56 F. E. FRITSCH. 



PLATE II. 



FIGS. 74-78. Lyiigbya lagerheimi (Mob.) Gomont ; 74, 75, typical portions of the stratum ; 76, 77, two 



filaments from the stratum, showing spiral coiling ; 78, a single filament on a larger scale 



with the contained trichome. (74-77, X 500 ; 78, X 1200.) 

 FIGS. 79-84. Lynglya attenuata sp. u. ; 79-83, different types of apex of the trichorncs ; 84, a filament. 



(X 800.) 

 FIGS. 85-80. Lyngbya ceriigMeo-carulea (Kutz.) Gom. ; 85, 85ff, normal filament ( x 700) ; 80, filament 



with gonidia ( X 800). 

 FIGS. H7-90. Lyivjbya astuarii (Mertens) Liebm., var. antarctica var. nov. &e p. 27. (87, X 800 ; 



88-90, X 700.) 



FIGS. 91-'.)3.Lynglya scotli sp. n. (91, 92, X 700 ; 93, X 1200.) 

 FIGS. 94-96. var. minor var. nov. (x 1350.) 



FIGS. 97-98. Navicula seminulttm Grun. (x 1250.) 

 FIGS. 99-100. stauropteroides sp. n. (99, X 1800 ; 100, X 1250.) 

 FIGS. 101. njmatupleurus W. and G. S. West, (x 1250.) 



FIGS. 102-103. Mkrocystis chroococcoidea W. and G. S. West, (x 800.) 



FIGS. 104-108. Nodularia spumigena Mertens, var. minor nov. var. (104-106, x 800; 107-lo<s, x 1:>00.) 

 FIGS. 109-115. Nodularia quadra/a sp. n. 112-114 show different types of apices ; 115 shows filament 



with a probably immature spore. ( X 800.) 

 FIGS. 110-117. Dactylococcopsis rhaphulioides Hansg. The group in fig. 116 shows a distinct septum in 



several of the cells. ( x 800.) 

 FIGS. 118-120. AnabcRna antarctica sp. n, filaments with spores; the smaller spores in fig. 118 are 



probably immature. ( x 500.) 

 FIGS. 121-122. Dactylococcopsis antarctica sp. n. ; 121, small part of the colony ; 122, a cell in process of 



division, (x 1350.) 



