326 ME. T. ATTHEY 01ST ANTHEACOSATTETJS ETTSSELLI. 



seven tenths of an inch, external to the head,' is large, standing 

 well out from the posterior or convex surface, and has a similar 

 concave articular surface to that of the head. A hroad 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 convex, tending to a ridge approaching the tubercle. The 

 sternal end of the rib is flattened above and below, 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 two inches and 

 a half to one inch and three-quarters in length, and are nearly 

 three-quarters of an inch in breadth at their anterior ends, which 

 are slightly rounded, and half an inch at their opposite ends, 

 which are obtusely pointed. Their upper surfaces are slightly 

 convex, and their under surfaces concave or spoon-shaped for the 

 anterior half of their length, the posterior half being convex ; 

 both their right and left margins are very thin (Plate VI. figs. 

 2 and 3). 



One bone 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 vertebrae, parallel with a part of the chain, and with 

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

 deviated to the left and at right angles to the others. The 

 upper end has been broken off obliquely, together with the 

 bones on which it rests. It is four inches in length as it lies ; 

 the lower end strongly resembles the lower end of a femur, and 

 has been compressed from side to side. The shaft has been lon- 

 gitudinally broken in upon its cavity, and is therefore irregular; 

 and the upper end or head is entirely wanting. 



Plate IX. fig. 1 is a transverse section of a maxillary tooth of 

 Anthracosaurus, from a specimen in my collection, other than 

 that figured in the former Plates. It is made at a line a little 

 below the apex and above the top of the pulp-cavity. It is 

 rather more elliptical than circular in outline, having two slight 



