1887-1888.] 



63 



Colin Mountain, which contained 44 species, and was remark- 

 ably like the Loughmourne deposit in many respects. 



The following is a list of species from Loughmourne : — 



Surirella biseriata Stauroneis anceps 



,, linearis ,, Fhocniceuteron 



,, nobilis Navicula (?) bacillans 



,, splendida 



, , turgida 



Campylodiscus costatus 

 Cocconema cistula 



,, cymbiforme 



, , lanceolata 



Cymatopleura elliptica 



, , solea 



Cymbella cuspidata 



,, Ehrenbergii 

 Amphora oralis 

 Cyclotella operculata 

 Epithemia alpestris 



,, aigus 



,, gibba 



,, granulata 



,, Hyndmanii 



,, turgida 



,, zebra 

 Pleurosigma attenuatum 



,, Spencerii 



,, elliptica 



,, firma 



,, gibberula 



,, pusilla 



Pinnularia gibba 



, , interrupta 



,, major 



,, (?) nodosa 



,, staurceniformis 



, , tabellaria 



, , viridis 



, , radiosa 

 Cocconeis placentula 

 Gomphonema acuminatum 

 Himantidium gracile 

 Odontidium (?) 



, , Harrisonii 



Orthosira arenaria 



,, orchilacea 

 Nitzschia (?) palea 



Mr. Swanston followed by reading the original record of the 

 discovery of Diatomaceous earth in the Mourne Mountains, as 

 published in the Magazine of Natural History, Vol. III., new 

 series, 1839, p. 353. The article was contributed by James L. 

 Drummond, M.D., Professor of Anatomy in the Royal Belfast 

 Institution, and President of the Belfast Natural History 

 Society. From it we learn that Wm. Thompson, Esq., when 

 residing at Newcastle, Co. Down, sent the author specimens of 

 a light, white, earthy substance, which had been found in the 

 neighbourhood, and which proved to be rich in diatoms — in 

 fact, a deposit of fossil diatomaceae. Other specimens were 

 obtained from Dr. Hunter, of Bryansford (near Newcastle), 

 which proved on examination to be similar. Dr. Hunter's 



