184 



LABYRINTHODONTIA. 



and separated by a deep notch from the posterior expansion of the 

 supratemporal. 



It has been suggested by Gandry 2 that this genus is identical with 

 Sclerocephalus, Goldf uss 2 ; but if Zittel 3 is correct in identifying 

 Weissia, Branco 4 , with the latter, that genus will be distinguished 

 by the slight development of the epiotic cornua, and the absence of 

 a notch between the epiotic and the supratemporal. In the so-called 

 Weissia the lateral borders of the cranium are convex instead of 

 concave as in Actinodon. 



Actinodon latirostris (Jourdan 5 ). 



Syn. Archegosaurus latirostris, Jourdan 6 . 

 Actinodon latirostris, Gaudry 7 . 

 Actinodon frossardi, Gaudry 8 . 



The type species. Skull (fig. 45) about one third longer than 

 Fig. 45. 



Actinodon latirostris. — Frontal aspect of the cranium, with the sculpture 

 omitted ; from the Lower Permian of Saarbruck. f . Pt.F, postfrontal ; 

 Ponx, premaxilla ; other letters as in fig. 31 (p. 143). 



1 Mem. Soc. Hist. Nat. d'Autun, vol. i. p. 29 (1888). 



2 Ueitr. vorwelt. Fauna d. Steinkohlengebirges, p. 13 (1847). 



3 Handbuch der Palaeontologie, 1 Abth. iii. Band, 2 Lief. pp. 391, 392. 



4 Jahrb. preuss. geol. Landesanstalt for 1886, p. 22 (1887). 



8 Verh. nat. Ver. preuss. Eheinl. vol. vi. p. 78 (1849). — Archegosaurus. 



6 Loc. cit. 7 Nouv. Archiv. d. Museum, vol. iii. p. 31 (1867). 



9 Bull. Soc. G6ol. France, se>. 2, vol. xxv. p. 577 (1868). 



