344 



OBSERVATIONS ON THE PLANKTON OE LOOE POOL. 



Date 

 and Weather, 



Variations in 

 the temper- 

 ature of the 

 water. 



Temperature. 



24th May. 



Wind N.E. 

 Sky clear. 



Variations in 

 the teoiper- 

 aiure of the 

 water. 



Mid-water 



55-6°F. 

 (Hi feet). 



Bottom 

 54-3°F. 

 (23 feet). 



Sui'face 

 63-9°F. 



Mid-water 



62-6°F. 

 (Hi feet). 



Bottom na^F 

 (23 feet) 



Takings. 



Eucopepoda. Cyclops insignia. 

 Phyllopoda. Diiphnia longispina 



Alona ovata. 

 Eucopepoda. Cyclops insignia. 



Phyllopoda. Daphnia longispina. 



Remarks. 



Exicopepoda. Cyclops insignis. 



Phyllopoda. Daphnia longispina. 



D. reticulata. 

 Sida brachyura. 



Ostracoda. Cypris minuta. 

 Insect Larvae. Chironomys sp. ? 



Eotifera. Asplanchna Bright- 

 welli. 



Eucopepoda. Cyclops insignis. 

 Phyllopoda. Daphnia longispina. 



D. reticulata. 



Sida brachyura. 



Rotifera. Ai-planchna Bright 



welli. 

 Eucopepoda. Cyclops insignis. 



Phyllopoda. Daphnia longispina. 



Scarce. 



More numerous than in surface- 

 net. 



Ostracoda. 



D. pulex. 

 D. reticulata. 

 Cypris minuta. 



Only a few present. 

 Not abundant. 



Most abundant at this depth. 

 Many of the fem.ales carrying 

 ova in an early stage of develop- 

 ment in the brood-pouch. 



Fairly numerous, many females 

 with egg-sacs attached. Only 

 one or two male specimens present 



A few females present. About 

 two dozen of these were carrying 

 ephippia. 



A fair number present. 



Very scarce, about a dozen speci- 

 mens present. 



'1 hree specimens present. 



A single specimen. 



Not more than a dozen specimens 

 present. 



Scarce. A few of both sexes 

 present. 



Abundant, all stages of develop- 

 being present. Only a very few 

 of the adult females had ova in 

 the brood-pouch ; most of the 

 remaining specimens had advanc- 

 ed embryos in that receptacle. 



More numerous than in either 

 surface or bottom townets. No 

 males present. 



Only a few immature females 

 present. 



Fairly plentiful. 



Abundant. Most, of the females 

 had egg-sacs attached. Male 

 specimens scarce. 



Very plentiful. The majority of 

 these were in the same condition 

 as those captured in the mid- 

 water townet. A very few with 

 ephippia. 



Two specimens present. 



Scarce. No males present. 



Six specimens present. 



