CYPRINIDZ. 55 
belly white; fins black, spotted as in H. lucius. Nearly every writer 
who has mentioned the Muskallunge has confounded it more or less 
‘with H.lucius. Giinther’s statement, “ body with large rounded whitish 
spots,” applies to H. lucius, and not at ail to LH. nobilior, the color in 
the latter species being gray, with roanded blackish spots. 
I have compared European and American examples of Hsox lucius, 
and ain unable to find any difference whatever. 
DORYSOMATIDAL. 
40. DORYSOMA CEPEDIANA, (Le 8.) Gill. 
Subsp. HETERURA, (Raf.) Jordan. 
Comparison of specimens of Dorysoma from the Wabash River with 
others from Chesapeake Bay have convinced me that all properly be- 
long to one species, but that our inland form may be recognized as a 
subspecies, for which the name heterura* may be retained. Var. hete- 
ura differs chiefly in form; the back is much less arched, the axis of 
the body in specimens of about a foot in length being about half nearer 
the dorsal than the ventral outline. In cepediana, the axis of the body 
is usually about midway. The greater arch of the back in cepediana 
brings the beginning of the dorsal fin nearer snout than base of 
caudal; in heterura, the dorsal is about midway. The dorsal fila- 
ment is usually lenger in heterura, commonly longer than head; in 
cepediana, it is usually shorter than head. The less elevated nape 
renders the head of heterura rather more slender. 
The name Dorysoma may as well be spelled correctly in accordance 
with its etymology. 
CYPRINIDA. 
GENERA OF AMERICAN CYPRINIDA:, 
The following is a semi-artificial key to the genera of American Cypri- 
nide which I am at present able to recognize. 
Algoma Grd. I refer to Hybognathus, as one species which I have exam- 
ined, A. amara has the alimentary canal elongate, and no characters 
* Clupea heterurus, Ra¥., Am. Monthly Mag. Sept. 1818, 354, = Dorosoma notata, RaF., 
Ich. Ob. 1820, = Chatoéssus ellipticus, Kirv., 1838. 
