OBSERVATIONS OX THE PLANKTON OF LOOE POOL. 



343 



Date 

 and Weather. 



26th Mil rch. 



Wind N. 



squal'y; 



Rain & sleet, 



at times. 



Variations in 

 the teniper- 

 nture of the 

 water. 



24th April. 



Wind rouufl 



with the sun. 



Fine. 



Temperature 



Bottom 45°F 

 (23 feet) 



Surface 42°F 



Mid-water 



42-6°F. 

 (Hi feet). 



Bottom 43°F 

 (23 feet). 



Surface 

 56.6°F. 



Takings. 



Infusoria. Peridinium tabulat- 



Rotifera. 



Synchseta pectinata 



Triarthra mystacina 

 Eiicopepoda . Cyclops insignis. 

 Pliyllopoda. Daphnialongispina. 



Eotifera. Synchseta tremula. 



Eucopcpnda. Cyclops strenuus. 

 Phyllofoda . I'aphnia longispina. 



D. pulex. 



Chydorus sphericus 



Insect Larvae. Chironomys sp. ? 



Sessile-eyed ) » n , ■ 



Crustarea j ^^^""^ aquaticus. 



Infusoria. Peridinium tabulat 



um. 

 Rolifera. Triarthra mystacina 



Synchfeta tremulu. 



Eucnxiepoda. Cyclops serratulus. 



Phyllopoda. Daphnia longispina. 



Chydorus sphericus. 



Rotifer a. Anursea aculeata, 



Eucopcpoda. Cyclops insignis. 



C. Thomasi. 

 Phyllopoda. Daphnia longispina 



Chydorus sphericus 



Remarks. 



Abundant. 



Most numerous at this depth. A 

 few specimens had two, and a 

 few three, ova attached to the 

 posterior extremity of the body. 



A few specimens present. 



A very few of both sexes present. 



Scai'ce. All the adult females 

 carrying ova in the brood-pouch. 

 Immature forms of the same 

 species more numerous than the 

 adult ones. 



About a dozen specimens present. 



Only a few present. 



Very scarce. Young specimens of 

 the same species fairly abun- 

 dant, 



A very few young females. 



Fairly abundant. 



Four specimens present. 



One specimen. 



Cobalt blue in colour, scarce. 



With ova attached, not abundant. 



Fairly numerous. 



Only a vei-y few present. 



Four feaiales present. All of 

 these had embryos in brood-pouch 



Plentiful. A few with ova in the 

 brood-pouch. 



Abundant ; many specimens carry- 

 ing ova. 



All other specimens as in mid- 

 water gathering-. 



Scarce, about a dozen male speci- 

 mens present. 



One specimen only. 



Not abundant. A few of the 

 females with ova in brood-pouch. 



Fairly numerous . M any with ova 

 in the brood-pouch.. 



