22 FOSSIL REPTILIA OF THE 



In the series of nine consecutive caudal vertebrae (Tab. IX, fig. 1), the number 

 and disposition of the dermo-neural and dermo-haemal bones were more fully and 

 satisfactorily exhibited. Three consecutive dermo-neurals extended over a series 

 of seven vertebrae, from near the fore part of the first to near the hinder half 

 of the last of these seven ; each extending over the interspaces of two vertebrae. 

 The corresponding dermo-hsemals are of smaller size, cross only one inter- 

 vertebral space, which is the second or posterior of those so crossed above, and 

 their hinder end is a little further back than that end of their homotype 

 above. But, in working out these vertebrae, indications of a third series of 

 caudal dermal bones were first met with. There extended over the articulation 

 between the twenty-first and twenty-second caudals the base of a dermal 

 bone, 3 inches long, crushed, with its apical ridge broken off. On its removal, 

 the vertebrae it crossed were seen to have been displaced to the extent of nearly 

 an inch. The position of this bone, and the ascertained relations of the neural 

 and haemal dermal bones to their vertebrae, made it improbable that it was one of 

 either of these series displaced ; and attention was quickened, which led to the 

 detection of a similar appearance further in advance, to be presently described. 



The best preserved dermo-neural, in the series of nine caudal vertebrae (Tab. 

 IX, fig. 1 d n), presents a basal longitudinal extent of 3 inches 5 lines, with a basal 

 breadth of 1 inch 9 lines : its quasi worm-eaten, rugose sides, converge to an upper 

 margin, not quite entire, but with apparently a contour resembling the dermo- 

 neural in fig. 5. The present larger bone overlies the twentieth and contiguous 

 portions of the nineteenth and twenty-first caudal vertebrae. The corresponding 

 dermo-haemal bone (d,h), with a longitudinal basal extent of 2 inches 6 lines, and a 

 basal breadth of 1 inch 3 lines, underlies the twentieth and twenty-first caudals, 

 extending along a greater proportion of the former. Its sides, similarly but more 

 finely sculptured than the dermo-neural above, converge to a convex inferior 

 border ; the depth of the side being not less than 1 inch 6 lines. The next 

 dermo-neural in advance overlies the eighteenth and contiguous half of the seven- 

 teenth caudal vertebrae. It presents a basal extent of 3 inches 6 lines, with a basal 

 breadth of 1 inch 6 lines. The base of the corresponding dermo-haemal spine is 

 preserved, which underlaps the hinder two thirds of the eighteenth and the front 

 third of the nineteenth caudal. Its base is 2 inches 7 lines in length, with a 

 moderate contour. The apical ridge and left side of this bone have been broken 

 away. 



Between the above-described dermo-neural and dermo-haemal bones there was 

 the base of a lateral dermal bone, 3 inches 5 lines in length, applied over the 

 eighteenth and part of the nineteenth caudal vertebrae, like that between the 

 twenty-first and twenty-second. The portion preserved in exposing these vertebras 

 is figured in the interspace produced by their slight dislocation, into which it 



