ADDENDA. 355 



On page 188, after H. 2^((lust7ns^ acid: 



2. (b) R. areolata, B. & Gr. Hoosier Frog. Head 

 broad; bodv, head and sides with the o-round color 

 largely predoiriiiiatiiig, and with narrow rings of a 

 2:reenish slate color, which become larg-er and more 

 irregular posteriorly; hind legs black, crossed with 

 irreo'ular lines of yellowish slate color; fore limbs simi- 

 larly marmorate; tympanum black with pale ring; below 

 chiefly yellowish white; toes very long; size medium ; 

 L. oj. Benton Co., Indiana, lately discovered by Mr. 

 E. F. Shipman, South to Texas. {liana circulosa. 

 Rice & Davis. Ed. 3.) 



On page 271: 



Genus SALMO. 



Since the part of this work referring to the Salmonidm 

 has been stereotyped, Professor Gill and the writer have 

 been enabled to review the various species of that family 

 found in the United States. Under the genus " /S'«/mo," 

 as defined in the text, at least four very distinct genei'a 

 are confounded, which may be briefly diagnosed as 

 follows: 



* Anal fin elongate, of 14 to 17 rays, vomer narrow, long, flat, 

 with weak teeth, no liyoid teeth ; snout in adult males in the 

 spawning season in typical species greatly distorted, the 

 premaxillaries prolonged, hooking over the lower jaw, 

 which in turn is greatly prolonged upward and forward 

 and somewhat hooked at tip; the teeth of the premaxillavies 

 and of the tip of the lower jaw being then greatly enlarged.- 

 a fleshy hump also developed before the dorsal tin ; species, 

 Uack-spotted. Oncohhyncuus, 1. 



** Anal fln short, of 9—13 rays. 



f Vomer flat, its toothed surface plane ; teeth on the shaft of 

 the vomer in two alternating rows or in one zigzag row. 

 placed directly ou the surface of the bone, not ou a free 



