200 



Marsh — Limnetic Crustacea of Green Lake. 



limnocalanus macburus — Continued. 



No. of 



Total 

 No. 



Per cent. 



Coll. 



0-5 



5-10 



10-15 



15-20 



20-25 



25-30 



30-35 



35-40 



40- • 



10.96.. 



32 



17 



9 



29 



15 









6.25 



5.88 



11.11 



13.79 



13.34 







6.25 

 5.88 

 11.12 

 6.90 

 6.66 



43.75 

 17.65 

 22.22 



44.83 

 26.68 



43.75 



11.96.. 







23.53 



11.11 



3.45 



6.66 



5.88 





41.18 



12.96.. 







44.44 



13.96.. 







27.58 



3.45 

 19.98 





14.96.. 







26.68 



15.96.. 









16.96.. 



42 

 21 

 34 

 35 

 51 

 37 

 7 

 34 

 26 

 56 

 200 

 43 







16.66 



*28*.57 

 17.65 

 28.57 









66.68 

 9.52 

 29.41 

 25.71 

 25.49 

 16.21 

 28.57 

 17.65 

 7.69 



16.66 



17.96.. 







9.52 



2.94 



22.86 



11.76 



28.57 



11.76 



11.53 



28.57 



from 



11.63 



14.29 

 11.76 



5.71 

 11.76 



5.41 



23.81 

 14.71 

 11.43 

 33.34 

 2.70 



14.29 



18.96.. 







2.94 



20.59 



19.96.. 







5.72 



20,96.. 





1.96 





15.69 



21.96.. 





8.11 

 14.29 



2.94 



3.85 

 25. 

 106 



4.65 



67.57 



22.96.. 









28.57 



23.96.. 







5.88 



26.92 



3.57 



niet'rs 



6.98 



11.76 

 3.85 

 30.36 

 0-20 

 16.28 



14.71 



11.54 



5.36 



met'rs 

 9.30 



35.30 



24.96.. 

 25.96.. 



3.85 

 1.78 

 from 



3.85 

 5.36 

 0-2^ 

 6.98 



26.92 



26.96.. 

 27.96.. 



34.88 



9.30 



Limnocalanus macrurus (see PI. IX) occurs in collections at all 

 times of the year, but never in very large numbers. The largest 

 single collection that I made was May 8, 1896. While the 

 numbers were very variable, I think I can say that it was 

 most abundant in the months of May and November, thus hav- 

 ing two maximum periods, — the spring period showing greater 

 numbers. 



In February, March, and April most of the Limnocalani are 

 immature. 



In its vertical distribution Limnocalanus is very interesting. 

 From May to November it is seldom found in the day time in 

 the upper five meters, and only in small numbers in the upper 

 ten. In the winter months it is found at all depths. Thus its 

 vertical distribution would seem to be controlled, in part, at 

 least, by temperature. It also seems to be somewhat sensitive 

 to light, for the night collections in 1894 show a greater number 

 near the surface. As these night collections were not extended 

 through the year, it would perhaps be unsafe to say that Lim- 

 nocalanus comes to the surface in the night, but it is certainly 



