378 NOTES OF ALGÆ. 
diffusion of Diatomaceæ is well known: I have found them 
very abundant in the excrement of the fresh water mussel, 
(Mya margaritifera, Linn. Some Infusoria seem to feed 
upon the smaller species: I have seen Navicule on the out- 
side of and mixed up with the so-called stomachs in what 
were supposed to be Leucophrys patula and Bursaria vorti- 
cella of Ehrenberg: the siliceous loricæ are rejected after the 
digestion of their contents. The smaller species of Clos- 
terium, &c., often share the same fate. I have also seen 
Navicule and other forms of Diatomaceæ in what was sup- 
posed to be the stomach of a parasite (probably a Cercaria) 
which infests Limneus pereger. In the fine mud deposited 
from the sea foam, at and above high water mark, after 
storms, I have found a mixture of fresh and salt water 
forms. ao 
I, Pannanich cliffs, at about 1100 feet. 
se eiie protuberans, Hematococcus murorum, Litho- 
nema crustaceum, Lyngbya punctalis, Oscillatoria ru- — 
pestris?, Scythymenia rupestris ?, Stigonema atrovirens, 
Diatoma flocculosum. 
II, Craigendarroch, about 1300 feet. 
Conferva ericetorum, Hassallia ocellata, Taitaa lina 
- Tetraspora /ubrica, Tolypothrix distorta. | 
n. Khoil, at 1600 feet. ! 
... Draparnaldia glomerata, Hæmatococcus binalis, Nostoc - 
: mune, Ne sphæricum, Oscillatoria f E 
. ovalis, Cymbella helvetica, Epithemia alpestris, Eunotis 2 
i diodon, E. monodon, Surirella biseriata. E 
xt IV. Lochnagar, at 2000 feet. je 
| Hassallia ocellata, Hæmatococcus binalis, Lyngbya 0 nala. 
w. Lake of Lochnagar, 2563 bet. = xw 
Bulbochæte setigera, Hassallia ocellata, Tolypothrix distorta À 
