354 COLLIER : ON THE MOLLUSCA OF CARDIGANSHIRE. 



wyth, but I think if there had only been a few showers I should 

 have taken more of this species, as I have always found it 

 abundant when it occurs. 



The inland district I found very unproductive with the 

 exception of the ruins of Strata Florida Abbey, where I got a 

 few species that I had not taken elsewhere. 



What surprised me most was that I only got two species of 

 Freshwater Shells, Limncea peregra and Ancylus fluviatilis, and 

 these only in the smaller streams. The rivers yielded nothing, 

 seemingly being poisoned with the water from the lead mines, of 

 which there are large numbers both up the Ystwyth and Rheidol. 

 There seems to be neither canals nor ponds in the district. I 

 collected a few of the slugs at Aberystwyth, and Mr. W. Denison 

 Roebuck, F.L.S., of Leeds, kindly determined them for me. 



I hope that this will only be a commencement, and that 

 other conchologists who visit Cardiganshire may be able to add 

 considerably to the list. I append list of species, with localities. 

 Limnaea peregra Miill.— Small stream running into the sea 



at the north end of the Terrace, Aberystwyth. 

 L. peregra var. ovata Drap. — Borth ; Clarach Valley, near 



Aberystwyth ; and small streams at Pontrhydfendiged, near 



the ruins of Strata Florida Abbey. 

 Ancylus fluviatilis Mlill. — Borth, common; very plentiful in 



stream at north end of Terrace, Aberystwyth; Clarach 



Valley, near Bow St. Station, a few. 

 Anion ate r var. albolateralis Roebuck. — Aberystwyth. 

 Arion hortensis var. rufescens. — Aberystwyth. 

 Amaiia marginata Miill.^ — Aberystwyth. 

 Limax maximus var. fasciata. — Aberystwyth. 

 L. agrestis var. reticulata Miill. — Aberystwyth. 

 Vitrina pellucida Miill. — Ruins of Strata Florida Abbey, 



scarce. 

 Zonites cellarius Mlill. — Aberystwyth, fine specimens. 

 Z. alliarius Miller.— Aberayron, a few ; ruins of Strata Florida 



Abbey, plentiful. 



J.C, v., Oct., 1888. 



