196 DR. EMBLETON AND ME, ATTHEY ON THE 



XIII. — On the Skull and other Bones of Loxomma Allmanni, 

 Huxley, from the Low Main, Newsham, Northumberland. By 

 Dennis Embleton, M.D., and Thomas Atthey. With four 

 Plates by William Dinning. 



In the " Annals," 1870, V., p. 374, appeared a paper by oui 

 late lamented friend Mr. Albany Hancock and Mr. Atthey, 

 " On the Occurrence of Loxomma Allmanni in the Northumber- 

 land Coal-field." In the same periodical, 1871, VII., p. 73, 

 and in the "Nat. Hist. Trans, of Northumberland and Dur- 

 ham," Vol. IV., pp. 201, 1871, and 390, 1872, they noticed 

 and partially described another skull of Loxomma which had 

 been met with in the same part of that coal-field by Mr. Atthey. 



This specimen, being the most complete that has yet been 

 found here or perhaps elsewhere, and wanting but little to make 

 it perfect, demands a detailed description. 



The skull has suffered strong compression almost directly 

 downward, with an inclination from right to left. 



The upper surface and right border are perfect ; but the bor- 

 der of the left maxilla is deficient. The two halves of a lower 

 jaw, right and left, and of the same size, were found near the 

 skull, to which, as they fitted it, they most probably belonged. 

 In addition to the skull and mandible, there were discovered, at 

 about the same time and place, vertebrae, ribs, and bones of the 

 extremities, presumably belonging to the same animal ; these 

 were not very numerous, but were by far the most common 

 bones of Labyrinthodonts of any size that were met with : and 

 they differed thus considerably from those of Anthracosaurus . 

 and of Pteroplax, the only other large Labyrinthodonts that 

 have as yet been found in the Northumberland Coal-field. 



The present paper contains -a description of the cranium, man- 

 dible, and teeth, and a notice of the vertebrae, ribs, and other 

 bones, in the following order, namely, the upper surface of the 

 cranium, the under surface, the occipital surface, the mandible 

 and teeth, and, lastly, the vertebrae, ribs, and bones of the 

 extremities. 



I. The tipper surface of the skull is represented in Plate I. 



