Cyclops kolensis in North America — Reed 
261 
Fig. 19. Comparison of ratios of measurements of Cyclops kolensis from various populations. A, Length 
of furcal ramus/ width of ramus; B, length of segment 3, endopodite, leg four/ width of same; C, length of 
inner terminal seta of ramus/ length of outer seta of ramus; D, length of inner terminal seta of ramus/ 
length of ramus; E, length of inner terminal spine, endopodite, leg four/ outer terminal spine, endopodite, 
leg four; F, length of segment 3, endopodite, leg four/ inner terminal spine same appendage. 
Populations: a-g as in Fig. 18. 
seta to ramus length quotient exceeding unity. 
Lindberg (1955) gives ratios of various body 
parts of C. kolensis from Lake Baikal and from 
a pond at Aneboda, Sweden. Four animals repre- 
sent each locality. Means of some ratios from 
these populations are compared with each other 
and with those of animals from the Grosser 
Ploner See (Table 6). The Swedish and German 
forms differ most widely from each other. The 
Baikal and Swedish forms show the greatest 
similarity, which, in view of the great environ- 
mental differences, is unexpected. 
Values of the ratios from Table 6 were sub- 
jected to analyses of variance (Table 7). Only 
two ratios had significant F values. These were 
length of outer medial terminal seta as percent 
of the length of the inner medial seta and the 
length of the inner medial seta as percent of 
ramus length. 
Lengths of the medial furcal setae were not 
measured in the Alaskan specimens; however, 
using available measurements it is possible to 
make further comparisons among the present 
samples of C. kolensis and those recorded in the 
literature (Table 8). If the mean values only are 
considered, the German, Polish, Swedish, and 
Baikalense animals tend to have inner seta ex- 
ceeding the ramus length and also to have long 
inner furcal seta as compared with the outer 
furcal seta. But the ranges overlap very broadly. 
Mazepova (1961) studied C. kolensis from 
different habitats and found that it was mor- 
phologically homogeneous over its range with 
the exception of some bodies of water in Siberia. 
The northern form she considered to be C. 
kolensis alaskaensis Lindberg. She gave quotients 
of length of the last three abdominal segments: 
length of rami; Siberian animals were the only 
ones in which this value was over 100%, with 
a range between 100 and 150%. Two females 
from Pt. Barrow were checked for this quotient, 
which varied from 174 to 177%. Mazepova 
