286 THE OSTEOLOGY OF THE REPTILES 



tiguous, without respiratory canal. Teeth compressed, curved, and 

 sharply pointed. Legs short and rather stout. 



This group, proposed as a separate order, is based almost exclu- 

 sively upon Erythrosuchus. In the structure of the skull it is some- 

 what intermediate between the Pseudosuchia and the Phytosauria. 



Triassic. Erythrosuchus Broom, South Africa. ? Scaponyx Wood- 

 ward, South America. 



c. Suborder Phytosauria 



Large, crawling, subaquatic reptiles, reaching a length of twenty 

 or more feet, especially characterized by the elongate face, com- 

 posed chiefly of the premaxillae, the posterior nares, and the deep 

 respiratory canal, formed by the underarching of the palatines. 

 Skull rugose, the lateral, temporal, and antorbital openings large, 

 the supratemporal opening small and more or less depressed below 

 the plane of the parietals. Tip of premaxillae decurved, with two 

 or three very long, cylindrical teeth on each. Teeth either cylin- 

 drical throughout, or the posterior ones more or less flattened and 

 separated. Neck, body, and tafl covered with four or more rows of 

 strong dermal bones; the pectoral region and abdomen with smaller, 

 bony scutes. Tail long and flattened, compressed. Feet probably 

 webbed. Vertebrae platycoelous ; two sacrals. 



Family Phytosauridae. IHum with postacetabular process; 

 pubis not dilated at extremity. 



Triassic. Phytosaurus Jaeger, Mystriosuchus Fraas, Mesorhinus 

 Jaekel, Germany. Parasuchus Lydekker, India. Paleorhinus Willis- 

 ton, Angistorhinus Mehl, Lophoprosopus Mehl, Rocky Mts. Rutiodon 

 Emmons (Rhytidodon) , Carolina, New York, Connecticut. 



Family Stagonolepidae. A supracoracoid foramen. Ilium with- 

 out postacetabular process; pubes dilated at extremity. 

 Triassic. Stagonolepis Huxley, England. 



[D. Suborder Desmatosuchia] 



[Large, long-tailed reptiles reaching a length of perhaps sixteen 

 feet, especially characterized by the probably secondary absence of 

 the upper temporal opening. Cervical and anterior dorsal bony 

 plates bearing long horn-like outgrowths. Skull with large antorbital 



