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 A HISTORY OF CORNWALL NITZSCHIACE^ (continued) Nitzschia palea, W. Sm. W.C. plana, W. Sm. - rostrata, Grun. - Sigma, W. Sm. var. curvula, Brun. - Smithii, Ralfs. spathulata, Bre'b. vivax, W. Sm. Hantzschia amphioxys, Grun. W.C. virgata, Grun. Padstow - marina, Grun. SURIRELLACE.S: Suriraya biseriata, Bre'b. W.C. elegans, Ehr. - fastuosa, Ehr. var. lata, V.H. gemma, Ehr. linearis, W. Sm. Moelleriana, Grun. Sennen ovalis, Bre'b. W.C. var. angusta, V.H. var. Crumena, V.H. var. minuta, V.H. var. ovata, V.H. var. pinnata, V.H. var. salina, V.H. robusta, Ehr. Smithii, Ralfs. spiralis, Ktltz. splendida, Kutz. Cymatopleura solea, W. Sm. Campylodiscus parvulus, W. Sm. Ralfsii, W. Sm. var. pinnatus, Perag. Thuretii, Bre'b. DlATOMACE^: Diatoma elongatum, C. Ag. var. tenue, C. Ag. hiemale, Heib. var. mesodon, Grun. obtusum, Kirchn. Odontidium marinum, Grun. Penzance MERIDIONACE^E Meridion constrictum, Ralfs. W.C. FRAGILARIACE.S Synedra affinis, Ktltz. var. tabulata, V.H. Gallionii, Ktttz. pulchella, Ktltz. Penzance Ulna, Ehr. W.C. var. splendens, Brun. Vaucherias, Kutz. Ardissonia crystallina, Grun. superba, Grun. Toxarium Hennedyanum, Grun. undulatum, Bail. Fragilaria capucina, Desmaz. hyalina, Grun. var. minima, De Toni.

FRAGILARIACEJE (continued) Fragilaria virescens, Ralfs. W.C. Grammonema striatulum, C. Ag. Rhaphoneis amphiceros, Ehr. Dimerogramma fulvum, Ralfs. Padstow LlCMOPHORACEJE Licmophora flabellata, C. Ag. W.C. Lyngbyei, Grun. ovata, Grun. paradoxa, C. Ag. Penzance STRIATELLACEjE Tabellaria fenestrata, Ktltz. W.C. flocculosa, Ktltz. Grammatophora angulosa, Ehr. var. hamulifera, Grun. marina, Lyngb. oceanica, Ehr. var. macilenta, Grun. serpentina, Ralfs. Rhabdonema Adriaticum, Ktltz. arcuatum, Ktltz. minutum, Ktltz. Striatella unipunctata, C. Ag. EUNOTIACE^: Cystopleura argus, Kunze. var. longicornis, Grun. gibberula, Kunze. var. rupestris, Grun. ocellata, Brb. turgida, Kunze. var. Westermannii, Grun. Eunotia alpina, Kutz. arcus, Ehr. diodon, Ehr. gracilis, Rabenh. major, Rabenh. pectinalis, Rabenh. robusta, Ralfs. Soleirolii, Rabenh. tetraodon, Ehr. Pseudoeunotia biceps, Grun. flexuosa, Grun. lunaris, Grun. var. bilunaris, Grun. RmzosoLENiACACffi Rhizosolenia styliformis, Brightw. W.C. ISTHMIACE^ Isthmiella enervis, Cleve. BlDDULPHIACE.ffi Biddulphia pulchella, Gray. Denticella Mobiliensis, Grun. Amphitetras alternans, Bre'b. antediluviana, Ehr. Triceratium pileus, Ehr. CH ;ETOCER ACEJE Chaetoceros armatus, West. confervoides, Ralfs. didymus, Ehr. incurvus, Bail. Syndendrium Diadema, Ehr. 94