24 



PISCES 



pterygium of pelvic fins segmented, fringed on one side with a series of carti- 

 laginous rays, and continued behind into the spine-shaj)ed clasper in the male. 

 Two small anal fins, directly supported by the haemal arches. Caudal fin 





Fig. -U. 



rieuracanthns (XenoMiiithus) (kclwni, Goldf. Lower Permian ; Brauiiau, 

 Bohemia, x i/o. A, Anterior portion of fish. li, Detachetl teeth, magnified 

 (after F. Roenier). 



Fig. 4-2. 



PleHracanthiis(Orthacanthus) 

 hnhemicus, Fritsch. Lower 

 Fenuiaii (Gas - Coal) ; Krot- 

 schow, Bohemia. A, Side 

 view. B, Hinder view. C, 

 Transverse section. Natural 



I'kwracanthus {Diplodiis) bo- 

 hemicus, Quenst. Teeth in 

 side view (A), and hinder 

 view (B). Lower Permian 

 (Gas - Coal) ; Xy?an, near 

 Pilsen, Bohemia. Natural 



Pilsen 

 size 



separated 1)oth from the anals and from the dorsal. Skin probably destitute 

 of shagreen. 



Complete skeletons are known from the Rothliegenden of Lebach, near 

 Saarbrucken, in Ehenish Prussia, and of Braunau and Ruppersdorf in Bohemia; 

 from the Lower Permian Gas-Coal of Bohemia ; from the Coal Measures of 

 Commentry in France (Fig. 40) ; and from the Lower Hawkesbury Formation 

 of New South Wales. Complete skulls have been found in the Coal Measures 



