118 Mr. W. Thompson's Catalogue of the Land and 



Lichfield, in July, 1836, are more distinct than any which I have seen 

 represented ; the spire is more minute, and the upper part of the outer 

 lip goes off from the body of the shell in the form of a straight line ; 

 but of all the individuals obtained on this occasion no two are pre- 

 cisely alike, but vary from the extreme form described to the L. ova- 

 tus, Drap. 



2. Limneus pereger, Drap. p. 50. pi. 2. f. 34 — 37 ; Gray, Man. p. 

 233. pi. 9. f. 101f; Turt. Man. p. 118. f. 101. Avery rare 

 form. 

 Helix peregra, Mont. p. 373. t. 16. f. 3. 



This species, presenting endless variety, is abundant throughout 

 the waters of Ireland, from the smallest drain to the vast expanse 

 of Lough Neagh. Some of the forms which have been considered 

 as distinct species may be enumerated as occurring in this country, 

 as L. ovatus, Drap., L. intermedia, Michaud (Comp. pi. 16. f. 17, 18.), 

 L. marginata, Mich. (Id. f. 15, 16.), L. lineatus, Bean, L. acutus, 

 Jeffreys — of these two last I judge from comparison of authentic 

 specimens, the former favoured me by Mr. Alder, the latter by their 

 describer. One variety seems to require especial notice — the Gul- 

 naria lacustris, Leach. On the shores of Loughs Neagh and Earn 

 I have collected specimens identical with those so named by Dr. 

 Leach in the British Museum, and which are from the lakes of Cum- 

 berland — their donor General Bingham. It would seem to be the 

 same form which Capt. Brown figures under the name of " Lymnsea 

 lacustris, Brown's MSS.," and states to have been found by him in 

 Loch Leven, Kinross-shire. Illustrations Brit. Conch., pi. 42. f. 24, 

 25. From lakes in various parts of Ireland I possess this form, which, 

 from its extreme delicacy, I look upon as an inhabitant of still water, 

 and from its rare occurrence, except when cast ashore, of deep water 

 also. The specimens, which containing the living animal, have occa- 

 sionally been found in shallow water, have I presume been driven 

 thence in storms, to which conclusion I am led by having once at 

 Lough Earn, and frequently at Lough Neagh, looked in vain for a 

 living individual with a shell of this form at the edge of their wa- 

 ters, though plenty of the more common forms of L. pereger were 

 there. The variety under consideration is intermediate in form be- 

 tween the typical L. pereger and L. glutinosus, with a short spire 

 and ample aperture ; shell very thin, longitudinally striated ; striae 

 regular, frequent, and strongly marked ; about one in thirty of the 

 specimens examined somewhat spirally cut, "like the facets of 

 glass"; slight fold on the pillar lip ; an epidermis-like covering, of a 

 dull greenish-yellow colour. By the chief cultivators of this branch 

 of natural history in Great Britain, to whom I have sent this shell, 

 it was considered a particularly well-marked variety \, and M. 



f The wood-cut at p. 235 is much more characteristic than figure 101, 

 which is that of the first edition repeated. I have shells similar to f. 101, 

 from the vicinity of Belfast. 



X Mr. Gray remarks — " The Gulnaria lacustris of Leach is very peculiar, 

 from the erosion of its tips, probably arising from its locality, the lakes of 



