77 



Sub-class HOLOSTEI. 

 (The Bony Ganoids.) 

 Order VIII. HALECOMORPHI. 

 Family XXIII. AMID.E. 



Genus W. Ami A, L. 



124. Amia calva, L.— Mud-fish ; Dogfish; Grindle. 



Very abundant throughout the State, in the lakes and larger streams, and 

 also common in ponds in Southern Illinois. 



Order IX. GINGLYMODI. 



Family XXIV. LEPIDOSTEID.E. (The Gar Pikes.) 



Genus 65. Litholepis, Raf. 



125. Litholepis tristcechus, Bloch & Schneider. — Alligator Gar. 



(Bui. II, 69; Litholepis spatula.) 



Not common in Illinois, occurring: somewhat rarely in the Ohio and Missis- 

 sippi rivers, occasionally in the Illinois, and in at least a single instance in 

 the Big Muddy, near Carbondale. 



Genus 66. Lepidosteus, Lacepede. 



126. Lepidosteus platystoiii us, Raf. — Short-nosed Gar. 



One of the most abundant of the larger Illinois fishes, rarely occuring, how- 

 ever, in the smaller streams, and confined chiefly to the larger rivers and the 

 lakes and ponds connected with their waters. It is also taken in Lake Mich- 

 igan. 



127. Lepidosteus osseus, L. — Long-nosed Gar; Bill-fish ; Common Gab 



Pike. 



Generally abundant in the larger streams throughout the State, and taken 

 by us in the Illinois, Mississippi, and Ohio. Occurs also in the smaller lakes 

 in Northern Illinois. 



*Sub-class CHONDROSTEI. 



Order X. GLANIOSTOMI. 



(The Sturgeons.) 



Family XXV. ACIPENSERID.^. 



Genus 67. Scaphirhynchops, Gill. 



128. ScaphirhynchojJsplatyrhynchus, Raf. — Shovel-nosed Sturgeon; White 



Sturgeon. 



Taken by us somewhat rarely in the Ohio and Mississippi rivers at Cairo, 

 and in the Illinois at Peoria. 



Genus 68. Acipenser,h. 



129. Acipenser ruhicundus, Le Suer. — Lake Sturgeon; Ohio Sturgeon; 



Black Sturgeon; Stone Sturgeon; Rock Sturgeon. 



(Bui. II, 69; Acipenser maculosus, Acijienssr ruhicundus.) 

 Ohio, Mississippi, and Illinois river? and Lake Michigan. Reaches, in the 

 last, a weight of a hundred and fifty pounds, or more. The characters vary 

 greatly with age and size. 



