No.1747. DESCRIPTIONS OF \i:\V FOSSIL TURTLES HAY 



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COMPSEMYS VAFER, new species. 



The type of Compsemys vafer consists of about nine peripherals, 

 three neurals, a few fragments of costal plates, and some fragments 

 of the plastron. This material was collected by Messrs. Gardner and 

 Gidley near Ojo Alamo, New Mexico, in deposits about 50 feel above 

 the upper conglomerate, and therefore above the dinosaur-bearing 

 beds. The catalogue number in the U. S. National Museum is 6551. 

 At the same level the collectors obtained the right mesoplastron and 

 right hypoplastron of one individual and the left hypoplastron of 

 another, which are regarded as belonging to the same species as thai 

 numbered 6551. The three bones last mentioned are included under 

 the catalogue number 6553. 



Most of the bones of the first-named individual are covered with a 

 laver of clav which is so hard that it is very difficult to remove it. 



Figs. 2-.").— Compsemys vafer. XI- '-• first, second, and third neurals; :■;, first and third right 



PERIPHERALS, WITH RESTORATION OF THE SECOND; 4, SF.CTION OF FRONT END OF EIGHTH PERIPHERAL; 

 5, SECTION ACROSS TENTH PERIPHERAL. 



Nevertheless a few of the bones are in satisfactory condition. It is 

 estimated that the carapace had originally a length of about 1 foot. 

 The three neurals (fig. 2) are the first, second, and third of the series. 

 The form of each is seen from the figure. The first is 25 nun. long 

 and 19 mm. wide; the second is 21 mm. long, 23 mm. wide, and 7 

 mm. thick; the third is 22 mm. long, 24 mm. wide, and 8 nun. thick. 

 One fragment of a costal is 26 mm. wide, 4 mm. thick at one edge, 

 and 5 mm. at the other. Another fragment (Plate 10, fig. 1 ) is figured 

 to show the sculpture. Proximal ends of the three costals vary from 

 5 to 6 mm. in thickness. Fig. 5 of Plate 10 represents the upper sur- 

 face of the right first peripheral, it is r K .~) mm. thick where it joined 

 the nuchal, 8 mm. where it joined the second peripheral. The free 

 border is obtuse. On the lower side the sculptured surface extends 

 backward from the edge S mm. at the end next the nuchal; 11 nun. 

 at the other end. On the upper surface are portions of the firsl and 



