214 PROCEEDINGS OF SOCIETIES. 



he had never before found in Ireland, and had, indeed, only once 

 before seen it from near Ambleside, in Westmoreland ; the latter 

 he had taken only once before in Ireland (Connemara). As 

 previously mentioned, Micrasterias furcata (the handsomest 

 British form !) was to his eyes quite a distinct thing from M. crux- 

 melUensis, though, ere he had seen an indubitable example of M. 

 furcata, he had conjectured they might possibly be one and the 

 same. — Micrasterias radiosa he had taken previously in Wales, but 

 only in Half's single locality for it, Llyn Grvvernan, near Dolgelly, 

 and once before in Ireland, (Connemara) ; Irish specimens did not 

 seem quite so large as the Welsh. 



Staurastrum arctiscon (Ehr.),Lund.,weii»^o Ireland. — Mr. Archer 

 likewise showed, new to Ireland, from Connemara, that very fine 

 form Staurastrum arctiscon (Ehr.), Lundell ; of this, indeed, he had 

 found only three or four examples, though he had most patiently 

 gone over the material in the hope of increasing the number, and it 

 is so large and striking a form it could hardly escape observation 

 in an ordinary field of view, even under the lowest powers. It is 

 quite distinct from Staurastrum sexangulare, Bulnh., upon taking 

 which species for the first time Mr. Archer had thought to be St. 

 arctiscon possibly. 



Docidium coronatum, Ehr., exhibited. — Mr. Archer also showed 

 the, with us, rare Docidium coronatum (Ehr.), a fine species, not 

 unlikely, however, to be overlooked for Docidium nodulosum. 



Seterophrys Fockii, Archer, exhibited in groups. — Mr. Archer 

 showed a very fine collection, presenting many groups conjoined, 

 sometimes as many as a dozen or so of individuals of Seterophrys 

 Fockii ; this rhizopod, when nicely illuminated, forming then a pretty 

 and cui'ious-looking object, calling to mind Haeckel's figure of 

 Myxodictyum sociale, but it need not be said a whoU}'- different 

 tiling. The«e examples showed the pseudopodia extended to a very 

 great length ; longer, in fact, than he had ever before seen, say three 

 or four times the body-diameter. 



Form of Navicula lyra (^possibly a distinct species ?) — 

 Rev. E. O'Meara showed a form of Navicula lyra, Ehr., from 

 stomachs of Ascidians (Roundstone Bay, Co. Galway), which in all 

 its details coincided with the form described by Grunow, * Ueber 

 neue oder ungeniigend gekannte Algen,' p. 532, t. iii, f. 22. The 

 striation is minuteh' but distinctl}^ punctate and quite unlike that of 

 the well-known forms of Navicula lyra. On this ground he con- 

 sidered it as a well-marked variety thereof, but not entitled to be 

 considered as a distinct species. 



l%th December, 1873. 



Glosterium linea, Perty, exhibited. — Mr. Crowe showed Closterium 

 linea, Perty, from the little Stephajwsph<era-pool on Bray-head, 

 the first time that that species had been met with in that restricted 

 site. 



A Form of Navicula didyma, W. Sm. {^possibly a distinct species?), 

 exhibited. — Rev. E. O'Meara showed a form he considered identical 



