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II . — On some New Genera and Species of Biatomacem. 
By M. P. Petit. Translated by F. Kitten, Hon. F.E.M.S., by the 
kind permission of the Author. 
{Taken as read before the Royal Microscopical Society, June 5, 1878.) 
Plates XIV. and XV. 
In the ‘Fond de la Mer’ M. P. Petit has given a list of Dia- 
tomacese collected by the expedition sent by the French Govern- 
ment to Campbell Island,* in the year 1874, for the purpose of 
observing the transit of Venus. Dr. Filhol, one of the gentlemen 
appointed by the Government, after leaving the expedition, travelled 
alone in New Zealand, and the forms obtained by him are also in- 
cluded in M. Petit’s list. 
DESCRIPTION OF THE PLATES. 
Plate XIV. 
Fig. 1. — Cocconeis notata (P. Petit), n. sp. 
„ 2. — „ australis (P. Petit), n. sp. ; a, frustule ; 6, inferior valve ; 
c, superior do. 
„ 3. — Cocconeis Wrightn new form. 
„ 4. — „ Crux (Ehr.). 
„ 5. — Campyloneis Grevillii (Grun.) ; a, frustule ; 6, one of the plates of the 
inferior valve ; c, second plate of do. ; d, superior valve. 
„ 6. — RhapJioneis fasciolata (Greg.), n. var. 
„ 7. — Hyalodiscus maximus (P. Petit), n. sp. x 200 diameters ; a, valve ; 6, f. v. 
of do. 
„ 8. — Amphora cristata (P. Petit), n. sp. 
„ 9. — „ aspera (P. Petit), n. sp. 
„ 10. — Epithemia (?) monilifera (P. Petit), n. sp. 
„ 11. — Navicula decussata? (Ehr.), (Kg.). 
„ 12. — „ Rhombus (P. Petit), n. sp. 
„ 13. — „ Hennedyi (Wm. Sm.), n. tar. 
„ 14. — „ Smithii (Breb.), ^ minor (P. Petit). 
„ 15. — „ biseriata (P. Petit), n. sp. 
Plate XV. 
„ 16. — Stauroneis robusta (P. Petit), n. sp. ; a, valve ; 6, frustule. 
„ 17. — Amphiprora ruyosa (P. Petit), n. sp. 
„ 18. — Surirella Filholii (P. Petit), n. sp. 
„ 19. — Trachysphenia australis (P. Petit), n. gen. and sp. 
„ 20. — Grammatophora marina (Kg.), n. var. 
„ 21. — „ longissima (P. Petit), n. sp. 
„ 22. — Rhabdonema hamuliferum (Kitton), n. sp. 
„ 23. — Navicula Campbellii (P. Petit), n. sp. 
„ 24. — „ quxrnerensis (Grun.), var. dilatata (P. Petit). 
,, 25. — Auliscus stelliger (P. Petit), w. sp. 
All the figures, excepting Fig. 7, are x 600 diameters. 
* Campbell Island is in the South Pacific; lat. 52° 33' S., long. 169° 8' E. 
(London). It is of volcanic origin, 36 miles in circumference, and 1500 feet 
above the sea-level. 
