158 LABYRINTHODOlSrTIA. 



palatines bear teeth and are situated immediately on the inner side 

 of the maxillae, as in the Mastodonsauriclce. In the typical forms 

 there is no postarticular process to the mandible. 



Genus ANTHRACOSAURUS, Huxley 1 . 



The type genus. Skull broadly triangular, with large postero- 

 lateral expansions and small epiotic cornua ; orbits very small, 

 subtriangular, approximated, and situated in the hinder third of 

 the skull ; nares small, round, and widely separated ; lyra indis- 

 tinct ; frontal excluded from orbit by junction of prefrontal with 

 postfrontal ; anterior border of orbit formed by prefrontal ; vomer 

 small and toothless. Premaxillary and maxillary teeth few, un- 

 equal, and forming an irregular series ; one large palatine tusk near 

 the posterior nares, and others further back ; mandibular teeth 

 irregular ; pterygoids apparently carrying a number of denticules. 

 Crowns of teeth ridged, conical, with a transversely oval section at 

 the base, and laterally compressed and curved near the summit 2 , 

 where the marginal ones are carinated ; plications of dentine very 

 complex. Mandibular ramus short and highly arcuated inferiorly 3 . 

 Cranial sculpture pitted and very sparsely distributed. Intercentra 

 apparently absent in vertebral column. Anihracosaurus raniceps, 

 Coldenberg, does not belong to this genus. 



Anthracosaurus russelli, Huxley 4 . 



The type and only described species. Of large size, the cranium 

 having a length of about 0,360 (14-2 inches), and a width of 0,330 

 (11*8 inches). Muzzle very broad and rounded. Figures of the 

 skull &c. are given by Atthey in the 'Ann. Mag. Nat. Hist.' ser. 4, 

 vol. xviii. pis. viii.-xi. (1876). The type specimen is from the Coal- 

 Measures (Upper Carboniferous) of Lanarkshire 5 . 



Hah. Europe (Britain). 



30532. Slab of rock showing a large portion of the palate in a very 

 imperfect condition ; probably from the Lower Carboni- 

 ferous of Burdie House, near Edinburgh. This specimen 

 extends as far back as the posterior extremity of the 



1 Quart. Journ. Geol. Soc. vol. xix. p. 56 (1863). 



2 Atthey, Ann. Mag. Nat. Hist. ser. 4, vol. xviii. p. 160 (1876). 



3 See Ann. Mag. Nat. Hist ser. 4, vol. xviii. pi. x. ; it was stated in the Eep. 

 Brit. Assoc, for 1874, p. 159, that the mandible had a postarticular process, but 

 its absence is clearly shown in this figure. 



1 hoc. cit. 



6 See Quart. Journ. Geol. Soc. Inc. cit. 



