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NOTE SPONGES. 

 Freshwater Sponges in Yorkshire.— In the July 1898 number of 

 'The Naturalist' Mr. LI. J. Cocks asks for records of Freshwater Sponges 

 in Yorkshire and the Northern Counties generally. In my examination of 

 the Diatomaceous gatherings, obtained from various sources within a radius 

 of 10 or 12 miles from Doncaster, I have on several occasions come across 

 indications of the presence of both Spongilla lacustris and 5*. flwuiatilis. 

 (Found at Stone, near Roche Abbey, July 1899; in a sediment from Don- 

 caster water, August 1898 ; and at Askern Bog, January 1898.) Probably the 

 most notable instance occurred in treatingasub-fossil depositfrom the borders 

 of Askern Bog with the view of determining the Diatoms present. Both 

 the bi-rotulate spicules of vS. fluviatilis and the fusiform ones of lacustris 



jvere met with in this case in considerable numbers, and were a source of 

 much interest. In endeavouring - to gain additional information on this 

 Subject my friend, Dr. Corbett, secured a fragment of a deposit taken from 

 the Manchester Reservoir about 30 years ago by Mr. Thomas Rogers, 

 who had been commissioned to investigate the cause of a serious trouble 

 with the Manchester water supply. This trouble was found to be due in 

 .1 groat measure to an excessive growth of Freshwater Sponges in the 

 Reservoir. From the deposit which came into my posession I succeeded in 

 making a most interesting and characteristic slide of Spong-e Spicules, of 

 which 1 enclose a photo-micrograph. Both varieties of Spicules are present 

 in vast numbers, and, as a glance at my photograph will show, the gathering 

 is a wonderfully pure one. — M. H. Stiles, Doncaster, 28th August 1899. 



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NOTE- FISHES. 



Rainbow Trout: a Query. The Horncastle Angling Association 

 have gone to considerable expense in introducing Rainbow Trout into the 

 river Bain. These fish are believed to be migratory, and the money may 

 thus have been spent in vain. Can any readers of ' The Naturalist' give 

 any information on this subject. J. Conway Walter, Langton Rectory, 

 Horncastl e, 10th October 1900. 

 moo November i. 



