U.S. NATIONAL MUSEUM 



BULLETIN NO. 47, PL. t> 







1. BUANCHIOSTOMA CARIB/KUM. (P. 3.) 



2. TAIL OF POLYPTERl'S 1UCHIR. 



3. PETROMYZON MARINUS. (P. 10.) 



4. ENTOSPHENUS TRIDENTATI:S. (P. 12.) 



