ANTHRACOSAUKIDJE. 165 



given in the ' Eep. Brit. Assoc' for 1873, pis. i., ii., is 

 chiefly taken from it. Presented by George Maw, Esq. 



R. 306. Slab of shale showing the external surface of the left 

 (Fig.) dentarj element of the mandible ; from the Coal-Measures 

 (Upper Carboniferous) near Hamilton, Lanarkshire. Five 

 large tusk-like teeth are shown, one of which is figured in 

 the accompanying woodcut. This specimen accords with 

 the imperfect mandible figured by Barkas in his ' Coal- 

 Measure Palaeontology/ pi. ix. fig. 195, and referred to 

 Pteroplax. Egerton Collection. Purchased, 1882. 



R. 57. Fragment of ironstone showing the imperfect crown of one 

 of the large mandibular tusks ; from the Coal-Measures of 

 Shelton, North Staffordshire. Purchased, 1881. 



Piar. 38. 



Loxomma allmani. — Outer aspect of a lower tooth ; from the Coal- 

 Measures of Lanarkshire. \. 



R. 1738. Fragment of shale showing the lateral aspect of the 

 crown of a tusk ; from the Coal-Measures of (?) Northum- 

 berland. Egerton Collection. Purchased, 1882. 



R. 1739. Fragment of shale showing one side of a somewhat 



smaller tusk ; from the Coal-Measures of Northumberland. 



Presented by T. P. BarJcas, Esq., 1871. 



41126. Fragment of shale showing a median thoracic plate (inter- 

 clavicle) not improbably belonging to this form ; from the 

 Lower Carboniferous of Burdie House, near Edinburgh. 

 Resembles the specimen figured by Huxley in the ' Quart. 

 Journ. Geol. Soc' vol. xviii. pi. xi. fig. 2, and provisionally 

 referred to Loxomma. Nearly the whole of the unsculp- 

 tured posterior spine is wanting in this specimen. If 

 rightly referred this specimen will indicate that the 

 thoracic plates were small in comparison with the skull. 



Purchased, 1868. 



