PROCEEDINGS OF SOCIETIES. 87 



Planorbis marginatus. Very abundant, of the common form ; some with a very 

 slight line indicating the keel, and a few without any trace of it. Plan- 

 orbis carinatus is found in the marl, and is the only marl shell which 

 I have not found living in the district. 

 N vortex. Abundant ; rarely with the white rib inside the mouth. 

 „ spirorbis. Abundant ; occasionally is seen with the white rib within 



the mouth. 

 „ nitidus. Rare ; in one pond, at Pinnoe. 

 „ contortus. Very abundant. 

 Cyclas cornea. Abundant ; varying considerably in globosity and size. 

 Pisidium obtusale. Rare and local. 

 „ nitidum. Not uncommon. 

 ,, pusillum. Abundant. 

 ,, pulchellum. Common. 



,, Henslowianum. Very rare and local. I obtained a very few specimens, 

 in drains, near the river, now dried up. The shells scarcely exceeded 

 one-eighth of an inch in length, and the laminar projections were not as 

 prominent as they are represented in Mr. Jenyns's monograph. All 

 these small Pisidia were determined by my friend, the late Mr. William 

 Thompson, from shells sent to him, to Belfast. I found shells of all 

 the species agreeing, pretty accurately, with the typical figures and 

 descriptions of Jenyns ; some belonging to his varieties, and some not 

 easily reducible to them. 

 ,, amnicum. Rare and local. 

 This small district thus possesses 66 of the 96 species recognised by Mr. William 

 Thompson, in his Catalogue (Ann. and Mag. Nat. Hist. VI., p. 16, Sept. 1840), as 

 being Irish. I might, perhaps, have added Limax flavus, Helix hybrida, Helix 

 hortensis, and Helix sericea ; but I would not introduce any species I was not per- 

 fectly certain of. It will be seen, that I obtained several additional species, at 

 Finnoe, since 1840, by reference to Mr. Thompson's Catalogue, under the head of 

 Finnoe. 



My observations on these mollusca lead me to think that some zealous investi- 

 gators of this branch of zoology, from the very natural desire of making its arrange- 

 ment as accurate and minute as possible, have unnecessarily multiplied species 

 which, independent of the error, much embarrasses those studying either the shells 

 themselves, or the works written on them. 



Dr. Lyon Playfair considered that such lists, from various localities, would be 

 very valuable. 



Professor Allman urged the necessity of local lists, this being the true way to 

 arrive at the knowledge of geographical distribution, and that such knowledge 

 would ultimately be of beneficial results. 



Mr. J. R. Kinahan then exhibited specimens of a bat, taken in the County 

 Kildare, and gave the following reasons for considering it to be a distinct species 

 from the Vespertilio pipistrellus : — 1st. The hairy fringe on the interfemoral. 2nd. 

 The greater number of false molars in Natterer's bat. 3rd. The difference in shape 

 of the trajus; in Natterer's bat long and pointed, in the pipistrelle short, and 

 rounded at its extremity. 4th. The different colours ; Natterer's bat being dark- 

 greyish red on the back, silvery white on the belly ; while the pipistrelle is a uni- 

 form light gray. 



Mr. Kinahan, while referring these specimens for the present to Natterer's bat, 

 pointed out differences between them and the description in Bell's British Quad- 

 rupeds, and also the specimen of this bat killed at the Scalp, in 1849. These 

 were : — 1st. The non-development, to any extent, of the sebaceous follicles of the 

 nose. 2nd. The greater number of interfemoral nervous bands (a character which 

 differs in almost all Mr. Kinahan's specimens). 3rd. The shortness of the spur 

 of the heel. 4. The fringe being continued beyond the hind paw, half-way up to 

 the last finger. 5th. The comparative shortness of the trajus. 



The President did not ccnsider this bat to be V. nattereri ; it did not agree with 

 that species as described by Demarest, or Baron de Sely's Longchamps. Its most 



