FROM THE HIMALAYAS. U 231 
CoNFERVACES. 
CoNFERVA GLACIALIS, Awetz. This seems identical with the 
species found in glacial waters at Rosenlaui, Téte noire, &c. 
CEDOGONIACES. 
Mr. Roy observed a peculiar dogonium with pear-shaped 
oogonia. 
ZYGNEMACEX. 
ZXGNEMA SUBTILE, Kuetz.? Irecord this with some doubt. In 
Rabenhorst's opinion it is a variety of Z. Vaucherit, a species 
widely diffused in Europe. 
SCYTONEMACEE. 
SCYTONEMA CASTANEUM, Kuetz. Considered by some to be a 
variety of Scytonema fasciculatum, found in mountainous parts 
of Europe. 
DESMIDIACEZ. 
Mr. Roy reported as follows : —“ Altogether 13 species were ob- 
served, of which 7 appear to be new; the others are:-— Hyalotheca 
dissiliens, W . Sm., var. tridentula, Cosmarium Brebissonii, Menegh., 
C. pachydermum, Lundell, Tetmemorus granulatus, Breb., Penium 
digitus, Ehrenb., Cylindrocystis Brebissonii, Menegh.; some refer 
this last to the genus Peniwm. These are all well-known European 
species. The new forms, not yet named, are four species of Cos- 
martum and three of Staurastrum." 
DIATOMACEZ. 
1. Eunotia monodon, Ehrenb. | 15. S. gracilis, Ehrenb. 
2. E. diodon, Ehrenb. | 16. S. platystoma, Kuetz. 
3. Cymbella amphicephala, Nig. | 17. Synedra oxyrhynchus, Kuetz. 
4. C. pisciculus, Greg. | 18. S. lunaris, Ehrenb. 
5. C. Cessatii, Grunow. | 19. Gomphonema tenellum, W. Sm. 
6. Surirella linearis, W. Sm. 20. Himantidium majus, W. Sm. 
7. S. biseriata, Breb. | 21. H. arcus, W. Sm. 
8. Navicula gracillima, Pritch. 22. Odontidium mesodon, W. Sm. 
9. N. borealis, Ehrenb. 23. O. biemale, Kuetz. 
10. N. subcapitata, a 24. Denticula tenuis, Kuetz. 
11. N. eryptocephala, Kuetz. 25. Diatoma elongatum, Ag. 
12. N. bisuleata, Laednt. 26. Tabellaria flocculosa, A'uetz. 
13, N. firma, Kuetz. 27. Melosira nivalis, W. Sm. 
14. Stauroneis anceps, Ehrenb. 28. Orthosira orichalcea, W. Sm. 
