208 Dublin Microscopical Club. 



A Phycochromaceous Al(ju endowed with Motile Powers, seemingly 

 not hitherto noticed. — Mr. Archer drew attention to what seemed yet 

 another "unicellular phycochromaceous alga" (yet the cells often 

 grouped), endowed with the power of automatic movement hither and 

 thither. This did not seem to be at all the same as Lankester's (so- 

 called) Bacterium ruhescens, in which the cells are elongate and biscuit- 

 shaped and bicoloured ; here the cells were not elongate, were often 

 bluntly angular, and when in the dividing state sometimes showed 

 Avhat might be called a " Buh-Cosmariitm-like " figure. Their action 

 during progression was, however, comparatively feeble and vacil- 

 lating, consisting of a trembling, irregularly rolling motion backwards 

 and forwards, not a straight-ahead progress even for short distances. 

 Just as in the similar cases of an active movement evinced by phy- 

 cochromaceous cells, not any visible means was evident, that is to 

 say, no cilia. However, as those skilled in the use of very high 

 powers have demonstrated flagella on Bacteria, so most probably they 

 are present in such cases as that now exhibited. 



CeU-strncture of CaUithamnion and Laurencia. — Dr. E. Perceval 

 Wright showed specimens of the cell-structure of species of Ccdlitham- 

 nion and Laurencia, exhibiting the continuation of the cell- walls from 

 cell to cell, which, in a living condition, allowed of the conti- 

 nuity of the protoplasmic contents, which he now regarded as charac- 

 teristic of the Floridese. 



November 15, 1883. 



Cosmarinm siriolatum, Niig., e.v herb, litinsch, but seemingly a 

 distinct species therefrom. — Mr. Archer showed a preparation of 

 Prof. Eeinsch's containing an example of a Cosmarium labelled by 

 him Cosmarium striolatum, Niig. This Mr. Archer thought it could 

 not be, as Niigeli describes and figures his form as granulate, 

 whereas the present noble form is quite distinctly just the reverse, 

 that is to say, covered with deep hemispherical depressions (not 

 granules) arranged in lines in such fashion that six depressions 

 occur hexagonally and equally disposed around each single depres- 

 sion, taken as an individual. Thus the form does not assume that 

 quasi-striolate appearance from which Niigeli drew his name. Prof, 

 Ueinsch's form now shown agrees no doubt fairly well in general 

 outline with Nageli's Cosm. striolatum (not yet found in this country) ; 

 but Mr. Archer thought it must really be accounted a new and 

 quite distinct species. 



Neiv Fungus from a Silo exhibited. — Mr. Pirn showed a remarkable 

 fungus from a newly-opened Silo at the Albert Institution, Glas- 

 nevin, where it tinged the affected part of the grass (ensilage) a deep 

 red colour. This presented a densely-branched septate mycelium, 

 on which were borne a large number of spherical sporangia, much 

 resembling Pythium or Saprolegnia, yet having a very different 

 aspect from those forms. The sporangia, which were sometimes 



