LEPIDOSTEOIDEI 



343 



of the jaw, the covering of the cheek with small plates, the presence 



A. 



5. 



Fig. 3-22. 



Lepidost\ us osst us, L. A, vertebra from in front : 

 I ;, vertebral column of trunk, right-side view. (After 

 Balfour and Parker.) 1, convex anterior surface of 

 centrum ; 2, concave posterior surface of centrum : 

 3, neural arch (basidorsal) ; 4, neural canal ; 5; inter- 

 ilorsal cartilage; 6, longitudinal ligament; 7, neural 

 spine; 8, transverse process of centrum (parapophysis). 



If r ^P=S? 



Fir:. 323. 



Heart of Lepidostms osseus, L. I, 

 ventral view. II, conns arteriosus 

 opened. «, atrium ; 6, conus ; e, /, g, 

 transverse rows of valves in conus ; h, k, 

 I, m, four afferent branchial vessels; r, 

 ventricle. (From Gunther.) 



Lepidosteus osseus, L. 1, nostrils ; 2, pectoral. 3, pelvic, 4, anal, 5, caudal, 

 and 0, dorsal tin. 



of an interorbital septum and of paired fulcra, and the absence 

 of a median gular, Lepidotus approaches the structure of this 



