94 



FOSSIL TURTLES OF NORTH AMERICA. 



resemblances to the Baenidte, which flourisht at that time, it seems better to refer N eurankylus 

 to this family until more is known about it. 



Neurankylus eximius Lambe. 



Neurankylus eximius, Lambe, Contrib. Canad. Palaeont., in (4 to), 1902, p. 42, fig. 7. 



The remains on which this species was based were collected by Mr. Lawrence M. Lambe 

 in iqoi, from Judith River deposits, Belly River series, on Red Deer River, Alberta. They 

 consist of the costals of the third pair; the right fourth; the left fifth, sixth, seventh, eighth, 

 and the supernumerary ninth; the most posterior neural; and the suprapygal. No peripheral 

 bones were secured. The individual appears to have had a carapace 360 mm. long. The 

 eighth neural is elongated and wider behind than in front. It articulates laterally with the 



Fig. 90. Neurankylus eximius. Hinder portion of carapace of type. 

 From Lambe's figure. Xj. 



c. p. 3, c. p. 4, etc., costal plates; n. 3, . 4, etc., neural plates; spy, suprapygal. 



costals of the seventh, eighth, and ninth pairs. The posterior neural of Ba'ena riparia artic- 

 ulates with the seventh and eighth pairs of costals. The suprapygal of Neurankylus eximius 

 was probably followed by a pygal. 



The vertebral scutes are relatively broad, the third being nearly twice as wide as long. 

 The sides are bracket-shaped. The costo-marginal sulci evidently ran along on the peripheral 

 bones. The costal scutes had relatively little height. 



Mr. Lambe states that no very decided sculpture is shown on the surface of the bones. 

 Striations occur adjoining and at right angles with the sutures; elsewhere, especially near the 

 proximal ends of the costals, there is some roughness, produced by small, obscure, and irregular 

 depressions. On two of the costals there occur some comparatively large, concentrically 



curved groove-like markings. 



Genus THESCELUS nov. 



Carapace with an enamel-like surface, which is sculptured into raised dots and lines, the 

 latter irregular in length and direction, with intervening pits and valleys. The front of the 

 carapace shortened and excavated in the midline; the rear somewhat pointed. The plastron 

 like that of Ba'ena. Bridges broad, extending far forward. The buttresses feebly developt. 



Type: Thescelus insiliens Hay. 



The bridges of the members of this genus extend far forward, so that the opening for the 

 head and fore legs is narrowed. The movements of the fore legs must have been a good deal 



