338 



OBSERVATIONS ON THE PLANKTON OF LOOE POOL. 



Date 

 and weather. 



20th Sept. 



Fine. Sky 



cloudless. 



Wind N.W. 



light. 



Variations in 

 the temper- 

 ature of tlie 

 water. 



Temperature, 



Bottom 



64°F. 



(23 feet). 



Surface 65°F 



Mid -water 



64°F. 

 (Hi: feet). 



Bottom 6'S°F 



(23 feet). 



Takings. 



Eiicopepuda. Cyclops strenuiis. 



rhyW'poda. Daphnia reticulata 



D. longispina. 



Sida brachyura. 



Insect larvcB. Corethra plumicor- 

 nis. 



Holifera. Asplanchna pi'iod- 



onta. 

 Eucopepoda. Cyclops strennus. 



Phyllopoda. Daphnia reticulata 



D. longispina. 

 Sida brachyura. 

 Ostracoda. Cypris tristriata. 



Rotifera. Asplanchna prio- 



donta. 

 Euxopepodo. Cyclops strenuus. 



Phyllopoda. Daphnia reticulata 

 D. longispina. 

 D. pulex. 

 Sida brachyma. 



Rod/era. 



Asplanchna prio- 

 donta. 



Remark.s. 



A fair number of both sexes 

 present. A few of the females 

 with egg-sacs attached. 



Not very numerous. Only one' 

 specimen carrying an epbippium. 



Scarce. Most of those present, 

 mature females. The remainderl 

 recently hatched specimens of the 

 same sex. One specimen with 

 an epbippium. 



Most abundant. Both sexes/ 

 present in almost equal numbers/ 

 A few of the females had one or 

 two ova in the brood-pouch. 



Two larvse of this species present. 

 One in an early stage of develop- 

 ment, the other late. 



A very few females present. 



Not many present. Males more 

 numerous than females. 



Very abundant. A few females 

 had a single egg in an early stage 

 of development in the brood- 

 pouch. 



Scarce. No young specimens 

 l^resent. 



A very few present. No male 

 specimens detected. 



One specimen. 



Not many present. 



Both sexes abundant. Not many 

 females carrying the paired egg- 

 sacs. 



Abundant. 



Not many adult specimens present. 



Only two observed. 



Fairly numerous. Both sexes 

 present. Most of the females 

 with a single ovum in the brood- 

 pouch. 



A fair number of females of this 

 species present. 



