414 MILNE : CONTRIBUTIONS TOWARDS IRISH MOLLUSCA. 



Physa hypnorum only lives in the tributaries of the Risson 

 river, near Newport, the Limnsea come next. Of these 



Limnaea peregra is plentiful and fine in Lough Doo; smaller 

 specimens are found in a ditch near Dugort village, and 

 still smaller in Lough Nakeeroge. It also occurs in 

 brackish water on Keel Strand ; the specimens there are, 

 however, of a fair size. The variety ovata, which is the 

 usual form on the mainland, seemingly only inhabits a 

 brook below Dugort. 



L. auricularia var. acuta is found sparingly in Lough Doo. 



L. palustris does not advance beyond the limestone; but 



L. truncatula, which takes its place on the sandstone, con- 

 tinues into iVchill, where it occurs in the brook below 

 Dugort and with P. pusilhtm in the dry ditch, the latter 

 being fine specimens, while those from the water were 

 small enough to be referable to var. minor. 



This brief list, I believe, exhausts the species of fresh- 

 water snails found in the north of Achill Island ; the 

 number of land-dwellers is much larger. 



Arion ater. — To take the slugs first, Arion ater occurs in 

 great numbers, especially in half-reclaimed peat fields, 

 but extending thence on to the heather, all over Slieve- 

 more mountain — from the colony up to the top and down 

 again to Annagh Bay — where it is accompanied by var. 

 nigrescens, and also in the fields at Dugort. 



A. hortensis, true to its name, sticks to the gardens at the 

 Colony and the little patch of reclaimed land at the Signal 

 Tower. 



A. subfuscus was taken in a ruined cottage at Slievemore 

 village, and its var. cinereo-fusca at the Colony. 



Amalia marginata. — Both species of Amalia occur. A. 

 marginata was represented by a half-grown specimen from 

 Dugort village ; while of the 



A. gagates I sent Mr. Roebuck, he named one from Dugort 



}.C., vi., Oct., 1891. 



