160 LABYR1NTHODONTTA. 



41851 y. Slab showing the terminal faces of eight vertebral centra; 

 from Jarrow. Purchased, 1870. 



R. 1740 a. Two small imperfect vertebrae apparently belonging to 

 the same individual as the mandible No. R. 1740 ; from 

 Northumberland. 



Presented by J. Wood Mason, Esq., 1880. 



45863. Slab showing a number of dermal scutes of the ventral 

 armour ; from Newcastle. These scutes resemble the one 

 figured by Atthey, op. cit. pi. viii. figs. 2, 3. 



Purchased, 1874. 



R. 43. Fragment of shale showing a similar scute ; from Newcastle. 



Presented by T. P. BarJcas, Esq., 1880. 



Genus MACROMERIUM, Fritsch 1 . 



Imperfectly known. Chiefly characterized by the peculiar features 

 of the pelvis, which approximates to that of Sphenodon, the ilium 

 being slender, and the ischium having a very short symphysis, and 

 thereby differing widely from that of Mastodonsaurus. Teeth large, 

 with subcorneal crowns, grooved inferiorly, but towards the summit 

 smooth, flattened on the inner side, and having distinct fore-and-aft 

 carina? ; a distinct pulp-cavity, and the dentine much infolded at the 

 base. Cranial sculpture pitted and irregularly distributed. Ver- 

 tebral centra perforated. Ventral scutes very large. 



Macromerium schwarzenbergi, FVitsch 2 . 

 Syn. Macromerion (Labyrinthodon) schioarzenbergi, Fritsch 3 . 



The type species. Of large size, the skull being probably fully 

 as large as that of Loxomma alltnani. Ventral scutes three times 

 as long as wide. 



Hah. Europe (Bohemia). 



The originals of the following type specimens were obtained from the 

 llolhliegendes {Lower Permian) of Bohemia, and are described 

 and figured by Fraas in his ' Fauna der GaskohleJ The casts 

 ivere purchased in 1888. 



R. 1465. Cast of a fragment of the cranial roof, embedded in matrix. 

 Original figured, op. cit. pi. Ixv. fig. 1 ; from Kounova. 



1 Fauna der Gaskohle, vol. i. pt. i. p. 29 (1879). — Amended from Macro- 

 merion. 



2 Sitzungsb. k. bohm. Ges. Wiss. for 1875, p. 71 (l&7Q>).—Labyrint7iodon. 

 :i Loo. cit. 



