THEROMORPHA 



183 



skull, wMcli is less than 10 cm. long, and has the nares divided by a median 

 septum. Four incisors above and three below, with one canine and a number 

 of tricuspidate molars in each jaw. Karoo Formation ; South Africa. 



Lycosaurus, Owen (Fig. 287). Like the preceding, except that the molari- 

 form teeth are all simple cones, though more or less compressed and with finely 

 serrated edges. There are about 

 five of them on each side above 

 and below. Karoo Formation ■ 

 South Africa. 



Aelurosaurus, Owen. Difters 

 from Lycosaurus in having small, 

 pointed teeth irregularly grouped 

 on anterior half of the palate. 

 Same horizon. 



Oi/nognathus, Seeley. Skull 

 remarkably mammalian - like, 

 about 40 cm. long, with divided 

 nares and two prominent convex 

 condyles below the foramen 

 magnum, composed chiefly of 

 the exoccipitals. There are 

 four serrated incisoirs in the 

 upper and three in the lower jaw ; and one canine and nine molars above 

 and below on each side. Six cervicals, eighteen dorsals, five lunibars, and 

 three or four sacrals. Accompanies the preceding. 0. crateronoius, Seeley. 



Cynochampsa, Ci/nodraco, Cynosuckus, Gorgonops, Tigrisuchus, Owen. Founded 

 on more or less imperfect remains from the Karoo Formation of South Africa. 



Fig. 2S7. 



Lycosaurus curvimola, Owen. Karoo Formation ; Kugaberg, 

 Cape Colony. Skull, lateral aspect, 1/3. a, Orbit ; &, Mandible 

 (after Owen). 



Family 2. Deuterosauridae. Seeley. 



Canines large, with serrated anterior and posterior margins; no palatal teeth. 

 Sacrum of two anchylosed vertebrae. Pahs double-headed. Scapula flat ; ilium not 

 produced anteriorly ; acetabulum closed. Permian ; Russia. 



Deuterosaurus, Eichw. Skull with a median crest ; incisors large and 

 transversely compressed. Lachrymals greatly developed ; quadrate large ; 

 scapula distally expanded. 



Rhopalodon, Fischer. Like the preceding, but with serrated incisors, and 

 lanceolate molars behind the canines. Supratemporal vacuity very small ; 

 sclerotic ring present. 



The fragmentary remains described as Brithopus, Orthopus, and Syodon by 

 Kutorga, and Dinosaurus by Fischer, are probably identifiable with the above 

 genera, which they accompany. Cliorhizodon, Twelvetrees, is of uncertain 

 position. 



Family 3. Tritylodontidae. Cope. 



Snout broad and obtuse. A pair of large incisors or canine-like teeth in front, 

 apparently growing from a persistent pulp. Molariform teeth bearing tioo or three 

 longitudinal series of tubercles. Posterior nares remote, and roofed over by secondary 

 palate. Quadrate reduced. Trias. 



