NO. 2226. 



DISTRIBUTION OF ENTOMOSTRACA—DODDS. 



71 



ployed a small copper funnel of about 40 cc. capacity, which may be 

 stopped with a cork and easily discharged into any suitable vessel. 

 The funnel was loaded with about 2 ounces of lead to give weight 

 to throw the net out from shore and to cause it to sink below the 

 surface of the water. Such a net may be thrown out 50 to 75 feet 

 from shore, or, by means of a long cord, drawn across small lakes 

 or arms of larger ones. In practice I commonly threw out from 

 several places on the shore and made surface 

 collections by drawing the net in promptly, or 

 deeper ones by allowing it to sink to the desired 

 depth before drawing it in (fig. 9). 



During three seasons of collecting by this 

 method the question often presented itseK 

 whether there is a considerable chance that im- 

 portant species may be overlooked, rendering 

 unreliable any conclusions based upon such ma- 

 terial. Comparisons of collections made at dif- 

 ferent times and at different points on the shore 

 at the same time lead me to beheve that there 

 is httle danger that any but some of the most 

 infrequent species are likely to be overlooked. 

 One weak point in my collections is that they 

 were all made in the summer, which, while secur- 

 ing the majority of species resident in the lake, 

 fails to get those which may be winter residents 

 only. It is probable that in some lakes in lower 

 altitudes there exist species as winter forms that 

 are part of the summer fauna in the higher 

 ones. From some of these lakes only one collection was made, 

 while from others material was secured at frequent intervals during 

 one or two summers. It seems that in the higher lakes, where the 

 summer season is short, one good collection at the proper time may 

 be relied upon to contain aU species; but in those at lower altitudes, 

 where the season is longer, and seasonal succession is more marked, 

 frequent collections are necessary. 



Fig. 9. — JJKAVvlNti OF NET 

 USED IN MAKING COLLEC- 

 TIONS. 



THE FAUNA OF THE AREA STUDIED. 



General nature and distribution. — A tabulated summary of the 

 results of my collections, by groups of lakes, is given in Table 4, 

 page 76. From this it will appear that they contain 55 species 

 including: PhyUopoda, 10; Cladocera, 28; and Copepoda, 17. A3 

 noted in the introductory paragraph, when we add to these species 

 those recorded by other students, we have a list of 71 known for the 

 State. So far as possible I have considered all these records in 



