808 MR. T. ATTHEY OX AXTHKACOSArHTTS EUSSELLI. 



portions of the jugal, suprateinporal, quaclrate-jugal, squamous, 

 and parietal bones of the right side of the cranium ; thirdly, in 

 the left side of the cranium has been imbedded a small vertebra, 

 probably of the neck (this vertebra seems to have been thrust 

 forcibly in between the bones of the upper wall and those of the 

 floor of the cranium) ; fourthly, the posterior part of the left 

 palate-bone overlies, on the same side, parts of the jugal, quad- 

 rate-jugal, and supratemporal bones. The rest of the upper 

 surface of the skull is uncovered, and can be well seen. 



The skull of Anthracosaurus is much broader in proportion to 

 its length, and altogether stronger, than that of Loxomma ; and 

 both of these are much larger and stronger than that of Ptero- 

 plax, these three being the only large Labyrinthodonts as yet 

 found in our Coal-field. 



The upper surface of the skull of Anthracosaurus is represented 

 in Plate VI. It is broadly triangular, with rounded anterior and 

 posterior angles, deeply concave between the posterior angles, 

 and slightly convex on the sides. It is not quite perfect. Its 

 right side or border, however, is so ; whilst from its left side the 

 maxillary bone has been displaced, and was found imbedded in 

 the same slab of shale at a short distance from its proper position 

 in the skull. Further, a portion, about an inch in breadth and 

 three inches in length of the inner posterior border of the right 

 maxillary extension, and an inch of the posterior angle of the 

 same extension of the left side, are deficient. Moreover, the 

 right and left angles of the occiput are also slightly deficient. 



The length of the skull along the median line, from the tip of 

 the snout to the posterior edge of the occiput, is thirteen inches 

 and a half, and from the same point to the ends of the maxillary 

 prolongations seventeen inches. The greatest breadth, fourteen 

 inches, is at one inch and a half in front of the ends of these 

 prolongations. Over the posterior ends of the orbital vacuities 

 the breadth is twelve inches, over the anterior ends of the same 

 ten inches and a quarter, and at three inches behind the snout 

 five inches and three-quarters, inclusive of the breadth of the 

 left maxillary bone, which at this part is absent, but has been 

 estimated at the same breadth as that of the right maxilla, 



