SUB-CLASS V 



GAXOIDEI 



91 



Pachycormus, but with larger teeth, small pelvic fins, and a much extended 

 anal fin. Large teeth rounded in section, of complex structure. H. insignis, 

 Wagn., from Lithographic Stone of Bavaria. H. leedsi, Sm. 

 Woodw., from Oxford Clay, Peterborough. 



Protosphyraena, Leidy 1 (Erisichthe, Pelecopterus, Cope), 

 (Fig. 164). Known only by fragments of head and fins 

 much resembling those of Hypsocormus, but teeth laterally 

 compressed, and snout more produced. P. ferox, Leidy, 

 and other species, in the Upper Cretaceous of Europe and 

 North America. The teeth were wrongly ascribed to Sauro- 

 cephalus, Harlan, by Agassiz. 



(Megaluridae, Zittel ; Halecomorphi, Cope.) 



Family 2. Amiidae. Giinther. 



Fin. 164. 



Tooth of Proto- 

 sphyraenaferox,lie\>\ y. 



Vertebral column well ossified, and flexed upwards behind into Upper chalk ; Maes- 

 the upper part of the rounded caudal fin. Pleurocentra and hypo- 

 centra forming complete alternating discs in part of the caudal region, the alternate 

 discs bearing the neural and haemal arches. Teeth powerful. Branchiostegal rays 

 broad and few ; gular plate large. Fulcra present or absent. Scales very thin and 

 cycloid. Upper Jurassic to Recent. 



Megalurus, Ag. (Figs. 165, 166). Vertebral column much produced into 



Fig. 165. 



Megalurus i legantissimus, Wagn. Upper Jurassic ; Solenhofen, 



Bavaria. 2/3 nat. size. 



7; 



Fig. 166. 



Megalurus polyspondylus, Miinst. Upper Jurassic; Kelheiin. 

 A, Portion of vertebral column, nat. size. B, Scales, enlarged. 



Fig. 167. 



A in in calva, Linn. Head, from !>!•- 

 neath. Recent; South Carolina, brs, 

 Branchiostegal rays; h, Ceratohyal; 

 jug, Gular plate ; mil, Mandible 



the upper caudal lobe ; caudal hemi- vertebrae rather elongated. Fulcra 

 present. Dorsal fin considerably extended, arising opposite the pelvic fins, 



1 Felix, J., Zeitschr. deutsch. geol. Ges. vol. XLII. 1890, p. 278. — Woodward, A. S?n.. Ann. 

 Mag. Xat. Hist. ser. 6, vol. XIII. 1894, p. 510. 



