ZOOLOGICAL AND BOTANICAL ASSOCIATION. 123 



Cosmarium llalfsii (Brib.), not uncommon. 



„ tinctum (Balfs), rare. 



Staurastrum O'Mearii (miht), rare. 

 „ brevispina (Brib.), rare. 



,, monticulosum (Brib.), rare. 



[Of this rare and pretty species, I have found a quad- 

 rangular variety (Plate XI., Fig. 16, exhibits an end view), 

 as well as the triangular form recorded in Ralfs. The 

 former differs from the latter only in possessing an addi- 

 tional side and angle, and in the gatherings in which it 

 occurred the quadrangular variety was rather the more 

 numerous ; both are rare, however. I do not think there 

 can be any doubt as to the form of which the end view is 

 figured (Fig. 16), being the Staurastrum monticulosum 

 (Brib.), yet as the drawing after M. de Brebisson in Ralfs 

 appeared to me as not quite characteristic, especially as 

 to the end view, at least as far as my plant was concerned, 

 having the opportunity, I have thought it might be worth 

 while to introduce a sketch. The diameter of end view is 

 rfoth of an inch ; extreme length of front view,*fojth of an 

 inch.] 

 Staurastrum gracile (Balfs), rare. 



tetracerum (Kiitz,), rare, 

 cyrtocerum (Brib.), ,, 

 asperum (Br 6b.), „ 

 enorme (Balfs), very rare, 

 spongiosum (Br 6b.), very rare. 

 aculeatum (Meneghini), rare, 

 spinosum (Brib.), common, 

 vestitum (Ralfs), rare. 

 Tetmemoru8 loovis (Kiitz), not rare. 

 Penium interruptum (Brib.), rare. 

 „ Berginii (mihi), very rare. 



[Sparingly, in a dyke above the Devil's Glen, between the 

 Waterfall and the high road ; also in a pond on the " Pipers- 

 town road," rather more than a milo beyond Ballinascorney 

 chapel.] 



