[13] CATALOGUE OF THE FISHES OF NORTH AMERICA. 



Subclass ACTINOPTERI. 



Order I.— SELACHOSTOMI. (G) 



Family XXVI.— POL YODONTID^. (25) 

 45.— POLYODON Lac6pfede. (46) 



100. Polyodon spathula Walbaum. Vw. (73) 



Order J.— GLANIOSTOMI. (H) 

 Family XXVII.— ACIPENSERID^. (26) 



46.— ACIPENSER Liunteus. (47) 



101. Acipenser sturio oxyrhynchus Mitchill. N. Ana. (74). 



102. Acipenser transmontanus Richardson. C. A. Ana. (75) 



103. Acipenser medirostris Ayres. C. A. Aua. (76) 



104. Acipenser rubicundus Le Sueur. Vu. (77) 



105. Acipenser brevirostris Le Sueur. N. S. (78) 



47.-SCAPHIRHYNCHOPS Gill. (48) 



106. Scaphirhynchops platyrhynchus Ratinesque. Vw. (79) 



Order K.— GINGLYMODI.^ (I) 

 Family XXVIII.— LEPIDOSTEID^. (27) 



48.-LEPIDOSTEUS Lac^pfede. (50) 



107. Lepidosteus osseus Linus>ns. V. (80) 



108. Lepidosteus platystomus Rafinesque. V. (81) 



109. Lepidosteus tristcechus ^ Bloch & Schneider. Vs. W. (82) 



Order L.— HALECOMORPHI. (J) 



Family XXIX.— AMIID^. (28) 

 49.— AMIA Linnaeus. (51) 



110. Amia calva Linnaeus. V. (83) 



1 The word Ginglymodi is from ■yiyyT^vub'i, hinge, ezdo?, like, in allusion to the ball- 

 and-socket joints of the vertebrae. 



*The subdivisions o{ Lepidosteus {Cytivdrosteus ; Airaciosteus) certainly have no value 

 higher than specific, and the characters used in distinguishing them are variable and 

 of slight importance. It is often difficult to distinguish L. platystomus, even specific- 

 ally, from L. tristoechus. Specimens from Cuba {tristoechus) are not distinguishable 

 from others from Florida (spatula). 



