1914.] 



NATURAL SCIENCES OF PHILADELPHIA. 



59 



(1) Fifth foot 



C. fimbriatus Fischer. 



C. fimbriatus var. 

 poppci Rehberg. 



with a spine and two setae, 

 the spine circled at its 

 base by a row of minute 

 spinules. 



(2) Receptaculum semi- "may reach the anterior 

 nis border of first abdominal 



segment" (Schmeil). 



with two spines and a seta, 

 one spine phimose, and 

 no row of spinules at the 

 base of either. 



narrow, low lying, ellipse 

 (fig. 9, PI. IV), with 

 slight indentation in mid- 

 dle of anterior border. 



(3) Fourth a b d o m i n a 1 serrations stop at side ofiserrations turn up (fig. 6, 



segment 



(4) Transverse row of 



serrations on sty- 

 lets 



(5) Stylets 



anal opening. 



Pi. IV). 



form semicircle about sty- extend longitudinally (fig 



lets stopping above lat- 

 eral spine. 



narrow, set far apart, 

 almost equal to last three 

 abdominal segments. 



6, PI. IV). 



shorter, inner margins 

 almost meet, length 

 equal to last two abdomi- 

 nal segments. 



Schmeil notes further minute differences in the structure of the 

 male first antennae. 



N. B. — Since the compilation of the above table I have had occasion to examine 

 collections from Lake Winnepesaukee, N. H., in which a form occurs which 

 bridges over the gap between type and variety as regards character No. 4. In 

 these forms the transverse row of serrations on stylets is exactly as in the type 

 form as figured by Schmeil, but the proportional length of stylets agrees with var. 

 poppei and not with the type form. 



List of Cyclopid.e Recorded from a Single Small Pond in the 



Vicinity of Haverford, Pa. 



(The above small pond is on the estate of Mr. McFadden, directly 

 on the south side of the Philadelphia and Western Railroad tracks 

 and to the right of the bridge that crosses these tracks at Haver- 

 ford station.) 



Geniia CYCLOPS. 

 I. Subgenus CYCLOPS Glaus s. str. 

 1. Cyclops Viridis var. insectus Forbes. 



Not described in this paper, but an abundant form. 

 "2. Cyclops bicuspidatus Claus. 



II. Subgenus MACROGYCLOPS Claus. 



3. Cyclops fuSCUS Jurinc. 



'4. Cyclops albidus Jurine. 



