Beardsley, on a Diatomaceous Deposit. 
147 
I subjoin a list of the Diatomacese, which has been kindly 
supplied me by Professor Smith, of Cork, as the species he has 
detected in a specimen I forwarded to him for examination. 
I have little doubt but that many more forms will eventually 
be observed in it, and from the elevated position at which the 
deposit occurs, it includes those species which are moun- 
tainous, or subalpine chiefly ; and in looking over the list, as 
supplied by Professor Smith, it will be observed that many 
species are named which have also been found in high 
Alpine regions. 
Observations as to the localities of Diatoms are as yet too 
contracted to generalise from, still there appears ground for 
the belief that particular forms are peculiar to diflPerent alti- 
tudes, and that altitude rather than other causes will give 
variety of species. 
LIST FORWARDED BY PROFESSOR SMITH. 
DiATOMACEiE IN LeVEN WaTER. 
Eunotia tetraodon. Gomphonema dichotomum. 
diadema. tenellum. 
bidentula. Synedra biceps. 
Cymbella Helvetica. Nitzschia curvula. 
Navicula serians. linearis. 
rhomboides (3. Himantidium bidens. 
Bacillum. pectinale. 
crassinervia. undulatum. 
forina (3, . majus. 
Stauroneis anceps, majus /3. 
gracilis. gracilis. 
Pinnularia gibba. circus. 
interrupta. Achnanthidium lanceolatuni. 
interrupta (3. Tabellaria florealosa. 
acuminata. fenestrata. 
gracillima. Fragilaria undata. 
mesolepta. capucina. 
lata. Melosira nivalis. 
Surirella biseriata. Odontidium mesodon. 
linearis. hyemale. 
[Note. — Accompanying the above paper was a packet of 
the deposit described, kindly forwarded by the author for 
distribution among the members of the Society ; and with it 
an intimation of his readiness to aff'ord a further supply to 
any member desirous of receiving one. — Eds.] 
VOL. V, 
m 
