154 LABYRINTH0D0NT1A. 



Metoposaurus, and have a distinct pulp-cavity. Fully ossified vertebrae 

 are found with the other remains. The bone figured by the writer 

 in the ' Palaeontologia Indiea,' ser. iv. vol. i. pt. 5, pi. vi. fig. 3, as a 

 squamosal, appears to be a supratemporal ; and apparently makes a 

 close approximation to the corresponding bone of Metoposaurus. 

 Hab. India. 



R. 580. Five fragments of sculptured cranial bones ; from the 

 Maleri stage of the Upper Gondwanas at Maleri, 32 miles 

 north-west of Sironcha, Central Provinces. The sculpture 

 of some of these specimens closely resembles that of Meto- 

 posaurus diagnosticus. 

 Presented by the Director of the Geological Savvey of India, 1885. 



The following specimen may indicate an allied form. 

 Hab. Africa. 



R. 513. Fragment of a sculptured bone ; from the Karoo system of 

 the Orange Free State. The sculpture is unlike that of 

 Rhitidosteus. 



By exchange with the Blomfontein Museum, 1888. 



Genus TREMATOSAURUS, Braun 1 . 



Skull long, and gradually narrowing in front, with a rounded 

 muzzle ; palatal vacuities pointed in front, and far removed from 

 extremity of muzzle ; premaxillary vacuities small and widely sepa- 

 rated ; orbits oval, and situated far in advance of parietal foramen, 

 although not in anterior half of skull ; nares some distance behind 

 muzzle, large, approximated, and elongated ; lyra distinct, and en- 

 closing an ovoid space between the orbits and nares ; frontal long, 

 pointed at both extremities, and excluded from border of orbit by 

 junction of postfrontal with prefrontal ; postorbital and postfrontal 

 elongated. Premaxillary and maxillary teeth small and uniform ; 

 4 small vomerine teeth parallel to those of the maxilla ; two large 

 vomerine tusks in advance of posterior nares, and three or four 

 palatine ones behind the same. Cranial bones pitted at the centre, 

 and radiately grooved at the periphery. Posterior spine of median 

 plate of thoracic buckler larger and wider than in Mastodonsaurus, 

 but the general shape of the bone similar. 



1 Bericht Naturf. Aerzte, 1841, p. 74. 



