45^ Bulletin American Museum of Natural History. [Vol. XIX. 



mx. maxilla, 

 na. cp. nasal capsule. 

 nar. nares. 

 n. sp. neural spines. 

 oc. occiput, 

 op. operculum, 

 orb. orbit, 

 par. parasphenoid. 

 pelv. gird, pelvic girdle, 

 pi. h. pleurohsemocentrum. 

 p. op. preoperculum. 

 post. pr. posterior transverse 

 process. 



pro. p. propterygium. 



p. sp. pectoral spine. 



pt. pterygoid. 



qu. quadrate. 



rost. rostrum. 



rost. t. rostral teeth. 



shag, shagreen. 



s. op. suboperculum. 



spl. t. splenial teeth. 



V. a. neural arches. 



V. c. vertebral centra. 



V. f. ventral fin. 



V. f. s. ventral fin support. 



