ME. T. ATTHEY OX ANTHRACOSAFKTJS RTTSSELLI. 309 



The pitted sculpturing on the surface of the bones is more irre- 

 gular and more closely crowded about the snout than it is on the 

 skull of Loxomma ; and it is rougher and deeper on the anterior 

 than on the posterior region of the cranium. The surface alto- 

 gether has a rougher appearance than in Loxomma. ]No glandu- 

 lar openings have been discovered at the bottoms of the pits or 

 hollows, such as are found in the corresponding parts of Loxomma, 

 this discrepancy pointing very probably to some as yet unrecog- 

 nized difference in the state of the integument in these animals. 



The nostrils are openings of about half an inch diameter, and 

 slightly oval in outline. They are bounded in front by the pre- 

 maxillaries, internally by the nasals, externally and posteriorly 

 by the maxillaries. They are two inches and a half apart ; and 

 a line drawn across the nasal region between the middles of their 

 internal margins is one inch behind the mid point of the snout. 

 They are only half an inch distant from the margin of the jaw, 

 and are placed much further forward than the nostrils of Loxomma. 



The mucus-grooves are two pairs. The anterior pair run back- 

 wards and inwards along the inner side of the naso-lacrymal 

 suture as far as the posterior margins of the nasals ; the posterior 

 are deeper, and appear in two disconnected portions along the 

 outer margins of the jugal and quadrate -jugal bones. The an- 

 terior pair of grooves are less deep and less distinct than those 

 of Loxomma ; the posterior are deeper, wider, and rougher than 

 those of that Labyrinthodont. In Anthracosaurus there is only 

 one pair of mucus-grooves in front, instead of two pairs as in 

 Loxomma; whilst in the former only these posterior grooves 

 exist. In Anthracosaurus the anterior grooves lie, as far as 

 can be seen, entirely on the nasals ; in Loxomma the anterior 

 grooves lie nearly altogether on the premaxillaries, and the 

 posterior on the maxillary and lacrymal bones. 



The orbital vacuities, broader in front than behind (in fact, 

 somewhat heart-shaped), arc placed eight inches and three-quar- 

 ters behind the snout, are two inches long, and one inch and 

 three-quarters broad; at their anterior margins are two conca- 

 vities, the inner rather smaller than the outer, having a sharp 



