OBSEllVATIONS O:^ THE PLANKTOX OF LOOE TOOL. 



341 



Date I 

 and Weather. Temperature. 



29th Dec. 



Wind S.W. 



very light. 



Sky overcast, 



misty rain. 



Variations in 

 the temper- 

 ature of the 

 water. 



Bottom 45°F, 

 v23 feet) 



Surface 48°F 



Mid-water 



47-6°F. 

 (Hi feet). 



Bottom 47°r 

 (23 feet) 



Takings. 



Rotifera . 



Asplanchna prio- 

 donta. 



Eucope'poda. Cyclops signatus. 

 Phyllopoda. Daphnia reticulata 

 D. longispina. 



Sida brachyura. 

 Alona ovata. 



Eucopepoda. Cyclops insignia. 

 Phyllopoda. Daphnia longispina 



D. reticulata. 



Alona ova.ta. 

 Eucopepoda. Cyclops insignis. 



Phyllopoda. Daphia longispina. 



D. reticulata. 



Alona ovata 1 



A. reticulata > 



Chydorus sphericus ) 



Eucopepoda. Cyclops insignis. 



Phyllopoda. Daphnia longispina 



A fair number of females present. 

 Several of these had a single 

 embryo in an advanced stage of 

 development in the uterus. 



Scarce. A very few females had 

 egg-sacs attached. Both sexes 

 present in about equal numbers. 



Fairly numerous. Many females 

 with ova in the brood-pouch. No 

 males present. 



Not quite so abundant as in mid- 

 water townet. Many of the 

 females with advanced embryos 

 in the brood- pouch. 



Very scarce indeed, 

 specimens present. 



Only young 



A single specimen detected in this 

 gathering, with an embryo in an 

 advanced stage of development 

 in the brood-pouch. 



A very few of botli sexes present. 



Not very numerous. The majoiity 

 of those present were young 

 females, only a very few adults 

 of the same species being seen. 



Scarce. Two specimens in this 

 were carrying ephippia. 



Not many present. 



About the same quantity as in the 

 surface gathering. 



Scarce. Most of the females were 

 carrying ova in the brood-pouch 

 in an advanced stage of develop- 

 ment. A very few young speci- 

 mens of the same species also 

 present. 



Very scarce. Only females present. 



A very few specimens of each of 

 these present. 



Very scarce indeed. 



Not numerous. All these were 

 adult female specimens, is,nd the 

 majority had about six ova in an 

 early stage of segmentation in 

 the brood-pouch. 



