Fossil Reptiles. 337 



to a species of Belodon. The other bones however are not very 

 like those of BrJodoti. The pubis and ischium are really modi- 

 fications of the plate-like type, and form a continuous symphysis 

 with those of the oi)posite side. The puljis is curiously twisted. 

 The upper part of the sym[)hysis is in line with that of the ischium , 

 but a little above the m.iddle of the bone the symphysis turns 

 abruptly down, making almost a right angle with the upper i)art, 

 and causing the greater part of the pubis to be directed downward. 

 There is a well developed pubic foramen which extends almost 

 with the suture between the ischium and the pubis. The ischium 

 is a flattened bone which differs from that of Behdon iu having the 

 posterior part almost as broad as the anterior. 



The shoulder girdle has a very large scapula with a broad 

 upper end, and a very small rounded coracoid with a large coracoid 

 foramen. 



The humerus is unlike that of Belodon in being much broader 

 at both the upper and lower ends, and in having the del to-pectoral 

 ridge much better developed. 



The vertebrae best preserved are probably lower dorsal. They 

 have the centra constricted, and are only feebly biconcave. The 

 transverse process is of moderate size and gives an imperfectly 

 dii'ected articulation to the head of the rib. The rib is really single- 

 headed, as, though there are two large articular surfaces, there 

 is a slight connection between the two. 



One small dermal ossification has been found, but it shows no 

 evidence of pitting or other ornamentation. 



The following are some of the principal measurements : — 



Width of lower end of ilium ... ... 205 mm. 



Length of ischium ... ... ... 310 mm. 



Greatest breadth of ischium ... ... 230 mm* 



Length of humerus ... ... ... 307 mm. 



Width of top of humerus ... ... 230 mm. 



Width of bottom of humerus... ... 190 mm. 



Length of scapula ... ... ... 485 mm. 



Width of top of scapula ... ... 205 mm. 



There seems little doubt that Erijtitrosiiclms is one of the 

 Phytosaiiria. The beds in which it occurs are believed to be 

 Upper Triassic. 



