360 MR. J. M. BROWN ON FRKSHWATER RHIZOPODS 



EXPLANATION OF PLATE 49. 



Fig. 1. Head of Ceratucheilus Winn-Sampsoni, Wesche, S • 



2. End of proboscis of C. Winn-Sampsoni, highly magnified and seen from the 



dorsal side. 



3. Plate covering the base of the labinm of same insect. 



4. End of proboscis of C. lonc/irostris, "Wesche, highly magnified and seen from the 



ventral side. 

 ' 5. Wing of Neoceratocheilus Grahand, Wesche. 



6. Wing of C. Winn-Sainjjsoni. 



7. Wing of C. longirostris. 



8. Antenna of C. Winn-Sampsoni, c? • 



9. Antenna of C. Winn-Saonpsoni, 5 . 



10. Antenna of C. longirostris, c? . 



11. Bifid hair of leg found on the species of Ceratocheilus. 



Freshwater RhizopoJs from the English Lake District. By James 

 M. Brown, B.Sc. (Commmiicated b}^ Prof. A. Dendy, F.R.S., Sec.L.S.) 



(Plate 50.) 



[Read 18th November, 1909.] 



For the purpose of studying the variation and distribution of Freshwater 

 Rhizopods, collections were made from various localities in the English Lake 

 District. Though only a small area was explored, some interesting results 

 have been obtained. The material, which consisted partly of collections o£ 

 sphagnum and other bog-mosses, and partly o£ sediment and vegetation from 

 tarns and lakes, was brought home and carefully washed and examined. 



About 50 species of Rhizopods were identified, many of them common and 

 familiar forms, but others, again, are less well known, while a few do not 

 seem to have been recorded from this country. Among these, Paulinella 

 chromatopliora, Lauterborn, is of interest, having been found in only a few 

 places on the Continent and in N. America, and only as a single specimen 

 from Loch Ness in Scotland. 



Naturally, many of the specimens found wei"e empty tests, notably those 

 of species of Diffiugia, Euglyplia, Assnlina, and Trineina, but in most cases 

 active individuals also occurred. 



It will be seen that some species — e. g., Dlfflugia ohlonga (^■=D. 2?i/riformis\ 

 D. constricta, Centropy.isis aeideata, JVebela collaris, Quadvula symmetrica, 

 Cyplioderia ampulla, Euglyplia alveolata, and Trinema eiichelys — occur in all 

 or nearly all the collections examined. This is probably due to the fact that, 



