OBSERVATIONS ON THE PLANKTON OP LOOE POOL. 



337 



Date I 

 and weather, Temperature. 



Variations in 

 the temper- 

 of the water 



Mid-water 



73°F. 

 (lU feet). 



Takings. 



Bottom 

 70-9° F. 

 (23 feet). 



29th August. 



Fine. 



Sky almost 



cloudless. 



Calm. 



Surface 65°F 



Variations in 

 the temper 

 of the water. 



Mid-water 



65°P. 

 (IH feet). 



Eucopepoda. C3'clops strenuus. 



C. signatus. 



Phyllofoda. Daphnia reticulata 

 D. longispina. 



Ejicopepoda. Cyclops strenuus "^ 

 C. signatus ) 



Phyllopoda. Daphnia reticulata. 

 D. longispina. 



D. pulex. 



Insect larvce. Corethra plumicor- 

 nis. 



Eucopepoda. Cj'clops strenuus. 



C. signatus. 

 Phyllopoda. Daphnia reticulata. 



Bosmina longirostris 



Eucopepoda. Cyclops strenuus. 

 Phyllopoda. Daphnia reticulata, 



D. longispina. 

 Sida brachyura. 



Remarks. 



Females not very numerous. 

 About a dozen with egg-sacs 

 attached. No male specimen 

 present. 



Scarce. A few females carrying 

 egg-sacs. No male specimens 

 present. 



Scarce. 



Not abundant. Those present 

 were mostly immature specimens. 

 A few specimens with ephippia. 



Both present in about equal 

 numbers. Several of C. signatus 

 with egg-sacs attached. No male 

 specimens of either species 

 present. 



Adult specimens fairly abundant. 



Very scarce. Not more than a 

 dozen specimens present. 



Two specimens only detected in 

 this gathering. 



No male specimens of Phyllopod 

 present in any of the gatherings. 



A number of larvK in an early 

 stage of development captured at 

 this depth. 



Not many present. Most of the 

 females with egg-sacs attached. 



Fairly nunierous. No male speci- 

 mens of either species present. 



In abundance. Many of them 

 with ephippia ; several with ova 

 in brood pouch. 



One specimen. 



A few Pupa skins of Corethra 

 plumicornis. 



Not very numerous. Several 

 females with egg-sacs attached. 

 No male specimens present. 



Fairly abundant. Several speci- 

 mens with ova in an early stage 

 of development in the brood- 

 pouch ; also a very few with 

 ephippia. 



Abundant. Only a very few of 

 these had ova in the brood-ponch. 

 Young specimens of the same 

 species abundant. 



A few of both sexes present. 



