1907- Notes. 37 r 



Melampus bidentatus in Co. Cork — a Correction. 



In our Cork list of Mollusca, ante, p. 282, A. W. Stelfox and I give the 

 above as a species common at Rostellan. This is incorrect ; the species 

 we collected there is Alexia denticulata, var. myosotis. Many errors of de- 

 termination seem to have been made in these two species in the past ; 

 the latter is larger and darker in colour, and is evidently more abundant 

 in Ireland, 



R. Welch. 



Belfast. 



GEOLOGY. 



Curious boulder at Narin. 



While in West Donegal in September I noticed a large boulder on the 

 shore below Narin, which seemed to consist of a core of diorite, with an 

 outer covering of grey granite. The boulder was oval in shape, about 

 26 inches in longer diameter, with a patch of the outer layer broken awaj*, 

 revealing the darker rock inside. The granite covering was about one 

 inch thick. Prof. Cole tells me there is granite intruding into diorite 

 near Portnoo, the little port at Narin, but the boulder formation is not 

 explained by that. 



R. WELCH. 



Belfast. 



IRISH SOCIETIES. 



DUBLIN MICROSCOPICAL CLUB. 



October 9. — The Club met at Leinster House. Prof. G. H. Carpenter 

 (President) showed specimens of a springtail, Isotoma tenella, Reuter, 

 found in the spring of 1907 in large numbers feeding on leaves of 

 tobacco seedlings grown at Kilkenny. The species, first discovered in 

 Finland and subsequently noticed in Germany, is new to the Britannic 

 fauna. 



W. F. Gunn showed a fungus, Botrytis parasitica, Cav., which is very 

 destructive to Tulips when they are grown in large quantities. A portion 

 of a leaf was shown covered with the olive-brown aerial hyphae bearing 

 umbellate clusters of conidia. On a separate slide the sclerotia form of 

 fruit was shown. According to Massee, this fungus is morphologically in- 

 distinguishable from Botrytis gaianthina, which attacks the Snowdrop, 

 but differs from it physiologically, and he suggests that both these species 

 " will eventually prove to be nothing more than physiologically differen- 

 tiated from Botrytis cinerea, Pers." 



Dr. G. H. Pethybridge again exhibited "fruiting" specimens of 

 potato blight {Phytophthora infestans) growing on the supposedly immune 

 or resistant Solatium Cotnmersonii Violet. Earlier in the year it was shown 

 that this fungus would grow well when inoculated on the cut tubers of 

 this variety. In the present instance it was growing profusely on the 



