EEPTILIA OF KIRTLAND FORMATION GILMOEE 177 



in having the nuchal less deeply excavated ; and from T. rapiens of 

 the Ojo Alamo by the lack of a median depression along the back, 

 relatively wider vertebrals, and rough sculpture of the carapace. 



In a recent paper Wiman (1933) has described a specimen from 

 the Kirtland formation of New Mexico, which he refers to Thescehis 

 hmlefis Hay, a Lance species. Compared with the type of T. insilens, 

 the broadly rounded posterior border of the carapace at once dis- 

 tinguishes it from the narrowed, protrudent border of the Lance 

 specimen, and this feature in conjunction with their different geo- 

 logical occurrence apparently indicates the incorrectness of its 

 assignment. 



In so far as comparisons can be made from descriptions and 

 illustration, I find the Upsala specimen to be in close accord with 

 T. he'tnispherica here described, to which the specimen is now re- 

 ferred. In figure 11 the missing posterior borders of the type have 

 been restored after the Upsala specimen, which fortunately is well 

 preserved, and serve to give us a complete picture of the carapace. 

 The one discordant feature of this assignment appears to be that of 

 the surface sculpture, of which Wiman says : " Die Oberflache zeigt 

 heir und da eine feine wenig charakteristische Skulptur, die an 

 gerunzeltes Chagrinleder erinnert." There is no trace of this style 

 of sculpture on the shell of the type of T. hemisph erica, but it has 

 the sculpture of T. insilens as described by Hay (1908, p. 95). 



Parks (1933a) recently described a new turtle under the name 

 Baena fluviatiJis from the Belly River formation of Canada, which 

 at my suggestion is now referred (Parks, 1933b) to the genus 

 Thescelus. 



The presence of paired supracaudal scutes posterior to the fifth 

 vertebral, rear border of carapace unscalloped, and anterior lobe 

 of plastron longer than posterior are all features foreign to the 

 genus Baena and in accord with Thescelus. Unfortunately much of 

 the anterior border of the type specimen is missing, so that a full 

 diagnosis cannot be made, but in view of the features pointed out 

 the assignment to Thescelus is probably correct. 



This specimen is of much interest in recording the first occurrence 

 of Thescelus in the Belly River formation and also in greatly ex- 

 tending its known geographic range. T. hemispherica from the 

 Kirtland may be distinguished from T. ilwviatilu by its smaller size 

 and relatively narrower vertebrals, especially the fourth and fifth, 

 and narrower anterior lobe. 



