58 



b. Slab showing the counterpart of the preceding specimen. 

 Here the anterior part of the skull (missing in the latter) is shown. 

 In both one mandibular ramus is detached from the skull. 



c. Slab showing outline of nine vertebrae probably belonging to 

 this genus ; from Jarrow. There are no traces of the large inter- 

 centra found in Loxomma. Noticed by Baily in the ' Eep. Brit. 

 Assoc.,' 1883, pp. 496, 497, as A. edgei. 



FAMILY DENDRERPETID.^. 

 * ICHTHYERPETUM BRADLEY^. 

 Ichthyerpeton bradleyae, Huxley^ Trans. R. I. Acad. vol. 

 XXIV, p. 367 (1867). 



Erpetocephalus rugosus, Huxley^ op. cit., p. 368. 



From the Coal Measures of /arrow Colliery, County Kilkenny. 



a. Fragment of shale showing the impression of the skull and 

 anterior vertebrae. The skull is similar to the one described by 

 Huxley as Erpetocephalus, while the vertebrae are those of Ich- 

 thyerpetum ; the generic identity of the two specimens to which 

 these names were applied has been pointed out by the writer in 

 the "Cat. Foss. Eept. and Amphib. Brit, Mus.," pt. IV, pp. 168, 

 169. Geological Survey Collection. 



b. Slab showing traces of two skulls. Geological Survey Collection. 



* ICHTHYERPETUM, sp, nov. 

 a. Split slab of shale, showing cranium and mandible of a species 

 larger than /. bradleycs ; from Jarrow Colliery. This specimen 

 shows that the genus is closely allied to Dendrerpetum and 

 Pholidogaster, and has no affinity with Nyrania, near which it 

 has been placed by the writer. 



FAMILY ARCHEGOSAURIDiE. 

 ARCHEGOSAURUS DECHENI. 

 Goldfuss, Beiir. vorwelt. Fauna der Steinkohl, p. 3 (1847). 

 a. The imperfect skull, and counterpart, in matrix; from the 



