340 



OBSERVATIONS ON THE PLANKTON OF LOOE POOL. 



Date 

 and Weather. 



30th Nov. 



Wind W. 



light. 

 Sky almost 

 cloudless. 



Temperature 



Bottom 54''F 

 (23 feet). 



Surface 

 45-6°F. 



Variations in 

 the temper- 

 ature of the 

 water. 



Mid-water 



45'3°F. 

 (Hi feet). 



Takings. 



Rotifer a. Asplanchna prio- 



donta. 

 Euco'pe'poda . Cyclops serratulus. 



C. insignis. 

 Phyllopoda. Daphnia reticulata 



I), longispina 



Sida brachyura. 



E'tcopepoda. Cyclops Thomasi. 

 C. insignis. 



Phijllo}ioda. Daphnia reticulata. 



D. longispina. 



Sida brachyura. 



RoHfera. Asplanchna prio- 



donta. 

 Eucopepoda. Cyclops Thomasi. 



C. insignis. 



Phyllopoda. Daphnia reticulata. 



Sida brachyura. 



Remarks. 



Quite abundant. 



A few specimens of both sexes 

 present. Most of the females 

 were carrying the paired egg-sacs 



A very few present. 



Exceptionally numerous. Most of 

 these had ephippia present. 



Very scarce. A very few of these 

 had ova in the brood-pouch in an 

 advanced stage of development. 



Not very plentiful. Both sexes 

 present. A very females with 

 segmenting ova in brood-pouch. 

 A very few recently hatched 

 young also present. 



Only a few present. 



Not very numerous. A very few 

 males present. A few of the 

 females with egg-sacs attached. 



Scarce. The majority of these 

 had one or more embryos in the 

 brood-pouch in an advanced stage 

 of development. Young speci- 

 mens of the same species fairly 

 numerous. No males present. 



Adult females very numerous. 

 The majority of these had one or 

 more embryos in the brood- 

 pouch in an advanced stage of 

 development. 



Only a few male specimens present. 



Very numerous. 



Scarce. 



Not very plentiful. Females far 

 more abundant than the males. 

 Only two femiiles noticed with 

 egg- sacs attached. 



Abundant. Many of the females 

 with twelve developing embryos 

 in the brood pouch. Only two 

 specimens with ephippia. No 

 males present. 



Only a few females present. 



