 

 the Lance formation of Wyoming, for the United States Geological 

 Survey, were a number of extinct turtles. Two of these are found to 

 represent undescribed si^ecies, and they form the subject of the present 

 paper. 



BAENA HAYI, new species. 



Type. — No. 6728, U. S. N. M., consists of a nearly complete carapace 

 and plastron. Portions of the posterior lateral margins are the only 

 important parts missing. Collected by J. B. Hatcher in the year 

 1890. 



Locality. — Lance Creek, Niobrara County (formerly a part of 

 Converse County), Wj^oming, 



Horizon. — Lance formation. Upper Cretaceous or Lower Tertiary. 



Two species, pertaining to the genus Baena^ B. hatcheri Hay and 

 B. Tnarshf Hay, have been described from the Lance formation, and 

 a third species is now recognized in the present specimen, for which 

 the name B. hay I is proposed. It is named in honor of Dr. O. P. Hay, 

 of the Carnegie Institution, in recognition of his valuable contribu- 

 tions to our knowledge of the fossil turtles of North America. 



The t3'pe of the species is a very complete specimen, that may at 

 once be distinguished from the other species of the genus by the great 

 breadth of the shell as compared with its length. It is the only 

 Baena known at the present time in which the breadth exceeds the 

 length. The greatest length of the carapace in a straight line is 292 

 mm. ; its width is at least 320 mm. ; the height from the bottom of the 

 plastron is 85 mm., but in life it was probably greater, as the plastron 

 at the center is someAvhat crushed in toward the carapace. 



The greatest breadth of the carapace is behind the inguinal notches. 

 The posterior border is unusually broad and the lateral portions but 



Proceedings U. S. National Museum, Vol. 50— No. 2137. 

 10600°— Proc.N.M.vol.50— 16 41 641 



