go Calcareous Pebbles formed by Alga. 



Navicula Rcinhardtii, Grun. Rare. 

 vulpina, K. 

 Zellensis, Grun. Frequent. 

 Nitzschia amphibia, Grun. 

 angustata, Grun. 



var. acuta, Grun. 



Denticula, Grun. 

 sinuata, var. Tabellaria, Grun. 

 Pinnularia major, K. 



microstauron, E. 



Krookii, Grun. Abundant (teste Cleve). 

 oblonga, K. 



viridis var. commutata, Grun. 

 Pleurosigma attenuatum, W. S. Rare. 

 Stauronis Phcenicenteron, E. 



anceps, var. amphicephala, K. Rare. 

 Stephanodiscus Astraea var. spinulosa, Grun. 

 minutula, Grun. 



Synedra Chasei, Walker. 

 delicatissima, W. S. 

 obtusa, W. S. 

 Tabellaria fenestrata, K. 



E. GROVE. 



DIATOMACEOUS REMAINS OBSERVED IN WASHINGS OF 



CALCAREOUS ALG^E FROM LOUGH BELVIDERE, 



MULLINGAR, IRELAND. 



Achnanthes Biasolettiana, Grun. 



Clevei, Grun. Rare (teste Cleve). 



delicatula, Grun. Rare. 



lanceolata, Grun. Scarce. 



,, microcephala, Grun. 



minutissima, K. 



var. cryptocephala, Grun. 



Achnanthidium flexellum, Breb. 



