518 Mr. D. M. S. Watson on the Cynodontia. 



R. 2572. The detaclied occiput figured by Seeley (Phil. 

 Trans. B, vol. 186, p. 130). Direct comparison and measure- 

 lueiits leave no doubt of the specific determination of this 

 important fragment. 



R. 3604. Tlie detached and absolutely perfectly preserved 

 maxilla figured by Seeley (Geol. Mag. 1908, p. 486). 



K. 4103. A dorso-ventrally crushed skull lacking the 

 premaxilla3 and part behind the orbits, but giving a good 

 palate. 



R. 4101. An uncrushed snout, with the bone of the 

 npper and outer surfaces weatheied away, but showing the 

 posterior part of the palate perfectly. 



Measurements on the teeth leave no doubt of the specific 

 identity of all these skulls. From them I have drawn fig. 9. 



The palate of Cynognatkus, although it is morphologically 

 identical with that of Gomphognatlms, Watson, 1911, presents 

 a somewhat different appearance owing to the sleiideniess of 

 the caudal part of the skull and tlie powerful snout. Seeley's 

 original accurate but difficult account of the basicranial region 

 was added to by the writer, Ann. & Mag. Nat. Hist. 1911, 

 ser. 8, vol. viii. pp. 293-330. 



The pterygoid has no quadrate ramus and is very short 

 anteriorly, the vomer forming the wliole of the roof of the 

 j^roove in the palate, and separating the pterygoids to the 

 beginning of the pterygo-parasphenoid bar. 



The palatine is in contact with the vomer throughout its 

 length. The ectopterygoid is a small bone lying at the root 

 of the huge pterygoid flange and completely surrounded by 

 other bones. 



The isolated maxilla R. 3604 shows anteiiorly the posterior 

 })art of the very deep pit for the reception of the lower canine, 

 the whole anterior margin of its secondary plate being a 

 sutural surface for the premaxilla. It is obvious that the 

 structure must have been different from that of Lycognallius 

 as described by Broom, Phil. Trans. B, vol. 206, p. 44. This 

 maxilla also shows that there was a minute septomaxillary 

 foramen opening forward at the posterior margin of the 

 nostril. 



Protacmon hrachyrhinus, gen. et sp. n. 



Type a beautifully preserved skull, with lower jaw in 

 apposition, from the Cynognathus-zone, Essex, Dist. Albert, 

 Cape Province, S. Africa, collected by the author. 



This specimen presents an interesting accident of preserva- 

 tion. Although perfectly preserved and with the teeth tightly 



