70 
BULLETIN OF THE LABORATORIES 
This species is frequently found in our canal basins. 
Sp 1 6 . Cyclops tcnuicornis , Claus. 
Cyclops signatus, * G. S. Brady, British Copepoda, Vol. 
I, p. loo; pi. XVII, figs. 4-[2, 
Cyclops tenuicornis, G. S. Brady, British Copepoda, 
Vol. I, p. 102; pi. XVIII, figs. I- 10. 
Cyclops tenuicornis, C. L. Herrick, Final Report on 
Minn. Crustacea, p. 153. pi. R fig. 16. 
This species is very abundant in many of our ponds and canal 
basins. Here we have two distinct varieties. In one variety the 
knife-edge upon the distal joint of the antennae is smooth, in the 
other it is toothed. This second variety might, with propriety, be 
divided into two sub-varieties. In one, the usual case, the teeth upon 
the knife-edge are small triangles; in the other they are stout hooks. 
The case where the teeth are small triangles corresponds to C. signatus^ 
Koch. 
{^Anten 7 iae 12-jointed.) 
Sp. 17- Cyclops serrulatus, Fischer. 
Cyclops serrulatus, G. S. Brady, British Copepoda, 
Vol. I, p. 109; pi. XXII, figs. 1-14. 
Cyclops serrulatus, * '''■ C. L. Herrick, Final Report on 
Minn. Crustacea, p. 157; pi. O, figs. 17-19. 
This species is common in all of our weedy ponds. 
Sp. 18. Cyclops Uuviatilis, Herrick. 
Cyclops fluviatilis, '''' -='■ C. L. Herrick, Final Report on 
Minn. Crustacea, p. 159; pi, Q5, figs. 1-9. 
Cyclops fluviatilis, C. L. Herrick, Alabama Crustacea, 
P- 15- 
Although not widely distributed, yet this form is very abundant 
in the few peaty pools where it does occur. 
{Afite?inae ii-jointed.) 
Sp. 19. Cyclops phalcratiLS, Koch. 
• 
Cyclops phaleratus, '=■ G. S. Brady, British Copepoda, 
Vol. I, p. 1 16; pi. XXIII, figs. 7-13 
Cyclops phaleratus, C. L. Herrick, Final Report on 
Minn. Crustacea, p. 161; pi. R, figs. 6-1O. 
This species is rare. 
