NO. 1901. 



NOTES OX FRESH-WATER COPEPODA— HARSH. 



253 



Figs. 11-12.— Cyclops .strencus. 11, 

 Fifth FOOT OF SPECIMEN FROM Syria. 



12, FliTH FOOT OF SPECIMEN FROM 



AXTON, New York. X 292. 



This apparently 



basal portion. There is a group of small spines at the outer distal 

 angle of this segment and at the base of the lateral spine. Figure 11 

 is the fifth foot of a Syrian specimen and 

 figure 12 the same structure from an Ax- 

 ton specimen, drawn to the same scale. 



The form of the receptaculum seminis 

 is shown in figure 13. The form of the 

 labrum is shown in figure 14. The sec- 

 ond row of teeth is very distinct. Not 

 enough specimens were examined to 

 make sure that this, which has not been 

 mentioned by other authors, is a con- 

 stant structure, but it is interesting to 

 note that Brady* in his figure of the 

 labrum has a line where the author has 

 found minute teeth; the row of teeth by 

 a lower magnification appeal's as a line. 



In all the specimens examined there 

 was an absence of the customary seta on 

 the basal segment of the fourth swimming foot 

 has not been noted by other authors. 



Schmeil gives as the average length of females 1.5 to 2.5 mm. 



The females of the Axton collections 

 average 1.35 mm, the largest examined 

 measuring 1.525 mm. 



Cyclops strenuus is widely distributed 

 in Europe, Asia, and northern Africa, 

 but has not been reported before from 

 America. It is distinctly a cold water 

 form occurring most abundantly in the 

 colder months. 



Dr. B. W. Evermann collected it in 

 Rock Pond, Axton, New York, on April 

 30. It seems strange that it has never 

 been seen before, for it is probable that 

 it is a form of wide distribution in 

 America. 



In the synonymy, for the most part, 

 Schmeil has been followed. Granting the 

 limits of variation as stated by him, the 

 Figs. i3-i4.-cyc..ops strenuus. 13. species pubhshed by Lilljeborg in 1901, 

 Outline of receptaculum seminis. scutifer, vidnus, miniatus, and Jcolensis 



X 148. 14, Labrum. x 292. i. i j i -j j • .• j -x 



should be considered as varieties, and it 

 would be a matter of pereonal opinion whether or not it is worth 

 while to recognize them under distinct names. 



» 187S, pi. 19, fig 3. 



