Freshwater Copepoda 11 j 



The Cayuga lake specimens had spherical egg sacks. It may be noted that 

 this is also true of C. abyssorum Sars. In all the individuals the formula for the 

 spines of the terminal segments of the exopodites of the swimming feet was 

 3, 4, 3, 3. 



The females from Bernard harbour which were measured varied in length, 

 exclusive of the furcal setae, from 1 . 625 mm. to 1 .9 mm., thus not differing much 

 from those found in the United States. 



Although C. strenuus is widely distributed as a cold-water form, in Green- 

 land, Europe, Asia, and Northern Africa, it had not been noted on the American 

 continent until the publication by Marsh in 1912, pp. 249-253, where it is stated 

 that it had been found in collections made by Dr. Evermann in Rock pond, 

 Axton, N.Y. Brehm, 1911, and Stephensen, 1913, p. 76, reported it in Green- 

 land. The author has also found it in a collection in the United States National 

 Museum labelled as from " small, clear lake northern New York. From New 

 York State Museum, through W. B. Van Name." He has also found it in col- 

 lections from Cayuga lake, N.Y., and in the contents of fish stomachs collected 

 in Oneida lake, N.Y. A revision of some of the notes on Green lake, Wisconsin, 

 makes it probable that it is also an inhabitant of that body of water. Doubtless 

 it is widely distributed in America, but is not, generally speaking, found in large 

 numbers. 



Cyclops vicinus Uljanin. 



In a tundra pond at Collinson point on June 13, 1914, were collected a 

 number of specimens of Cyclops which were at first called C. strenuus. It was 

 noted, however, that while agreeing with C. strenuus in all other ways, the spine 

 formula for the terminal segments of the exopodites of the swimming feet was 

 2, 3, 3, 3. This spine formula is true of C. vicinus Uljanin as described by 

 Lillejeborg, 1901, and Sars, 1913. The other differences as pointed out by these 

 authors, appear to be only variations. Schmeil, 1892, says that the spine formula 

 of C. strenuus may be 3, 4, 3, 3, or 2, 3, 3, 3, or 3, 3, 3, 3. Schmeil, too, as 

 remarked before, has stated that he does not consider the spinous armature of the 

 swimming feet as sufficiently constant so that it may be considered a diagnostic 

 characteristic of a species. In the author's experience, however, while there 

 has been found some variation in this spinous armature, in the collections from 

 any given locality, the number of spines has been found practically constant. 

 In all the specimens of the strenuus type examined from the Collinson point 

 collection the formula was 2, 3, 3, 3; while in all the specimens from Cape 

 Bathurst and Bernard harbour the formula was 3, 4, 3, 3. 



C. kolensis Lillj. and C. miniatus Lillj. have the same spine formula for 

 the swimming feet as C. vicinus, and the author can see no good reason for 

 separating them from C. vicinus. 







Cyclops capillatus Sars. 



Plate IV, figs. 4, 6, 8-11. 



1863. Cyclops capillatus Sars. pp. 248-9. 

 1884 Herrick p. 156. 



1895 Herrick and Turner, p. 115. 



Schmeil, p. 152, PI. XIII, fig. 1. 



1898 



1901 Lilljeborg p. 54, PI. IV, figs. 1-4. 



1913 Sars, pp. 43-4, PI. XXIV. 



This species was first described by Sars in 1863, and practically all the 

 published knowledge of the form is in the works of Sars and Lilljeborg. Herrick 

 and Herrick and Turner simply republished the Latin description given by Sars, 

 and stated that the species occurred only in Scandinavia. Schmeil figures the 

 fifth foot, and, in a few words confirms the identity of the species. 



