Mr. T. Atthey on Anthracosaurus Russelli. 161 



The measurements of the small dorsal vertebra (PI. X. 

 %. 4) are as follows (in inches) : — 



inch. 



Height of body 1-6 



Transverse diameter of body 1'6 



Length of body 0-6 



Height of neural arch 0*3 



Height of spinous process from top of neural arch to 



apex 2-3 



Length of ditto 0-6 



Thickness of ditto 0-3 



Width of transverse process 0*6 



Thickness of ditto 0-2 



Length of ditto 1-2 



The spinous process projects directly upwards and is very 

 thick and strong and somewhat enlarged near the extremity, 

 which is pointed. 



Ribs. — Upwards of twenty ribs were found associated with 

 the skull and vertebree ; a good many of these are j^erfect. The 

 largest is 9 inches long, by a little more than half an inch in 

 breadth, and is well and regularly arched. The curve of the 

 bone is continued as far as the head, which ends in a concave, 

 transversely oval, undivided, articular surface ; the tubercle is 

 -j2jj- inch external to the head, is large, standing well out from 

 the posterior or convex surface, and has a similar concave ar- 

 ticular surface to that of the head. A broad groove runs along 

 the inner and under surface of the rib from between the head 

 and the tubercle for about two thirds of the length of the rib 

 towards the sternal end. The upper border of the rib is con- 

 vex, tending to a ridge approaching the tubercle. The 

 sternal end of the rib is flattened above and beloAV, and presents 

 an oval concavity to receive the corresponding costal cartilage. 



Scutes. — About thirty scutes have been found scattered about 

 in the matrix in close proximity to the skull ; the largest 

 group consists of six, which are in contact with each other, but 

 not in their normal relative position. They vary from 2| inches 

 to If inch in length, and are nearly | inch in breadth at their 

 anterior ends, which are slightly rounded, and ^ inch at their 

 opposite ends, which are obtusely pointed. Their upper sur- 

 faces are slightly convex, and their under surfaces concave or 

 spoon-shaped for the anterior half of their length, the pos- 

 terior half being convex ; both their right and left margins are 

 very thin (Plate VIII. figs. 2 & 3). 



One hone of a limb. — This is large, and most probably a 

 femur. It lies on the left side and at the posterior end of the 

 large series of vertebra?, parallel with a part of the chain, and 

 with its upper end resting upon two or three vertebrae, which 



