PROCEEDINGS OF TKB GEOLOGICAL SOCIETY. 1 89 



The skull in Cetiosauria, known from the American type Diplo- 

 docus, is identified in the European genus Belodon, which is re- 

 garded as a primitive Cetiosaurian. 



Part 2 discusses the pelvis of Belodon, restored from specimens 

 in the British Museum, and regarded as Cetiosaurian. A restora- 

 tion of the shoulder-girdle is made, and found to resemble that in 

 Ichthyosaurs, Anomodonts, and Dinosauria. The vertebrae in form 

 and articulation of the ribs are Saurischian, the capitular and tuber- 

 cular facets being vertical in the dorsal region, and not horizontal 

 as in Crocodiles. The humerus shows some characters in common 

 with that of Stereoracliis dominans, in the epicondylar groove. In 

 general character the limb -bones are more Crocodilian than the axial 

 skeleton. The interclavicle is described, and regarded as a family 

 characteristic of the Belodontidse. 



In the 3rd part an account is given of Staganolepis, which is 

 regarded as showing a similar relation with the Megalosauria, to 

 that of Belodon with the Cetiosauria. This interpretation is based 

 chiefly upon the identification of the pubic bone in Staganolepis, 

 which has the proximal end notched as in Zanclodon and Strepto- 

 spondylus ; and the inner ridge at the proximal end is developed 

 into an internal plate. A note follows on the pelvis of Aetosaurus, 

 which is also referred to the Saurischia on evidence of its pelvic 

 characters, approximating to the Cetiosaurian sub-order. 



Part 4 treats of Zanclodon, which is regarded as closely allied to 

 Massospondylus, EusJcelesawus, and Streptospondylus. It is founded 

 chiefly on specimens in the Royal Museum at Stuttgart, and in the 

 University Museum at Tiibingen. The latter are regarded as 

 possibly referable to Teratosaurus, but are mentioned as Zanclodon 

 Quenstedti. The pelvis is described and restored. Zanclodon has 

 the cervical vertebrae relatively long, as compared with Megalosaurus, 

 and small as compared with the dorsal vertebrae, which have the 

 same Teleosauroid mode of union with the neural arch as is seen 

 in Streptospondylus and Massospondylus, The sternum, of Pleinin- 

 ger, is the right and left pubic bones ; but there is much the same 

 difi^erence in the proximal articular ends of those bones in the fossils 

 at Stuttgart and Tiibingen, as distinguishes corresponding parts of 

 the pubes in Megalosaurus and Streptospondylus. The ilium is more 

 like that of Palceosaurus and Dimodosaurus. The limb-bones and 

 digits are most like those of Dimodosaurus, but the teeth resemble 

 Palceosaurus, EusJcelesaurus, Megalosaurus, and Streptospondylus. 



Part 5 discusses Thecodontosaurus and Palmosaurus upon evidence 

 from the Dolomitic Conglomerate in the Bristol Museum. An attempt 

 is made to separate the remains into those referable to Thecodonto- 

 saurus and those belonging to Palceosaurus. The latter is represented 

 by dorsal and caudal vertebrae, scapular arch, humerus, ulna, 

 metacarpals, ilium, femur, tibia, fibula, metatarsals, and phalanges. 

 These portions of the skeleton are described. There is throughout 

 a strong resemblance to Zanclodon and other Triassic types. A new 

 type of ilium and the humerus originally figured are referred to 

 Thecodontosaurus. 



VOL. XLVIII. 



