240 



DR. A. S. WOODWABD ON THE 



[Apr. 18, 



that the others as mounted (text-fig. 39, p. 233) are approximately 

 in their natural order, each articulating with two adjoining 

 vertebrae. Many, of coui-se, are missing. The most anterior 

 chevrons (text-fig. 46 A, p. 239) are normal, consisting of a pair of 

 simple elongated laminae, which are fused together in the long 

 extension beneath the haemal canal , and are united by a very slight 

 bridge of bone at their upper articular end. Further back, the 

 extension beneath the haemal canal begins to shorten and widen 

 into a triangular expansion, which ultimately becomes forked 

 below ; and the upper ends of the chevron are no longer united 

 even by a slender bony bridge. Still further back, the forked 

 laminae of the two sides begin to be only partially and irregularly 

 united in the middle line (text-fig. 46 B) ; while near the end of 

 the chevron-bearing middle part of the tail the laminae of the two 

 sides remain quite separate, and each is forked at so wide an angle 

 that it is practically a horizontal splint of bone which tapers to each 

 end and is suspended by a knob at its middle (text-fig. 46 C). 



Fore Limh. 



The scapula (text-fig. 39 A, p. 233) is a long and slender blade, 

 flattened on its inner face, gently convex on its outer face, and 

 apparently very little expanded at its distal end, which is incomplete 



Text-fig. 47. 



Text-fiff. 48. 



Text-fig. 47. — Cetiosaurtis leedsi. — Right liumerus, anterior aspect, and (A) trans- 

 verse section showing internal cavit}'. c, internal core of rock representing a 

 cavity ; d., deltoid crest ; h., thickened head. Ahout ^'3 nat. size. 



Text-fig. 48. — Cetiosaiirns leedsi. — Upper portion of riglit radius (r.) and ulna (?«.), 

 anterior aspect ; and (A) upper articular end of the same. About ^^ nat. size. 



