4 Professor H. G. Seeley — Dinosaurs from Rhcetic Beds. 



The bone is manifestly that of a new Zanclodont Saurian, and the 

 pelvis and other parts of the skeleton may be expected to conform 

 to the types at Stuttgart and Tubingen. The shaft of the femur is 

 much straighter than in Megalosaurus, and the other characters all 

 tend to remove the genus Avalonia from the types in w^hich the 

 pubic bones are slender and rod-like, and refer it to types in which 

 those bones are flattened plates. 



Only 16 inches of the proximal end of the left tibia is preserved. 

 The proximal end is greatly expanded, especially towards the anterior 

 crest of the bone. The proximal surface is truncated in the usual 

 way, and is triangular. It measures 12 inches from front to 

 back, and 9 inches from side to side behind, indicating, as the 

 femur is nearly a foot wide, that the fibula had the usual slender 

 form. The inner side of the bone is smooth and convex from 

 front to back ; the fibular side has a shallow channel for the fibula. 

 The posterior side is concave in the middle width at the proximal 

 end. These characters are too few to greatly elucidate the characters 

 of the animal, but they are in harmony with the proximal end of the 

 tibia in the genera which have resemblances to the femoral bone. 



The hind foot is evidenced by digital and terminal claw phalanges. 

 In all characters these bones are so remarkably like those which 

 I have figured in EusTcelesaurus (Annals Nat. Hist., ser. vi, vol. xiv, 

 p. 332, 1894) that I can point to no difi"erences between them. 

 The transverse width of the claw phalange removes the animal from 

 all allies of Megalosaurus, It is not quite so wide as the same bone 

 in Cetiosaurus, and conforms to the type of Zanclodon preserved at 

 Tubingen. The digital phalanges are 2-^^ inches long, as wide 

 behind, narrower in front ; I-i-q- inch deep behind, depressed in 

 front. The bone narrows superiorly, and has the trochlear ex- 

 tremities completely ossified. The claw phalange exceeds 4 inches 

 in length, being more than one-tenth of the length of the femur, and 

 nearly twice the length of a penultimate phalange. Its articular 

 end is trapezoidal, fully 2 inches deep, and as wide below the middle. 

 The usual vascular grooves extend in arched curves along the sides 

 of the bone, and are continued transversely beneath the articular end. 

 The limb bones probably indicate an animal less than six feet high. 



The vertebrae preserved appear to indicate two animals. The 

 dorsal vertebrae all agree in the anterior face being flattened 

 and relatively small, while the posterior face is concave and much 

 larger. In this they resemble the vertebrse of Avalonia. But 

 since one type has the centrum 5 to 5^ inches long, with the 

 anterior face 6 inches deep, while the posterior face is 8 inches 

 deep, I conclude that it indicates a distinct animal from the 

 second type, in which the centrum is 5^ to 6 inches long, with 

 the articular faces vertically ovate instead of circular, 4:| inches deep 

 in front, and 5 inches deep behind. After making all allowances for 

 the efi'ects of compression and distortion, I am compelled to refer 

 the larger vertebra to the animal with the larger tooth, and suppose 

 that the animal with the smaller tooth was represented by the 

 smaller dorsal vertebra. The large size of the centrum exceeds 



