Abstract
DR. ANNANDALE (NATURE, August 18, p. 778) assumes from Mr. B. B. Woodward's letter that this species is a deep-water form, but this is not so. P. clessini is abundant in some of the Welsh and Kerry tarns, where Mr. Charles Oldham and I have collected it in from 1 to 4 ft. of water. It is a form which I have had under observation for some years past—indeed, since I first collected it on Brandon Mountain in Co. Kerry in 1910.
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