ME. T. ATTHEY ON ANTHEAC0SAT7EUS EUSSELLI. 307 



XX. — On Anthracosaurus Russelli, Huxley. By Thos. Atthey. 

 With foue Plates by "William Dinging. 



In the " Quart. Journ. Geol. Soc," 1863, Yol. XIX., p. 56, 

 Prof. Huxley has described and figured the palatal aspect of the 

 skull of Anthracosaurus Russelli from the Lanarkshire Coal-field, 

 twelve miles east of Glasgow. 



In the " Annals and Magazine of Natural History," Septem- 

 ber, 1869, there is a description of a large portion of another 

 cranium and the anterior extremity of a mandibular ramus, to- 

 gether with a large sternal plate, of this powerful Labyrintho- 

 dont, from Newsharn, Northumberland.* 



Also, in the February number (1871) of the "Annals," there 

 appear a description and figure of a considerable portion of a 

 mandibular ramus of the same animal, from the new ironstone 

 shale of Fenton, Staffordshire, by my late lamented friend Mr. 

 Albany Hancock and myself.* 



In the present communication I propose to describe and figure 

 the upper and under surfaces of the cranium, the right and left 

 rami of the mandible, the teeth with microscopic sections of the 

 same, several ribs and vertebra?, one bone of an extremity, and 

 some scutes, all belonging to one and the same Anthracosaurus, 

 obtained about two years ago from the black shale overlying the 

 Low-Main seam of coal at Newsham, near Blyth, Northumber- 

 land, by one of the workmen, of whom it was purchased through 

 Mr. T. P. Barkas, of this town. It was in a very rough state 

 and much broken when it came into my hands, and has required 

 for the redevelopment of its principal features an amount of mi- 

 nute work, care, and time that can be appreciated only by those 

 who have been engaged in similar undertakings. 



Further, there are certain things here to be mentioned as still 

 obscuring or hiding more or less the upper surface of the skull. 

 First, there is a crack or fissure across the anterior end, a short 

 way behind the snout, through the nasal bones, and lying over 

 the position of the great palatine teeth ; secondly, the anterior 

 end of the left ramus of the mandible lies transversely across 



* Trans. Tyneside Nat. Field Club, Vol. III., p. 313 ; and Vol. IV., p. 385. 



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