201 



Dublin Miceoscopical Club. 

 Octoler 2St7i, 1869. 



Dr. John Baekee showed examples of the encysted or resting 

 condition of Ceratium cormdmn, which, unUke the corresponding 

 smooth-walled state of the common species of Peridinium, has a 

 double coat — the outer smooth — the inner densely covered by short, 

 straight, blunt, projecting processes. — -He also exhibited a fine 

 specimen of the curious little infusorium lately drawn attention to 

 by him, possessing the remarkable characteristic of inhabiting a 

 hyaline barrel-shaped test, open at each extremity ; a more 

 particular account of this pretty and interesting form will hereafter 

 be given by Dr. Barker. 



Dr. Moore showed the pretty and curious aquatic cryptogamous 

 plant, Salvinia nutans, being the first time it had been exhibited in 

 a living state at any scientific meeting in Ireland. The beautifully 

 fluted sacs containing the antheridia, as well as the sporangia 

 attached to the under side of the short rhizome of the plant, were 

 ripe and in good condition for examination. The former constitute 

 a pretty object as seen under a low power, the separate antheridia 

 being globose in shape, each with a short stalk or point of attach- 

 ment, and having a cellular reticulated appearance on the surface. 

 The sporangia are much larger, pale coloured, and ovoid in form. 

 During the conversation which followed the exhibition of these 

 objects, Dr. Moore put forward a query whether the points of 

 attachment visible on the antherida could be what Schleiden may 

 have mistaken for tubes, which he states they emit and penetrate 

 into the prothallia developed from the sporangia ? In connection 

 with the foregoing, Dr. Moore showed plants of two other genera of 

 Ehizocarpods in fruit, namely, PiJularia gJohulifera, and Marsilea 

 salvatrix, Braun. The plant of the latter he stated was raised from 

 "receptacles" found in the pocket of the only survivor of that 

 calamitous exploring expedition to the interior of Australia, on which 

 our countryman, Burke, perished, after he and his companions had 

 subsisted a considerable time on the " nardoo " of the natives, which 

 consists of the "receptacles" o^ Marsilea saloatrix. 



Rev. E. O'Meara showed specimens of a diatom coming close to 

 Pleurosigma Spenceri which, however, he was disposed to identify 

 as P. WormJeyi ; he showed also Amphora turgida and A. lyrata. 



Mr. Archer exhibited specimens of a minute and curious, seemingly 

 novel, form of " trachelomonad " or " volvocine," remarkable for 

 the possession of five prominent elongate hollow cornua, being in 

 fact projections from the smooth and hyaline " lorica," four radiat- 

 ing equidistantly from the anterior portion of the organism, and 

 directed obliquely backwards, and the fifth projecting posteriorly, 

 all tapering and subacute at the apices ; the " monad " green 



