MEGALOSAURID^l. 159 



manus of AUosaurus (Marsh, 'Amer. Journ.' ser. 3, 

 vol. xxvii. pi. xii.), that there seems little doubt as to its 

 belonging to the present form. Fox Collection. 



R. 899. Part of an apparently similar phalangeal; from the 

 Wealden of the Isle of Wight. Same history. 



Genus MEGALOSAURUS, Buckland 1 . 

 Syn. Pcekilopleuron, Deslongchamps 2 . 



Serrations not embracing the whole of anterior border of teeth. 

 Cervical vertebrae opisthocoelous : dorsals with centra much con- 

 stricted inferiorly and laterally, and subcircular terminal faces ; 

 their arches tall, with three lateral pits separated by ridges between 

 the zygapophyses, and spines very lofty ; five vertebrae in sacrum, 

 of which adjacent ones support the arches. Probably four digits in 

 manus ; astragalus with process ascending anterior surface of tibia ; 

 three digits in pes. 



The North-American genera AUosaurus 3 and Dryptosaurus 4 

 appear to be very closely allied ; the pelvis 5 of the former is repre- 

 sented in fig. 25. 



Megalosaurus bucklandi, Meyer 6 . 

 Syn. Pozkilopleuron bucklandi, Deslongchamps 7 (in parte). 



The type species. Apparently somewhat larger than AUosaurus 

 fragilis, Marsh, of which the estimated length is about 25 feet ; the 

 length of the femur of the former, figured by Marsh, is 0,850 (30 

 inches), and that of Megalosaurus, figured by Phillips, 0,978 (35 

 inches). The upper half of the anterior border of the teeth is ser- 

 rated. 



Eor the identity of Pozkilopleuron bucklandi with this species see 

 Hulke, ' Quart. Journ. Geol. Soc' vol. xxxv. p. 233 (1879). 



Hah. Europe (England and France). 



1 Trans. Geol. Soc. ser. 2, vol. i. p. 390 (1824). 



2 Mem. Soc. Linn. Normandie, vol. vi. p. 37 (1834). 



3 See Marsh, Amer. Journ. ser. 3, vol. xxvii. pis. xi., xii. (1884). 



4 Infra, p. 169. 



5 In Phillips's ' Geology of Oxford,' p. 210, fig. G4, the ilium of Megalosaurus 

 is turned the wrong way forward. 



6 Paheologica, p. 110 (1832). 



Mem. Soc. Linn. Normandie, vol. vi. p. 37 (1838). 



