PERCIDZ. 45 
(3) The American Pike-perch group was called Stizostethiwm by Rafin- 
esque, and (4) the Sandres of Europe were called nearly simultaneously 
Lucioperca by Cuvier and Sandrus by Stark. The Lucioperca marina 
Cuv. & Val. (Perca labrax Pallas), if correctly described, has apparently 
no affinity with the genus. 
The following analysis of the characters of these groups has been 
compiled by Prof. Gill and myself after a rigorous comparison of the 
several forms. It may be stated that we have been unable to ascertain 
certainly the character of the pyloric ceca in Mimoperca and Lucioperca, 
the two specimens of each species in the National Museumgeing deprived 
of their intestines :— 
*, Dorsal fins well separated, the interspace between them more than the diameter of 
the eye; the distance from the base of the last spine of the first dorsal and the 
first of the second equal to the space occupied by the last 4 to 6 spines of the 
first dorsal; anal fin II, 12, longer than high; second dorsal I, 17, to I, 21; 
spines of the second dorsal and anal closely attached to the soft rays; last dorsal 
spine scarcely erectile, more or less firmly bound down by the membrane; canine 
teeth strong (American species) : 
t. Soft dorsal ,comparatively short (its base one-fourth shorter than that of spinous 
dorsal) and with about 17 short rays; cheeks, opercles, and top of head more or 
less closely scaled; body depressed, subterete ; size small; pyloric cooca form- 
ing two groups, the primary one of four, unequal, moderate, much shorter than 
the stomach ; the secondary of few (1-3) rudimentary ones, which are sometimes 
BUEGIN MOUs e eae ee Citas Nanere Lepr e tena Satter. bobeetnatee’. tottae ea oe Sane ee CYNOPERCA. 
tt. Soft dorsal rather long (one-sixth shorter than spinous dorsal), with about 20 soft 
rays; cheeks and upper surface of head nearly naked; body more compressed ; 
size large; pyloric coca three, subequal, all long (about as long as stomach), 
Z STIZOSTETHIUM. 
**. Dorsal fins approximated, connected by low membrane, the interspace much less 
than the diameter of the eye; the distance between the last spine of the first 
and the first spine of the second only equalling the base covered by the last four 
. or fewer rays of the spinous dorsal ; spines of second dorsal and anal connected 
with succeeding rays by loose membrane; last dorsal spine erectile; second 
dorsal usually I, 22 or 23; anal fin at least as high as long; body compressed ; 
size large (Kuropean species, the body more or less distinctly transversely 
barred and the first dorsal with series of roundish black spots): 
$. Soft dorsal considerably (one-fifth) shorter than spinous dorsal ; anal fin II, 12, as 
long as high ; canine teeth strong; ‘‘ pyloric ceca 4 to 6”....--.--LUCIOPERCA. 
tf. Soft dorsal somewhat longer than spinous dorsal; anal fin short and high; its 
length two-thirds its height; its rays II, 10; canine teeth weak, not much dif- 
ferentiated ; body strongly compressed as in the genus Perca; “pyloric cca 
CPR COMTI NE \eanwec SS SERA SES As ae Mee Hee EE ee eee ae, ae MIMOPERCA. 
Of American species I know certainly three, the Wall-eyed Pike or 
Yellow Pike (Stizostethium vitreum), the Blue Pike or White Salmon 
(Stizostethium salmoneum), and the Sauger or Gray Pike (Stizostethium 
griseum or canadense). The “Sauger” of the Saint Lawrence, S. cana- 
dense, may be distinct from S. griseum, but at present I think it is not; 
2 
