IN AEOLOSOMA HKMPRICMI (EHR) HEXRIKTTK HKkl.AXT MHKVYIS Institute <)/ /M(>/o/ Hrnssclls ami I'nii'crsity of Montreal Cyst-formation has not often been observed in the Oligochaeta. It was observed for the first time by Beddard ( 1905a. 1905b") for the species Aeolosoma hcuiprichi Ehr. It was his opinion that cyst-formation appearing at the beginning of winter is due to the decrease of the temperature. According to Yejdow>ky ( 18S4i. tin's phenomenon is a resting stage following a long period of asexual reproduction; while Dehorne (1916) considers it to be consecutive to sexual reproduction, which effectively occurs in the months of November and December. Beddard ( lSS ( h and Stole (1889).
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