3. Achnanthes turgens, Ehrb. I. c.
Hab. Graham's Land; in mud from 270 fathoms.
15. LICHNOPHORA, Ag.
1. Lichnophoka abbreviata, Ag. Podosfenia abbreviata, Ehrb. hi fas. p. 24. t. 18. f. 7.
Hab. Kerguelen's Land ; in the sea.
Frustula omnino ut iu exemplaribus ab Ehrenberg depictis, seel plura, stipiteque majore. TAwaites, MS. Occurs as a parasite on Ceramium rubrum, in the Mediterranean Sea.
16. DIATOMA, Ag.
1. Diatoma, n. sp. ? frustulis angustissimis omnino aut fere lfevissimis e dorso visis versus apices truncates sub-dilatatis, e latere visis infra apices rotundatos constrictis.
Hab. Falkland Islands ; on marine Conferva.
D. elongata, Ag. siraillima, differt frustulis nunquam aut vix striatis. Thwaites, MS.
17. COCCONEJPl, Ehri.
1. Cocconema Lunula, Ehrb. Cymbella maculata, Kiitz. p. 79. t. 29. f. 32. c.
Hab. Falkland Islands; on marine Conferva, Lesson. In a white pigment used by the Fuegians, C. Darwin, Esq.
Found throughout Europe, in Mexico and Chili, the /Egean Sea, the Oregon River, and in earth from Labrador. It also occurs in the white pigment used by the natives of Fuegia, and in atmospheric dust at the Cape de Verd Islands.
18. GOMPHONEMA, Ag.
1. Gomphonema clavatum, Ehrb.; Infus. t. 18. f. vi.
Hab. Falkland Islands; on marine Conferva,, Lesson.
Throughout the European and North American shores, those of Iceland, the Marian and Sandwich Islands. Fossil in Virginia, U.S.
2. Gomphonema minutissimum, Grev. in Hook. Brit. Ft. vol. ii. p. 209. G. curvatum, p. saliuum, Kiltz. p. 85. t. S. f. 1.
Hab. Falkland Islands ; on marine Conferva ; Lesson.
A British and common Atlantic species ; found also in the Oregon territory and fossil in Virginia, U. S.
19. PINNULARIA, Ehrb.
1. Pinnularia borealis, Ehrb.
Hab. Cockburn Island ; in the soil of a Penguin rookery. In a pigment used by the Fuegians; C. Darwin, Esq.
Found also in Peruvian guano, in the Mastodon earth of the Plate river, and in the Cape de Verd atmospheric dust. Also in volcanic ashes from Ascension Island and Patagonia; in volcanic tuff of the Rhine and Phonolite stone.
