The Relation of Mollusks to Fish in Oneida Lake 301 
Faminty Harpacricip». 
Canthocamptus northumbricus Brady. From stomach of 
Manitou Darter. 
Canthocamptus staphylinus Claus. From stomach of Mani- 
tou Darter. 
The various groups of Entomostraca are more or less 
extensively treated, and illustrated, in the following papers, 
the full references of which will be found in the bibliography : 
Herrick and Turner, 1895; Marsh, 1895, 1910; Birge, 1895. 
1897 ; Forbes, 1897; Sharpe, 1903. . 
Crass Mazacostraca. 
ORDER DECAPODA. 
SUBORDER MACRURA. 
Famity Astactp® (Crawfishes). 
The crawfishes were determined by Dr. A. E. Ortmann. 
Cambarus bartoni robustus (Girard). 
Young and half-grown specimens were common at station 
XVI. These were males and females of the II form. Found 
also in the stomachs of Pickerel and Ling. This is appar- 
ently the first record of this race from Oneida Lake. 
Typical bartonz is a form living in small streams and springs, 
but the race robustus prefers creeks, and larger streams. In 
Lake Huron and Georgian Bay it is found in the lake, in 
situations similar to those of Oneida Lake. 
Cambarus propinquus Girard. 
Young specimens, mostly males of the I form were com- 
mon at station II], habitats 2 and 3, and stations XVI, XX 
and XX XIII. This species was also found in the stomach 
of the Ling. The remains of crawfishes, either propinquus 
or bartoni robustus, were noted in the stomachs of the Rock 
Bass, Yellow Perch, Manitou Darter, Pickerel, and Horned 
Dace. Both species were abundant under and among stones 
