SYSTEMATIC ACCOUNT 337 



countries and in the North Atlantic Ocean. It was observed, sometimes in considerable 

 numbers, around South Africa and in the Peru Current material from the Pacific. 

 Observed at Sts. 425, 427, 428, 431, 433, 434, 435, 440, 1373 ; WS 580, 709, 710, 713. 



Genus Licmophora Agardh 

 Agardh, 1827 



Licmophora luxuriosa Heiden et Kolbe. 

 Heiden et Kolbe, 1928, p. 572, pi. 6, figs. 140, 141. 



Cells rather large. Valve clavate, apices rounded. The apex at the broad end of the 

 valve not bluntly rounded, but very slightly attenuate. The greatest diameter of the 

 valve is at about one-fifth of the valvar distance from the broad end, after which the 

 valve tapers very gently towards the narrow apex. The valve bears a median pseudo- 

 raphe and numerous transverse coarse striae. In girdle view the cell is broadly cuneate 

 with a complex connective zone, showing the characteristic septa. Between the septum 

 and the valve margin is a long and narrow cuneate area, which is minutely punctate. 

 These small puncta are arranged in transverse lines. Chromatophores : several rounded 

 bodies. Apical axis of cell, 110-210/ti, greatest transapical axis 18-26^. Type locality, 

 Observatory Bay, Kerguelen. 



A stipitate epiphytic diatom characteristic of the Southern Ocean. A few isolated 

 specimens were observed in the South Atlantic, St. 670, but it occurred in considerable 

 numbers in the Bransfield Strait. 



Observed at Sts. 670; WS 481. 



Licmophora Lyngbyei (Kutzing) Grunow ex Van Heurck. 



Van Heurck, 1880-5, P- l 5%> P^ 4°> %• I - 



Lebour, 1930, p. 203, fig. 165. 



Podosplienia Lyngbyei Kutzing, 1844, p. 121. 



Cells colonial, united by means of mucous stipes to form dense tufts. Cells in valve 

 view clavate, the broad end rounded ; in girdle view, broadly cuneate somewhat tri- 

 angular. Valve flat, furnished with fine transverse striae and a prominent pseudo- 

 raphe. Connective zone cuneate, showing numerous septa. Chromatophores : numerous 

 cocciform bodies. Apical axis of cell 54-80/Lt. 



This organism is widespread in both the northern and southern hemispheres ; in the 

 latter it is very abundant. No appreciable difference was observed between the forms 

 so widely separated. A very common littoral diatom often epiphytic upon kelp and 

 frequently observed epizootic upon the legs of small crustaceans. 



Research into the nomenclature of this species reveals an interesting history. The 

 organism has been referred to many earlier names, the earliest being Echinella cuneata 

 Lyngbye (18 19), but lack of precision in the description and the crudity of the illustration 

 make it impossible to say with any degree of certainty that the organism here referred 

 to is synonymous with Lyngbye's species. If we find we are unable to accept Echinella 

 cuneata Lyngbye, we cannot recognize any subsequent name which is based wholly on 



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