206 LABTEINTHODONTIA. 



R. 360. Electrotype from a fragment of shale, showing a consider- 

 able portion of the skeleton, without the skull. The 

 original was obtained from the Gaskohle (Lowest Permian) 

 of Nyfan (Pilsen), and is figured by Fritsch in his ' Fauna 

 der Gaskohle/ vol. i. pi. xvii. fig. 1. Purchased, 1882. 



R. 361. Electrotype from a fragment of shale, exhibiting the skull 

 and cervical vertebrae. Original from Nyf an ; figured by 

 Fritsch, op. cit, pi. xviii. fig. 1. Purchased, 1882. 



Dolichosoma (?) angustatum, Fritsch '. 

 Founded on an imperfect skull with anchylosed frontals, which is 

 provisionally referred to this genus, but may belong to Ophiderpetum. 

 Hob. Europe (Bohemia). 



R. 362. Electrotype from a fragment of shale, showing the skull. 

 The original is the type, and was obtained from the Gas- 

 kohle (Lowest Permian) of JSTyf an (Pilsen) ; it is figured 

 by Fritsch in his ' Fauna der Gaskohle,' vol. i. pi. xxi. fig. 1. 



Purchased, 1882. 



Genus OPHIDERPETUM, Huxley 2 . 

 Skull imperfectly known, but probably shorter and wider in front 

 than in Dolichosoma. Yertebraa about 100 in number. Ribs with 

 a dorsal and a ventral process near the proximal extremity. Ven- 

 tral armour in the form of oat-like scutes ; dorsal surface of the 

 body covered with shagreen-like tubercles ; toothed plates in the 

 neighbourhood of the cloaca. 



Ophiderpetum brownriggi, Huxley 3 . 



Syn. Ophiderpeton nanum, Hancock & Atthey 4 . 



The type species. Length of skull about 0,042 (1*6 inches) ; 

 total length of large examples exceeding 0,534 (21 inches). 



O. nanum was founded on a small specimen from Northumberland 

 which cannot be specifically distinguished from the present form. 



Hob. Europe (Ireland and England). 



41851 1. Fragment showing the impression of the anterior part of 

 the skeleton of a small individual ; from the Coal-Measures 



1 Fauna der Gaskohle, vol. i. pt. ii. p. 117 (1880). 



2 Trans. Boy. Irish Academy, vol. xxiv. p. 364 (1867).— Ophiderpeton. 



3 Loc. cit. 



4 Ann. Mag. Nat. Hist. ser. 4, vol. i. p. 276. See also Nat. Hist. Trans. 

 Northumb. & Durham, vol. iii. p. 79 (1869). 



