Zoolog)', 



193 



1 1 species are very local and scarce : Hyalinia Drapar- 

 naiuii, Heck (see Adams, Refers.) H. contractu^ West, 

 Limax J/civus, L., and Helix latnellata, Jeff, are confined to a 

 few stations ; H. rupestris to two localities on Antrim coast, 

 H. sericea to one in Antrim, and H. hortensis to one in 

 Down ; H. rufescens, though common in South Down, is 

 local in North Down and rare in Antrim. Buliiiiifius 

 obscuriis is local near Belfast and Larne ; Vertigo alpesiris 

 has been found only at Whitepark Bay (Standen, loc. cit.) 

 and outside the district very sparingly at only two places, 

 both on north coast; Vertigo pusi/Ia, Colin (ilen and 

 AMiitepark i!ay, rare. 



Fresh and Brackish-water Species. 



Hydrobia ulvae. Pom. 

 Valvata piscinalis, Mull. 

 V. crista ta, Mull. 

 Spha^rium corneum, L. 

 Pisidium pulchellum, Jenxfis. 

 P. fontinale, C. Pfr. 

 P. milium. Held. 

 P. obtusalis, C. Pfr. 

 P. pusillum, Gmel. 



Limncea peregra. Mull. 

 L. palustris, Mull. 

 L. truncatula, Mull. 

 Physa fontinalis, L. 

 Planorbis marginatus, Drap. 

 P. spirorbis, L. 

 P. contortus, L. 

 P. albus, Mull. 

 Ancylus fluviatilis. Mull. 

 Bythinia tentaculata, Z. 



The above are generally distributed, and some are 

 exceedingly common ; the majority plentiful in the Bann, 

 the Lagan, or Lough Neagh. The following are distinctly 

 local or rare species : a few, however, like Aplexn hypnorum 

 or Hydrobia /enkinsi, usually occur in very large numbers 

 wherever found : 



Alexia denticulata, Mont. 

 Melampus bidentatus, Mont. 

 Amphipeplea glutinosa, AIull. 

 Limncea stagnalis, L. 

 L. auricularia, L. 

 Aplexa hypnorum, L. 

 Planorbis carinatus. Mull. 

 P. glaber, Z?^/-. 

 P. crista, Z. 



M 



Planorbis fontanus, Light/. 

 Ancylus lacustris, Z. 

 Hydrobia ventrosa, Mont. 

 H. Jenkinsi, Smith. 

 Sphrerium lacustre, Mull. 

 Pisidium amnicum, Mull. 

 P. nitidum,yt'«r/'/.y. 

 Unio margaritifer, Z. 

 Anodonta cygnea, Z. 



