106 NATURAL HISTORY SOCIETY OF DUBLIN". 



on the Clare coast than it does of Gal way, though the latter is so much 

 nearer to those isles. It certainly is a remarkable circumstance that 

 such plants as the maiden hair fern, Adiantum capillus-veneris, Helian- 

 themum canum, and Ajuga pyramidalis should grow on the coast of 

 Clare, opposite the Isles of Arran, and in the Isles also, but nowhere 

 else in Ireland, with the exception of the fern, which has been seen in 

 very small quantities in one or two other places. When compiling the 

 work lately published, "Contributions to a Cybele Hibernica," Dr. 

 Moore and his colleague had always found Dr. "Wright most willing to 

 give them every assistance in his power, and his name would be found 

 quoted as an authority for several of our rarer plants. It would, how- 

 ever, have been referred to much often er had it not been that Dr. 

 Wright always preferred to see the names of younger collectors men- 

 tioned rather than his own. 



After which was read the following paper : — 



On some New Diatomaceje collected by Dr. E. Perceval Wright off 

 the large Island of Arran. By the Rev. Eugene O'Meara, A. M. 



The paper I submit to your notice is an appropriate sequel to that which 

 has been read this evening by Dr. E. Perceval Wright. It was his task 

 to record the higher plants collected by him in the Arran Islands 

 in August last ; it is mine to describe the diatomaceous forms discovered 

 by me in a marine gathering made off those islands. 



The matter supplied to me, of which only a small portion has as yet 

 been searched, was raised, as Dr. Wright informed me, from depths va- 

 rying from 5 to 10 fathoms ; and, taking into account the number and 

 variety of the species found in it, this gathering may be regarded as one 

 of the most interesting ever made — certainly the most interesting ever 

 made in Ireland. 



Some of the common marine species are met with. Eor instance : — 



Actynoptychus undulatus. Nitzschia plana. 

 Amphitetras antediluviana, var. /3. ,, sigma. 



Biddulphia aurita. Pleurosigma decorum. 

 Coscinodiscus radiatus. ,, formosum. 



,, minor. ,, quadratum. 



Campylodiscus Ralfsii. ,, strigosum. 



Eupodiscus crassus. Rhabdonema arcuatum. 



Grammatophora marina. Stauroneis pulchella. 



,, serpentina. ,, ,, var. j3. 



,, maculata. Synedra Gallionii. 



Isthmia enervis. Tryblionella marginata. 

 Navicula didyma. 



It is a remarkable fact that the above-named species are relatively 

 few, and the forms belonging to them, generally speaking, are not of 

 frequent occurrence. 



