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EXPLANATION OF CONTRACTIONS AND LIST OF REFERENCES. 
Agardh, Conspect.—Conspectus Criticus Diatomacearum. 1830. 
»  Syst.—Systema Algarum. 1824. 
A. N. H., or Ann. Nat. Hist.—Annals and Magazine of Natural History. 
Bailey Mic.—Microscopical Observations in Smithsonian Contributions to Know- 
ledge. 1850. 
Berkeley.—Papers in Ann. Nat. Hist. 
Brightwell.—Papersin Quarterly Journal of Microscopical Science. 
Castracane, Catalogo, &c.—Catalogo de Diatomea raccolte nella Val Intrasca. 
Genova. 1866. 
Cleve, Om Svenska, &e.—Om Svenska och Norska Diatomacéer Ofversigt af K. 
Vetenskaps-Akad. Férhandlingar. Stockholm. 1868. 
De Brébisson, Notes on, &c.—Notes on some French Diatoms, Journal Queckett 
Club. April, 1870. 
De Brébisson, Diat. du, &e. —Diatomées marines du Litoral de Cherbourg. 
Donkin.— Papers in Quart. Jour. Micros. Science. 
Donkin, N. H. Brit. Diat.—Natural History of the British Diatomacee. 
London. Van Voorst (in course of publication). 
Kir. Abh.—Ehrenberg, Abhandlungen, Berlin Akademie. 
Ehr. Infus.— Ehrenberg, Die Infusionsthierchen. 1838. 
Ehr. Mic.—Ehrenberg, Microgeologie. 
Gregory.—Papers in Quart. Jour. Micros. Science. 
Gregory, Diat. of Clyde.—New forms of Marine Diatomacez found inthe Frith of 
Clyde. Edinburgh, 1857. 
Greville.—Papers in Quart. Jour. Micros. Science. 
Grey. Brit. Flora.—In Hooker’s British Flora (Cryptogamia). 
Grunow.—Verhand. &c., Ueber neue oder ungentigend gekannte Algen in Verhand- 
lungen der K. K. Zoologisch-botanischen, Gesellschaft in Wien. 
Grunow.—Reise 8. M. Novara um die Erde. 1868. 
Harvey, Manual.—Manual of the British Alga. London, 1841. 
Heiberg.—De Danske Diatomeer. Kjobenhavn. 1863. 
Kitton.—Papers in Science Gossip. 
Kiitz. Bac.—Kiitzing, Die Kiesselschaligen Baccillarien. 1844. 
Kutz. Sp. Alg.—Kiitzing, Species Algarum. 1849. : 
Lagerstedt, Sotv. Diat., &c.—Sétvattens-Diatomaceer fran Spetsbergen och Beeren 
Eiland. Stockholm. 1878. 
Lyngbye, Tentamen Hydrophytologie Danice. 1819. 
Pfitzer.—Ueber Bau und Entwicklung der Bacillariaceen. Bonn. 1871. 
Rab. Fl. Eur. Alg.—Rabenhorst, Flora Europea Algarum. Leipsic. 1864. 
Rab. Sussw. Diat—Rabenhorst, Die Stisswasser Diatomaceen. Leipsig. 1853. 
Ralfs.—Papers in Ann. Nat. Hist. 
Ralfs in Pritchard’s History of Infusoria. London. 1861. 
Roper.—Papers in Quart. Jour. Micros. Science. 
Schmidt, Atlas, &¢.—Atlas der Diatomaceen Kunde. Parts 1to4. 1875. 
Schmidt.—Die Diatomaceen aus den Grundproben der Nordsee fahrt. Berlin. 1875. 
Schumann, Diat.—Die Diatomeen der Hohen Tatra. Wien. 1867. 
Schumann, Die Preussische Diat.—Die Preussische Diatomeen, vide Schriften der 
Physik-Oek. Gesellschaft zu Kénigsberg. 1867. 
Thwaites.—Papers in Ann. Nat. Hist. 
W.S., B. D.—W. Smith, Synopsis of British Diatomaceer. 2Vols. 1853 and 1856. 
Wallich.—Papers in Quart. Jour. Mic. Science. 
Walker-Arnott.—Papers in Quart. Jour. Mic. Science. 
Weisse.—Papers in Bull, del’ Acad. Imp. des Sciences St. Petersbourg. Tome xii. 1867, 
R.I.A. PROC., SER. II., VOL. II., SCIENCE. 2Y 
