92 



Proceedings of the Royal Irish Academy. 



APPENDIX. 



List of Mollusca occurring in Lough Neagh. 



The following list of the mollusca occurring in the lake has been very 

 kindly drawn up by Mr. E. Welch, m.r.i.a. : — 



Gastropoda. 



LiMNAEIDAE. 



Ancyclus fluviatilis Mullrr. 



lacustris Thomi^son. 

 Limnaea pereger (MicUer). 



stagnalis (Linne). 



palustris (Muller). 



truneatula {Muller). 

 Planorbis albus Muller. 



carinatus Muller. 



spirorbis {Linni). 



contortus {Linne). 



fontanus {Lightfoot). 



Physidae. 



Physa f ontinalis {Linni) . 

 Paludestkinidae. 



Paludestrina jenkinsi Smith-. 

 Ears in 1900. Now present in 

 myriads. 

 Bithynia tentaculata {Linne). 

 Valvatidae. 



Valvata piscinalis [Miiller). 

 cristata Muller. 



Lamellibkanchiata. 



Unionidae. 



Anodonta cygnea {Linne). 

 (:!"srenidae. 



Sjibaerium corneum {Linne). 

 lacustre {Miiller). 



Pisidiuni amnicum {Muller). 

 subtruncatum Malm. 

 pulchellum Jenyns. 

 obtusale Pfeiffer. 

 pusillum {Gmelin). 

 milium Held, 



