1862.] 



HODGSON — ULVERSTON. 



31 



List of Species. 



Synedra radians 



Cocconema lanceolatum 



cymbiforme 



Gomphonema acuminatum 



Vibrio 



dichotornum 



intricatum 



Himantidium bidens 



pectinale 



Odontidium Harrisonii j3. . 

 mutabile , 



Denticula sinuata. 

 Tetracyclus lacustris 

 emarginatus 



Tabellaria flocculosa. 

 Mastogloia Grevillii. 



Localities where they are found living. 



Poaka Beck. Near Ulverston, in 



springs. 

 Poaka Beck. Common in streams, 



Ulverston. 



Poaka Beck 



Poaka Beck. Subalpine bogs, Ul 



verston. 



Poaka Beck 



Poaka Beck. Levers Water, " Old 



Man" Mountain, Coniston. 

 Poaka Beck. 

 Poaka Beck. Hills, Ulverston. 



Levers Water, " Old Man " 



Mountain. 

 Poaka Beck. Levers Water, " Old 



Man" Mountain. 

 River Thames. 

 Near Ulverston 



River Spey 



Rivers, " mountain-streams, and 



cascades." 

 Poaka Beck. Road-sides north of 



Lindale Moor. 

 Mossy springs, Ulverston. 



Other deposits in which they occur. 



Lough Mourne. Peterhead. 



Lough Mourne. Cantyre peat. 



Peterhead. 

 Lough Mourne. Peterhead. 

 Lough Mourne. Peterhead. 



Lough Mourne. Peterhead. 

 Premnay peat. 



Dolgelly earth. Mull. 

 Dolgelly earth. Mull. 



Lough Mourne. Peterhead. 

 Dolgelly earth. 



Taking for a moment Mr. Bolton's view of the deposit, a ques- 

 tion would arise respecting the " Leaves of Beech " said to have 

 been discovered in it. 



Now there is no record, I believe, of the Fagus sylvatica occurring 

 truly wild so far north. Therefore, if correctly identified, the spe- 

 cimens would seem to have belonged to a cultivated tree ; otherwise, 

 we have yet to learn why the beech has, since that period, become 

 extinct as a native. 



Eeturning to my own views, I cannot say that there are no beech- 

 trees all along the banks of the Poaka Beck ; none were observed ; the 

 alder, oak, ash, maple, hazel, thorn, <fcc. occur — the first, perhaps, 

 predominating. 



Great quantities of very fine mosses grow in and about all the 

 springs ; we find their debris in all the diatomaceous gatherings. I 

 also found, by careful washing, fragments of moss still adhering to a 

 pebble from the deposit. 



Rushes grow in great abundance ; also ferns, especially the Hard 

 Fern (Blechnum boreale) and the Common Bracken (Pteris aquilina). 

 Spores of the latter have been detected in the deposit, with a frag- 

 ment of a frond of the same. 



