Fossil Fish. 339 



The second specimen which I believe to be the posterior dor- 

 sal fin, is most probably of the same species, but belongs to a 

 slightly larger individual. The fin is very markedly lobate, the 

 lobe being 12 mm. in length and about 6 mm. broad near its base. 

 The fin has 20 rays of which the first 4 and the posterior 3 are 

 short. The longer rays at least are articulatetl in more than their 

 distal half. 



The scales in this second specimen are similar to those in the 

 type. 



For this African species I propose the name Goelacantluis 

 afncanus. The beds in which it occurs are believed to be upper 

 Triassic. 



In the same beds are a species of Hyhodus and another small 

 shark of a different genus. The only remains, however, at present 

 known are very imperfect. 



