No. 1747. DESCRIPTIONS OF \'EW FOSSIL TURTLES HAY. 321 



of the entoplastron. In A. substricta the sulcus is only tangenl to the 

 bono. The line of contact between the right and the left numerals 

 is thus shorter than in J. substricta in the rat io of 28 to 40, as is shown 

 in the second and third columns of the table. The pectorals of the 

 two species have the same relative length, as also the abdominals 

 have. The hinder lobe of A. annexa is more narrowed posteriorly 

 than that of A. substricta. On each bridge there are four inf ramarsinal 

 scutes, which resemble clos !y those of the type of the genus. 



Genus HOPLOCHELYS H 



Supported by the materials described below under the name 

 Hoplochelys bicarinata the writer ventures to add to the definition of 

 the genus thai was given in his work The Fossil Turtles of North 

 America, page 263. 



Shell thick and solid. Peripherals united to the plastral bones by 

 means of digitations and dentated sutures; with the costals by 

 gomphosis and in some cases by simple apposition, in others by close 

 sutures. Carapace furnished with three dorsal carina 1 , the median 

 sometimes feebly developed. Plastron with the anterior and pos- 

 terior lobes immovable and with the posterior narrow. A row of 

 inframarginal scutes on each bridge. Pectoral and femoral scutes 

 meeting and crowding the abdominals from mutual contact at the 

 midline. Intergulars and gulars wanting, or consolidated with the 

 humerals. 



HOPLOCHELYS BICARINATA, new species. 



The type of the present species has the catalogue number 6549 of 

 the U. S. National Museum. It was collected September 2, 1909, at 

 Ojo Alamo, San Juan County, New Mexico, by Messrs. Gardner and 

 Gidley. It is stated to have been found 50 feet above the upper bed 

 of conglomerate, and it therefore belongs probably to either the 

 Puerco or the Torrejon. The type of the genus is Hoplochelys crassa 

 (Cope). This was secured by Cope's collector at Chaco Canyon, San 

 Juan County, New Mexico, but there is uncertainty whether in the 

 Puerco or the Torrejon. Two other species of the genus. //. saliens 

 and H. paludosa, are from the Torrejon; a third, //. cselata Hay, is 

 from the Fort Union of Montana, but the beds appear to be equiva- 

 lent to the Torrejon. 



Of the specimen here described there are present parts of two 

 neurals, one complete costal, the left fourth, and parts of several 

 others, eleven peripherals, and the greater pari of the plastron. The 

 bones are thick and the shell was heavy and solidly constructed. 

 The outer surface of all t he hones is undulating, but smoot h, and t here 

 is no ornamentation of any kind. The carapace (Plate 12, fig. I 

 had originally a length of about L75 nun. and a width of aboul 1 10 



Proc.N.M.vuUis-lO L'l 



