142 



On the Structure, Sfc,, of Fossil Reptilia. [Apr. 26, 



V. " Researches on the Structure, Organisation, and Classifica- 

 tion of the Fossil Reptilia. IV. On a Large Humerus from 

 the East Brak River, South Africa, indicating a New Order 

 of Fossil Animals which was more nearly intermediate 

 between Reptiles and Mammals than the Groups hitherto 

 known." By H. G. Seeley, F.R.S. Received April 5, 1888. 



(Abstract.) 



The late Mr. A. Gr. Bain sent to the British Museum a bone, 

 No. 36,250, which the author regards as a right humerus. It is 

 32 cm. long. The crests at its proximal end are compared with 

 those in the corresponding bone of Saurischia, Ornithosaurs, and 

 Anomodonts; and they show a strong general resemblance to the 

 crests seen in Monotremes, though their direction may be more 

 reptilian. The distal end of the bone is entirely mammalian in plan. 

 Its resemblances are about equally strong to Edentata and Monotre- 

 mata, and there are evidences of more distant relationship with 

 Itisectivora, w^th certain Marsupials, seals, and other Carnivora. On 

 the whole the evidence is insufficient to refer the fossil to the 

 Monotremata. It is named Propappus omocratus. The author pro- 

 poses to associate with it StereoracMs of Professor Gaudry, in an 

 order named Grennetotheria. While the humerus of StereoracMs only 

 differs from Monotremes in generic characters, and conforms in plan 

 to the monotreme rather than the edentate type, the shoulder-girdle is 

 intermediate between Echidna and the Anomodont Keirognathus, and 

 the dentition resembles that of reptiles like Lycosaurus and other 

 Theriodonts. 



VI. " Researches on the Structure, Organisation, and Classifica- 

 tion of the Fossil Reptilia. V. On Associated Bones of a 

 Small Anomodont Reptile {Keirognathus cordylus, Seeley), 

 showing the Relative Dimensions of the Anterior Parts of 

 the Skeleton, and Structure of the Fore-limb and Shoulder- 

 girdle." By H. G. Seeley, F.R.S. Received April 5, 1888. 



(Abstract.) 



This specimen was collected by Mr. Thomas Bain at Klip Fontein, 

 Fraser's Berg, and registered in the British Museum as 49,413. 



The head is described in detail, and except in the very small size 

 of the teeth, shows no difference of importance from the skulls attri- 

 buted to Dicynodon. 



