EEPTILIA OF KIETLAND FORMATION GILMORE 165 



Order CHELONIA 



Four families of Chelonia, the Pleurosternidae, Baenidae, Derma- 

 temydidae, and Trionychidae, are now recognized in the Kirtland 

 formation. Eleven species have been named, four of which are 

 herein described as new. 



Family PLEUROSTERNIDAE 



NEURANKYLUS BAUERI Gilmore 



A single specimen (U.S.N.M. no. 13228), collected by the 1929 

 expedition, is referred to this species. It is considerably larger 

 than the type specimen, the carapace measuring 605 mm in length 

 on the median line, whereas the type is only 560 mm in this dimen- 

 sion. Except for its large size, the specimen contributes little to 

 our knowledge of this species, as most of the sulci and all the sutures 

 are obliterated. It was found by G. F. Sternberg in T. 23 N., R. 

 10 W., San Juan County, N. Mex., in the Kirtland formation. 



Recently, however, Dr. Wiman (1933) has added much to a 

 better understanding of the skeletal anatomy of this species, through 

 the description of four specimens obtained for him in New Mexico 

 in 1921 by C. H. Sternberg. The description of the cervical and 

 caudal vertebrae and of the pelvic and pectoral arches together with 

 a humerus gives the first information of the skeleton aside from the 

 carapace and plastron. These species are said to have come from 

 both the Kirtland and Fruitland formations. 



Family BAENIDAE 



BAENA ORNATA, new species 



Figures 7, 8; Pl.\tb 14 



Tyye. — U.S.N.M, no. 13229, consisting of a nearly perfect carapace 

 and plastron. Collected by G. F. Sternberg, June 20, 1929. 



Locality. — 3 miles northeast of Hunter's Store (Bisti P. O.), 

 SWi/4, T. 24 N., R. 13 W., San Juan County, N. Mex. 



Horizon. — Kirtland formation. Upper Cretaceous. 



Description. — The specimen selected as the type of this species 

 is an unusually well preserved carapace and plastron, lacking only 

 some minor fragments. In outline the carapace is broadly ovate 

 with scalloped borders posterior to the inguinal notches. There is a 

 shallow median indenture in front and a wider and more pro- 

 nounced emargination of the central posterior border. 



At the widest part, about mid length, the carapace measures 437 

 mm across; its greatest length at the center is 478 mm. The depth 



