NOTES ON SPECIES 167 



Fragilaria antarctica f. bouvet, Karst. 

 Karsten, 1905, p. 123, pi. xvii, fig. 10. 



More localized than the last named but generally even more abundant when present, 

 and showing an even closer relation to pack-ice. Abundant along with the type-form in 

 the areas indicated above. 



Genus Synedra, Ehrenberg, 1830 

 Synedra spathulata, Schimp. 



Karsten, 1905, p. 124, pi. xvii, fig. 11. 



Widely distributed but never common in this material. Present in moderate numbers 

 at several stations in the Bellingshausen Sea, especially in 1929-30, more rarely in the 

 Scotia Sea and southern Weddell Sea. 



Genus Thalassiothrix, Cleve and Grun, 1880 

 Thalassiothrix antarctica, Schimp. 

 Karsten, 1905, p. 124, pi. xvii, fig. 12. 



Abundant to the south-west of the Bellingshausen Sea, 1 930-1, where bundles of four 

 and eight frustules were common. These rafts of frustules attached at similar poles were 

 first observed by Schimper. Moderately frequent in older water farther north, but not 

 observed far south in the Weddell Sea. Moderately abundant on both surveys round 

 South Georgia, in spring mainly to the west, and in the later survey of the abnormally 

 warm season 1929-30, to the east. On this occasion the frustules were of uniformly 

 small size and occurred only singly or in pairs, 



Thalassiothrix spp. 



A few individuals, mostly bearing a strong resemblance to Th. lojtgissimo, Cleve and 

 Grun., were encountered at one or two stations round South Georgia and in Bransfield 

 Strait. 



Family TABELLARIACEAE, West, 1927 



Genus Lycmophora, Agardh, 1832 

 Lycmophora lyngbyei (Kutz.), Grun. 

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



This littoral form grows abundantly on the kelp round South Georgia and on the 

 Coromda shells on Humpback whales. It is also occasionally found in the inshore 

 plankton and in the film of Cocconeis ceticola, Nelson, on the skins of the southern 

 rorquals. 



Lycmophora sp. 



A large and probably distinct species was observed in the plankton at a few inshore 

 stations in Bransfield Strait and the Bellingshausen Sea. This may prove to be 

 L. reichardtii, recorded (but not figured) by Mangin from the same region. 



