CROSSOPTERYGII 



479 



Bay, Canada ; Gyroptycliius, Old Eed Sandstone, Scotland ; 

 fihizodopsis 1 (Fig. 274), Carboniferous of England, Scotland, 

 Silesia, and North America ; Strepsodus, Carboniferous of Great 

 Britain, Ireland, and North America. 



so at 



FIG. 275. Restoration of Tristichopterus alatus. Old Red Sandstone, cl, Clavicle. 

 Remaining reference letters as in Fig. 274. (After Traquair.) 



FIG. 276. Restoration of Eusthenopteron foordi. Upper Devonian of Scaumenac Bay, 

 Canada. The scales have been omitted in the hinder part of the body to show the 

 vertebral column and the radials of the median fins, cl, Clavicle ; i.d, infra- 

 clavicle ; s.d, supra-clavicle ; for other reference letters see Fig. 274. x about *. 

 (After Whiteaves.) 



Fam. 3. Holoptychidae (Dendrodontidae). Scales cycloid. 

 Pectoral fins acutely lobate ; pelvic fins short and somewhat 

 obtusely lobate. Tail heterocercal. Teeth similar to those of 



FIG. 277. Restoration of If oloptychius jlemingi. x ^. (From Traquair. j 



the Ehizodontidae but more specialised, the enamelled dentine 

 infoldings being much more complicated, presenting a radiating 



1 Traquair, Trans. Roy. S'oc. Edinb. xxx. 1881, p. 169. 



