Nor til American Frcsh-ivatcr Cyclopidie. 41 



Yar. brevispinosus Hep.rick. 

 (PI. XL, Fig. 1 and 2.) 



('yclops hrevispmosHs, Herrick. '84, p. 148, PI. S. Fi^. 7-11. 

 Cyclops b}-evispi7wsus, Mjirsh, '91^, pp. 20o-'20G, PI. IV., Fi"^. 11. 12. 

 Cyclops hrevispinoi^vs, Herrick and Turner. "95. p. 95, PI. Will.. 

 Fio-. 1-4: XXIV., Fi.--. 7-1 -2. 



This sx)eeies of" Herrick's, which I reduce to a variety, is dis- 

 tinguished from typical ('. rtrhVix, as follows: 1. By the 

 form of the outer terminal spine of the stylet, which is short, 

 hroad, and knife-like. This fcn-m of spine is connected in 

 series (PI. XL, Fig. 1) with the slender spine of the variety 

 /■//.S7V7//.S'. '2. By the tifth foot (PI. XL, Fig. 2). Li this 

 appendage the small spine is never a part of the segment as it 

 may he in the European //'r/VZ/.s- and always is in the American 

 form. This spine is also longer than in riridis and is lanceolate 

 in shape. 3. By the armature of the swimming feet. The 

 spines of these appendages are extravagantly long and heavy. 

 While at first sight these differences might seem sufficient for 

 the complete separation of the two forms, the distinguishing 

 characters are in most species of ('i/<-I(>p>< so variable that it 

 seems to me best to consider lircrispiitoxus as merely a variety. 



The r('r('j)t<(ridiiiti Hcni'niiy; is as in inscctiiH. 



I find this variety in collections from Lakes Michigan, 

 Manitoba, Okoboji, (Iowa) ; and from Lake Winne])ago, Green 

 Lake, and Lake Geneva in AVisconsin ; from Swan Lake in 

 Montana, and Lake Pend d'Oreille in Idaho ; from the Detroit, 

 Calumet, and Illinois Livers ; and from Sand, Fox, Quiver, 

 Doghsh, Phelps, and Thompson's lakes — all in Illinois. It 

 is never especially alnindant l)ut seems to be quite generally 

 distributed. 



Yar. insectus Fop.hes. 

 (PI. XL, Fig. 8-6.) 



Cyclops insectus, Forbes, *82:i. p. i;49. PI. IX.. Fi^. (i. 

 Cyclops parcus, Herrick, ■82a, p. 229. PI. VI.. Fio^. 12-15. 

 Cyclops insr-ctus, Herrick. '84, pp. 151, 152, PJ. U, Fig. 9. 

 Cyclops viridis. Clragin. ^83, p. 68, PI. IV.. Fig. 8-16. 

 Cyclops iiniangidatxs. Cragin, "83, p. 71, PI. IV., Fig. 17. 

 Cyclops insectus, Schmeil. "92, p. 95. 



