31] 
PROCEEDINGS OF SOCIETIES. 
Dustin Microscoricat Cuvups. 
26th January, 1871. 
Dr. Joun Barxer explained the principle, by the aid of dia- 
grams, of the “ Aplanatic searcher’? proposed by Dr. Royston- 
Pigott, and expressed his view that the researches of that gentle- 
man would hereafter be found to open up the way to very 
extended and improved means of investigation being placed at 
the command of microscopists. 
Dr. Frazer exhibited specimens of Topaz. showing crystalline 
cavities containing a fluid of a different nature, also gaseous 
matters. / 
Dr. Macalister exhibited prepared examples of the new louse 
parasitic on the flamingo, and named by him Lipewrus Phoeni- 
copteri, description and figure of which are given in the ‘ Quart. 
Journal of Micr. Science,’ vol. xi, n.s., p. 163. 
Dr. Moore showed a preparation by Mr. Keit of the statoblasts 
of a Plumatella from the tank in the Botanic Garden, forming a 
pretty moderate-power object. 
Rev. M. H. Close showed Gundlach’s new so-called “ 1-24th” 
objective, bringing it to bear upon some difficult diatoms, which 
performed very satisfactorily. 
Rey. E. O’Meara exhibited some forms of Polycystina obtained 
from soundings made by Capt. Chimmo, R.N., H.M.S. “ Nassau,” 
16th July, 1870, in the Indian Ocean, lat. 3° 23’ N., long. 
84° 44/ E; also slides containing some forms of Synedra new to 
Ireland, perhaps to Great Britain ; Synedra debilis, Kiitz., from a 
gathering, River Dour, Co. Cork, in the herbarium of Trin. Coll., 
Dublin; Synedra gracilis, Kiitz., very different from that of Wm. 
Smith so-named, occurring on sea-weeds collected at Salt Hill, and 
mixed with the variety S. barbatula, Kitz. and Grunow; Synedra 
parva, Kiitz., occurring with tolerable frequency in the same 
gathering ; Synedra Nitzschioides, Grunow, ‘ Verhand. der k. k. 
Zool. bot. Gesells.,’ xii Band, 1862, p. 403; found by that author 
in the Pacific Ocean, and occurring occasionally among other 
forms in the stomachs of Ascidians, collected in Roundstone Bay 
by A. G. More, Esq. 
Mr. Archer had been lately considerably struck by certain 
cases of the phenomenon of locomotion without visible motory 
organs, as evinced by some minute organisms, one of which, at 
VOL. XI.—NEW SER. x 
