1570 APPENDIX. 



ary posterior nares. Roofed temporal fossae also occur in the Amer- 

 ican genus Chilonyx (p. 1060); so that both of these forms ap- 

 proximate in this respect to the Pariasauria, although distinguished 

 from the typical representatives of that group by the absence of 

 sculpture on the cranial bones. Gorgonops may be regarded as the 

 type of the family Gorgonopidtz, with an uncertain serial position. 



The genus Embolophorus (p. 1060) is the only one in which the 

 articulation of the capitula of the ribs to the intercentra has yet 

 been observed. 



It appears that there is no justification for Eichwald's reference 

 of the tooth represented in fig. 983 (p. 1062) to Deuterosaurus 

 rather than to Brithopus ; the former genus having been founded 

 upon part of the vertebral column of a smaller reptile than the one 

 to which the humerus of Brithopus belonged. 



The vertebrae of the Diadectidce (p. 1061) are distinguished by 

 the presence of zygosphenal (hyposphenal) articulations ; while the 

 skull has no secondary posterior nares. Empedias differs from 

 Diadectes by the absence of a tusk ; while Helodectes is distinguished 

 from both by the double row of cheek-teeth. 



Sauropterygia. — It is stated on page 1077 that the genus 

 Cimoliosaurus has no trace of an interclavicle ; it has, however, been 

 subsequently suggested that certain splint-like bones found with 

 some skeletons of the Oxfordian representatives of this genus are 

 really the last remnants of the interclavicle and clavicles ; the inter- 

 clavicle probably fitting into the notch shown between the ventral 

 plates of the scapulae in fig. 988 (p. 1069). 



Chelonia. — In a recent paper Dr Baur states that in the skull 

 of Protostega (p. 1089) the parietals were connected by vertical 

 plates with the pterygoids, and he accordingly regards the Pro- 

 tostegidce as less specialised than the Dermochelyidce. If this refer- 

 ence be correct there will be evidence of a nearer affinity between 

 the Athecata and Testudinata than has hitherto been supposed. 



The same writer also doubts the Chelonian nature of the proble- 

 matical Psephoderma (p. 1089), and suggests that it maybe founded 

 upon the dermal armour of Nothosaurus. This argument is sup- 

 ported by the absence of Chelonian bones in the Lettenkohle (Lower 

 Keuper), where Psephoderma is not uncommon ; but the absence of 

 a dermal armour in the Lariosauridce, so far as it goes, is against 

 this view. 



In the Testudinidce the genus Palceochelys (p. 1108), as is well 

 shown by a specimen from the Pliocene of Italy recently described 

 as Emys Portisi, has some of the neural bones tetragonal and others 

 octagonal, and is thereby more nearly allied to Nicoria and the land 

 tortoises than to Ocadia. The so-called Emys crassa, of the Upper 

 Eocene of Hampshire, is, therefore, referable to Ocadia. 



