OBSEllVATIOXS OX THE PLANKXOX OF LOOE POOL. 



339 



Date 

 and Weather. 



Temperature. 



24th October 



Cloudy, flull. 

 Wiiul N. 

 squullj'. 



Variations in 

 the temper- 

 ature of the 

 water. 



Surffice 

 o4-9°F. 



Mi(l-w;iter 



54-6°F 

 (11^ feet). 



Takings. 



Eucoiie-poda. Cyclops strenuua. 



Phyl'opoda. Daphnia reticulata. 



D. longispina. 



Oslracoda. Cypris minuta. 



Rotifera. Asplanchna prio- 



donta. 

 Eucopepoda. Cyclops serratulus, 



C. insignis ") 

 C. affiuis ) 



Phyllopoda. Daphnia reticulata, 



D. longispina. 



Alona ovata. 



Insect larvcB. Chironomys sp ? 



Rotifera. Asplanchna prio- 



donta. 

 Eucopepo la. Cyclops serratulus. 



C. insignis. 

 Phyllopoda. Daphnia seticulata. 



D. longispina. 



Sida brachyura. 



Ostracoda. Cypris minuta. 



Remarks. 



Fairly abundant. Both sexes 

 present. Females about three 

 times more numerous than the 

 males. 



Exceptionallj' abundant at this 

 depth. Many females with ova 

 in the brood pouch, and a very 

 few with ephippia. 



Very scarce. Those present were 

 mostly immature females. 



A very few present. 



A very few present. 



Abundant. Both sexes present. 

 A few females with egg-sacs 

 attached. 



A few of both sexes present. Most 

 of the females were carrying ova. 



Scarce. Newly hatched specimens 

 fairly common. A very few of 

 the adult females were carrying 

 ephippia ; and a few of these 

 winter eggs free were also noticed 



Only a few adult females, and a 

 very few recently hatched speci- 

 mens present. 



Not more than four specimens 

 detected in this gathering. 



Three larva3 observed. 

 Fairly numerous. 



Females scarce. A vei-y few with 

 egg-sacs attached. Males not 

 numerous. 



Only a few of both sexes present. 



Not very numerous. Most of the 

 females with ephippia. 



Scarce. A few of these had one 

 or more ova in brood-pouch in an 

 early stage of development. A 

 very few recently hatched speci- 

 mens of the same species also 

 noticed. 



About an equal number of both 

 sexes present. Mostof thefemales 

 of this species were carrying ova, 

 and a very few had advanced 

 embryos in the brood-pouch. 



One specimen present. 



