7<D BULLETIN OF THE LABORATORIES 



This species is frequently found in our canal basins. 



Sp 1 6. Cyclops tenuicornis, Claus. 



Cyclops signatus, G. S. Brady, British Copepoda, Vol. 



I, p. loo; pi. XVII, figs. 4-12. 

 Cyclops tenuicornis, G. S. Brady, British Copepoda, 



Vol. I, p. icp; pi. XVIII, figs. i-'o. 

 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. 



( Ant en nae 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 fluviabilis, 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- l 5' 

 Although not widely distributed, yet this form is very abundant 

 in the few peaty pools where it does occur. 



(Antennae 11 -jointed. ) 



Sp. l 9- Cyclops phaleratus, Koch. 



Cyclops phaleratus, G. S. Brady, British Copepoda, 



Vol. I, p. 116; pi. XXIII, figs. 7-13 

 Cyclops phaleratus, C. L. Herrick, Final Report on 



Minn. Crustacea, p. 161; pi. R, tigs. 6-10. 



This species is rare. 



