14G Mr. T. Atthej on Antliracosaurus Russelli. 



Plate YIl. 



Fiff. 5. Ceratosoma tenue. 5 a, Seen from below. 5 b. Seen from above. 



Fiff. 6. Ceratosoma hrevicaudatum. 



Fig. 7. Ceratosoma ohlonyum. 7 a. Seen from below. 7 h. Seen from 



above. 

 Fiff. 8, Trevehjana concinna. 8 a. Seen from above. 8 b. Seen from 



below. 



XVI. — On Anthracosaurus Russelli [Huxley). 

 Bj Thomas Atthey. 



[Plates VIII.-XL] 



In the ' Quart. Journ. Geol. Soc.,' 1863, vol. xix. p. 56, Prof. 

 Huxlej has described and fig^ured the palatal aspect of the 

 skwW oi Anthracosaurus Russelli from the Lanarkshire coal- 

 field, 12 miles east of Glasgow, 



In the 'Annals and Magazine of Natural History,' September 

 1869, there is a description of a large portion of another cra- 

 nium and the anterior extremity of a mandibular ramus, 

 together with a large sternal plate, of this powerful Labyrin- 

 thodont, from Newsham, 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 sec- 

 tions of the same, several ribs and vertebrae, one bone of an 

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

 Anthracosaui'us, obtained about two years ago from the black 

 shale overlying the Low-Main seam of coal at Newsham, near 

 Blytli, Northumberland, 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 prin- 

 cipal featm'es an amount of minute 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 



