Griffiths.—On Glancocystis Nostochinearum , Itzigsohn. 431 
which separate Glancocystis from all the rest of the Cyanophjrceae, and 
probably justify it being placed in an entirely separate group of that 
division. 
Botanical Laboratory, 
University of Belfast, 
December , 1914. 
Literature. 
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-(’ 01 ): Report to Brit. Assoc., 1901 (1902). 
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DESCRIPTION OF PLATE XIX. 
Illustrating Mr. Griffiths’s paper on Glancocystis Nostochinearum, Itzigsohn. 
All drawings (except Fig. 12) were made with a Zeiss Abbe camera-lucida on a Zeiss micro¬ 
scope with achromatic objectives and compensated oculars. For finest details an oil-immersion 
objective was used. Diffuse staining is indicated by fine dots. The cell-wall is not shown in 
many cases. 
Fig. 1. Glancocystis Nostochinearum in resting condition, x 857. k ., karyoplasmic area; 
m., cytoplasm full of metachromatin granules. 
Fig. 2. Cell with karyoplasmic area in centre, x 857. e., equatorial thickening; p ., polar 
thickening; other letters as before. 
Fig. 3. Cell with definite nucleus, x 857. 
Fig. 4. Cell with definite nucleus, x 857. l.k large karyosome of chromatin. 
Fig. 5. Cell with elongated nucleus. x 857. 
Fig. 6. Cell with nucleus in process of division by transverse fission, x 837. The large 
karyosome has already divided. 
