SYSTEMATIC ACCOUNT 353 



Genus Chuniella Karsten 

 Karsten, 1905 



Chuniella oceanica (Karsten) Hendey, comb. nov. 

 Navicula oceanica Karsten, 1905, p. 126, pi. 18, fig. 4. 



Cells large, usually solitary. Valves somewhat broadly lanceolate in outline with sub- 

 acute apices. Raphe rather prominent, eccentric, depressed slightly in the middle of 

 the valve. Connective zone simple. Chromatophores : numerous cocciform bodies, 

 conglomerated near the middle of the cell. Apical axis of cell 240/x ; transapical axis 30/1. 



Several isolated specimens which corresponded with Karsten's illustration and de- 

 scription were observed around South Georgia. The cells were weakly siliceous and did 

 not occur in sufficient numbers to allow careful examination to be made, but an ex- 

 amination of the small number available showed quite clearly that this form did not 

 belong to the genus Navicula. I have placed it in the genus Chuniella of Karsten, a 

 genus which is intermediate between Navicula and Nitzschia, because of the eccen- 

 tricity of the raphe, the simplicity of the connective zone, and because it approximates 

 in general appearance to the type of that rather ill-defined genus. 



Observed at Sts. 384, 475, 478, 481, 505, 1356, 1358. 



REFERENCES 



Agardh, C. A., 1824. Systema Algarum. 



1827. Aufzdhlung einiger in den bsterreichischen Landern gefundenen neuen Gattungen und Arten von Algen, 



nebst Hirer Diagnostik und beigefiigten Bemerkungen. Flora oder Botanische Zeitung, x, pp. 625-46. 



1830-32. Conspectus criticus Diatomacearum. 



Atkins, W. R. G., 1922 a. The preparation of permanently non-acid formalin for preserving calcareous 



specimens. J. Marine Biol. Ass. (n.s.) XII, p. 792. 

 1922 b. The hydrogen-ion concentration of the cells of some marine Algae. J. Marine Biol. Ass. (n.s.), 



XII, p. 785. 

 1922 c. The influence upon algal cells of an alteration in the hydrogen-ion concentration of sea water. 



J. Marine Biol. Ass. (n.s.) XII, p. 789. 

 Bailey, J. W., 1842. A sketch of the infusoria of the family Bacillaria, etc. Amer. J. Sci. Arts, xlii, 



pp. 88-105. 

 - 1850 (185 1). Microscopical observations made in South Carolina, Georgia and Florida. Smith. Contrib. 



Knowl., 11, art. 8. 



1855. Notes on new species and localities of microscopic organisms. Smith. Contrib. Knowl., vn, pp. 1-16. 



Bailey, L. W., 1862. New species of microscopical organisms chiefly from the River Para. Proc. Bost. Soc. 



Nat. Hist., viii, pp. 162-69. 

 Barnes, H. T., 1932. The physiological effect of Trihydrol in water. Proc. Nat. Acad. Sci. U.S.A., xvm, 



No. 1, pp. 136-7. 

 Bennett, A. G., 1920. Occurrence of Diatoms on the skin of whales. Proc. Roy. Soc. Ser. B, XC1. 

 Bergon, P., 1902 a. Note sur un mode de sporulation observe chez le Biddulphia mobiliensis Bailey. Bull. 



Stat. Biol. Soc. Sci. d'Arcachon, VI, pp. 127-36. 

 1902 b. Etudes sur laflore diatomique du Bassin d'Arcachon et des parages de VAtlantique voisins de cette 



station. Bull. Stat. Biol. Soc. Sci. d'Arcachon, III, pp. 39-112. 



1903. Nouvelles recherches sur un mode de sporulation observe 1 chez le Biddulphia mobiliensis Bailey. 



Bull. Stat. Biol. Soc. Sci. d'Arcachon, vi, pp. 163-76. 



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