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Mr. Ad. Jensen of the Zoological Museum of Copenhagen on 

 his return from Greenland in the autumn of 1906 informed me that 

 he had found freshwater Bryozoa in the vicinity of the colony of 

 Jacobshavn near the Disko-Bay (69° 13' N.). Being conversant with 

 the above facts this message was of course full of interest to me 

 and I owe Mr. Ad. Jensen my best thanks for the readiness with 

 which he handed over the samples to me for closer inspection. 

 As to the locality Ad. Jensen reports. "To the north-east of the 

 colony of Jacobshavn a plain extends for a couple of English 

 miles along the base of the mountains. The plain is watered 

 by a small rivulet, which discharges itself into the harbour. 

 On its way to the harbour it passes through several small lakes 

 or tarns. The Bryozoa were found on the 28®' of August 1906 

 in the bed of the stream at the place where it leaves the 

 uppermost and largest of the small lakes; the height above 

 sea level was ca. 30 m. In this place the river is quite shallow, 

 the bed is covered with stones and partly "moss-grown". 

 Numerous Sticklebacks {Gasterosteus aculeatus) were swarming 

 about besides the brood of the arctic Char [Salmo alpinus). 

 Numerous curiously formed chitinous sheaths housing the pupa 

 of Simulium adhered to the lower sides of the stones. On 

 handling them I observed a colony of Bryozoa fixed on to the 

 lower side of a stone ; on turning round hundreds of stones I 

 at length succeeded in finding one more with a colony attached 

 to the lower side of the stone. Unhappily the stones were both 

 too large to go into any of my glasses so that 1 had no option 

 but to detach the branches of the Bryozoa from them with a 

 knife. The stream in this place was scarcely more than ^/з m. 

 deep. I further looked for Bryozoa on stones in the littoral zone 

 of the lake but without success. However a dredging across 

 one of the small inlets of the lake fetched up numerous Bryozoan 

 branches with statoblasts. The lake itself is a "cold" one being 

 comparatively deep; it is fed by the melting snow of the moun- 

 tains and has an outlet. In contradistinction to such lakes I 



