306 
MOLLUSCA. 
and by Jeffreys (p. 390) as being pellucid, &c., I find upon the first stones 
wet by mountain springs, on their gushing from the earth. All the spe- 
cimens from these localities are much smaller than those found in still 
water, and coated with green vegetable matter, which is entirely adventi- 
tious, and may be seen in like manner coating the little prominences of 
the stone to which the Ancylus adheres ; this and the animal being re- 
moved, the shell is crystalline. Under the name of “ Ancy. Jiuviatilis, 
Drap. var. montana,” M. Michaud has favoured me with specimens from 
the Pyrenees, quite identical with the var. just noticed, as, it need hardly 
be remarked, are others from France with the ordinary form. 
I had often observed that beautiful and graceful bird the grey wag- 
tail (Motacilla boarula) feeding about the mountain springs, but was not 
aware of its propensity for mollusca, until, on opening the stomach of one 
without knowing where the specimen had been killed, I found it to be 
filled with shells of this species, all of which being of the var. a. afforded 
evidence whence they had been procured. 
Animal bluish-grey beneath ; portion which comes in contact with 
the shell blackish-green. Of six specimens which I once kept in a dry 
chip box for eighteen hours, two perfectly recovered on being immersed 
in water. 
A. lacustris , Mull. 
This species, although rare, has been met with in the North, East, and 
West of Ireland, in still and gently-flowing waters. It was noticed by 
Captain Brown in his Irish Testacea as “ plentiful in a mill-race a mile 
below Naas.” By the late Mr. Templeton’s MSS. I find that the species 
had been previously observed by him “ on Potamogeton, &c., in the drains 
of the bog-meadows near Belfast.” Between the fourth and fifth locks of 
the Lagan canal, a few miles from this town, I have, at the end of Sep- 
tember, procured many specimens, all of which were on the under side of 
the leaves of the yellow water-lily ( Nuphar luted) and great water-plan- 
tain ( Alisma Plantago ) — Pond in the demesne at Moira, County Down, 
Mr. Hyndman — Near Limerick, Dr. W. H. Harvey — Beechwood, near 
Portmarnock, County Dublin, Mr. T. W. Warren — Glasnevin Botanic 
Garden, Dublin, Dr. Coulter — Finnoe, County Tipperary, and Derryadd 
Lake, County Armagh, Mr. Edward Waller. 
Genus Physa. 
P. fontinalis, Drap., 
Is common, and generally distributed over Ireland, occurring on 
aquatic plants in stagnant and gently-flowing water. It is subject to con- 
siderable variety. 
P. hypnorum , Drap., 
Although much less common than P. fontinalis , is generally diffused 
over the island, and found as frequently in very shallow as in deep 
water. 
Genus Planorbis. 
P. corneus, 
Has been found only within a very limited portion of the island. It 
still prevails in the locality recorded by Capt. Brown — near Maynooth, 
