Dr. Francis Baron Nopcsa — British Dinosaurs. 291 



The number of the sacral vertebree seems in Streptospondylus to 

 liave been augmenting during lifetime from 3 to 4, perhaps even 

 to 5 or more.' In general the sacrum shows a great resemblance to 

 that of Megalosaurus, whereas in consequence of the development 

 of different laminee in the dorsal vertebras — a feature absent in 

 Megalosaurus — these parts as well as the cervical region are totally 

 different in these two reptiles. 



The biconcave and hourglass-shaped, transversely cylindrical 

 caudal vertebrae in Streptospondylus are likewise different from the 

 similarly biconcave and constricted but transversely wedge-shaped 

 caudals of Poikilopleuron} As in the caudals of most Dinosaurs, 

 the posterior facet for the chevron bone is much more marked than 

 the anterior, which in this case is nearly altogether wanting. 



The rod-like chevrons are both distally and proximally united ; they 

 are less compressed and comparatively shorter than in Iguanodon, 

 and they are supposed not to have extended so far backwards. 



Scapido-corncoids. Even in the immature Oxford specimen the 

 scapula and the coracoid are firmly united. The blade-like scapula is 

 somewhat concave on the inner side and in consequence somewhat 

 convex on the outer, and is much more slender than in Megalosaurus, 

 showing in its upper half that the borders are parallel. Inferiorly 

 it expands rapidly towards the margin of the coracoid. It forms, 

 with the semicircular coracoid, a very shallow glenoidal fossaj of 

 rectangular outline. There is no scapular crest or acromion-like 

 process ; these are altogether wanting. 



Humerus. As in all Theropoda, the humerus is very weak, but 

 perfectly distinct from the same much more massive bone in 

 Megalosaurus, or the more slender but still powerful humerus in 

 Poikilopleuron. The different development of the radial crest in each 

 case affords a good characteristic. 



Pelvis. The imperfect ilium shows in general, as pointed out by 

 Philips, some resemblance to Megalosaurus ; the proximally expanded, 

 distally rod-like ischium seems, however, to be somewhat different. 

 The pubis shows no obturator foramen. 



Posterior limb. The femur is somewhat longer than the tibia. 

 The head of the femur shows quite a distinct neck, the 

 trochanter major is weaker than in Allosaunis and situated lower 

 than the head, the well-developed fourth trochanter, situated at the 

 beginning of the upper third of the femur, shows the trochanter en 

 Crete pattern. The shaft of the femur is somewhat curved and 

 nearly cylindrical in section. 



Comparing the outline of the fourth trochanter of Streptospondylus 

 or Allosaurus with the figure given by Hulke for Zanclodon or the 

 outline visible in Euskelesaurus (in the Vienna femur), and then the 



' It is quite a common thing to find in the synsacrum of the Upper Cretaceous 

 Dinosaurs 8-10 vertebrae, lumbosacrals, sacrals, and caudosacrals firmly united. 

 Besides Claosaurus and Triceratops this is also the case in the sacra of two not yet 

 described Transylranian Dinosaurs. 



^ Careful original studies have convinced me that the type-specimens of Poikilo- 

 pleuron and the Stonesfield Megalosaurus (if. Bucklandi) are perfectly distinct. 



