78 



PISCES 



CLASS I 



more or less rounded, very deeply overlapping, and externally striated. 

 Carboniferous ; Scotland. 



Lower 



Family 2. Platysomidae. Traquair. 



Trunk deeply fusiform or irregularly rhombic and laterally compressed. Head 

 hones enamelled; hyomandibular nearly verticcd and mo'uth small; teeth, when 

 present, more or less blunt, chiefly on the pterygoid and splenial bones. Fins with 

 fulcra ; pelvic fins small or absent ; dorscd fin single, much extended. Scales rhombic, 

 deepened on the flank, each with an inner vertical keel projecting as a peg at the upper 

 border. Carboniferous and Permian. 



E'urynotus, Ag. (Plecfrolepis, Ag.). Trunk deeply fusiform. Teeth short, 



obtusely conical to spher- 

 oidal. Pectoral fins 

 large ; dorsal fin arising 

 opposite the pelvic pair 

 and extending to the 

 caudal fin ; anal fin short- 

 based, i/'. crenatus, Ag., 

 from Lower Carbonifer- 

 ous, Scotland; other 

 species from L'eland and 



Belgium. 



Young ; 

 Traquair. 

 Scotland 



Fig. 140. 



CheiroihiS granulosus, Young sp. Coal Jleasures : XuiMi Staftordshire. 

 Restored. Lettering as in Fig. 136 (after Traquair). 



very small, pelvic fins absent. 



Mesolepis, 

 Wardichthys, 

 Carboniferous ; 

 and England. 



Cheirodus, M'Coy 

 (Amphicentrum, Young), 

 (Fig. 140). Trunk deep, 

 rhombic. Pectoral fins 

 Dorsal and anal fins directly opposed, and both 



A 





N.' 



Flutiisumus stritUiig. Ag. Upper Permian (Magnesian Limestone) ; 

 Durham. 1/^ nat. size (restoration after Trafjuair). 



Fig. 142. 



riatysomus parvulus, Ag. 

 .Scale, outer (A), and inner 

 (/>') aspects, twice nat. size. 

 Coal Mp.;isures ; England. 



much extended. Teeth absent, but pterygoid and splenial with denticulated 



