208 LABYRINTHODONTIA. 



R. 367. Electrotype from a fragment of shale, showing the ventral 

 scutes. The original, which is one of the types, was 

 obtained from the Rothliegendes (Lower Permian) of Kou- 

 nova ; and is figured by Fritsch in his ' Fauna der Gas- 

 kohle,' pi. xix. fig. 2. Purchased, 1882. 



Ophiderpetum corvini, Fritsch \ 

 Cloacal plates very large, much curved and strongly toothed. 

 Hob. Europe (Bohemia). 



R. 366. Electrotype from a fragment of shale, showing one of the 

 cloacal plates. The original, which is one of the types, 

 was obtained from the Permian of Kounova; and is 

 figured by Fritsch in his ' Fauna der Gaskohle,' vol. i. 

 pi. xx. fig. 12. Purchased, 1882. 



Ophiderpetum zieglerianum, Fritsch 2 . 



Characterized by the great length of the ventral scutes, which 

 are quite smooth. 



Hah. Europe (Bohemia). 



R. 368. Electrotype from a fragment of shale, showing a mass of 

 ventral scutes. The original, which is the type, was ob- 

 tained from the Gaskohle (Lowest Permian) of Ziegler- 

 schacht, near Nyf an (Pilsen) ; and is figured by Fritsch in 

 his ' Fauna der Gaskohle,' vol. i. pi. xx. fig. 14. Each 

 scute consists of three pieces. Purchased, 1882. 



Suborder BRANCHIOSAURIA. 



Short-tailed Salamandriform Labyrinthodonts, in which the verte- 

 bral centra are barrel-shaped, with a notochordal canal which expands 

 in the middle of each centrum ; ribs short and straight, with a simple 

 expanded head. Teeth with large pulp-cavities, and no plication of 

 the dentine. Occipital region of the skull and the pubis cartila- 

 ginous. There are no dorsal scutes ; and the carpus and tarsus are 

 unossified. 



Family APATEONIDtE. 



In this family the skull is generally longer than in the Protri- 

 tonidce ; the teeth have flutings near the summit ; and all the ver- 

 tebra3 carry ribs. Both the median and lateral thoracic plates are 

 stalked. The form of the parasphenoid is of the same general type 

 as in the Protritonidce, but the stalk is relatively shorter. 



1 Fauna der Gaskohle, vol. i. pt. ii. p. 124 (1880). 2 Loc. tit. 



