300 Linncean Society. 



North of Ireland, (on the shores of which country the species has 

 not before been recorded as met with,) that the fish so named by 

 Donovan, with which these were identical, is distinct from the G. 

 niger of Pennant, and as such ranks as a third species of Gobius 

 to the British Fauna, two species only having yet a place in it. 



The CyclopterusMontagui (Don.), which stands recorded as having 

 been taken only on the southern coast of England, and there but 

 by its discoverer, was next introduced, from the circumstance of a 

 specimen occurring to the author on the coast of the county of 

 Down in December 1833. The difference, consisting chiefly in 

 colour and markings between this fish (which was mature) and Col. 

 Montagu's as described in the Wern. Mem. (vol. i. p. 92.), was pointed 

 out. 



Specimens of all the species treated of in this paper, with the 

 exception of the Cygnus Bewickii, were exhibited. 



Mr. Thompson further announced the following species of land 

 and freshwater shells to be indigenous to Ireland, though they have 

 not been recorded as such. They do not appear at least in any of 

 the three published catalogues of the shells of that country, nor is 

 he aware of their being incidentally noticed elsewhere. 



They were brought forward on this occasion preparatory to a 

 general catalogue of the land and freshwater shells of Ireland, with 

 observations on the relative abundance and scarcity of the species, 

 their geographical distribution, &c, which Mr.T. hopes to lay before 

 the Society early in the ensuing year. 



Pisidium nitidum, Jenyns. P. pidchellum , J enyns. Limacella Par- 

 ma, Lister. Testacellus Scutulum, Sowerby. Vitrina Drapamaldi, 

 Jeffreys. — Helix hortensis, Montagu. This species and the Helix as- 

 persa do not both appear in any catalogue of Irish shells. Capt. Brown 

 enumerates the H. hortensis in his " Irish Testacea," but his re- 

 ference to Donovan (t. 131.) makes it evident that it is the H. as- 

 persa of Montagu, which he brings forward under the name of hor- 

 tensis. — H. hispida. In the "Irish Testacea" the Helix hispida is 

 described to be that of Montagu, and of Donovan also ; but as the 

 same name is applied to two different species by these authors, and 

 as one species only has yet been recognised as found in Ireland, I 

 now add the second, as lam in possession of Irish specimens of the 

 hispida of both authors. — H.spmulosa, Montagu. HAucida*, Dra- 

 parnaud. H, nitidula, Draparnaud. H. alliaria, Miller. H. cry- 

 stallina, D rap. H.radiatula, Alder. H.pura?, Alder. H.pygmcea, 

 Drap. H. Scarburgensis , Bean. Clausilia bidens, Drap. Cary- 

 chium lineatum, Ferussac. Bulimus Acicula, Drap. Pupa edentula, 

 Drap. P. muscorum (a.), Drap. P. Secale, Drap. P.pygmcea, Drap. 

 P. Antivertigo, Drap. P. Vertigo, Drap. P. sexdentata, Alder. 

 P. (Turbo) Vertigo, Montagu. P. (Vertigo) Anglica, Ferussac. Pla- 

 norbis spirorbis, Drap. P.glaber? Jeffreys. P. lutescens, Lamarck, 

 or P. carinatus, Drap. As in the case of the Helix hortensis and 



* This species should not perhaps be included here, as Mr. Jeffreys re- 

 marks of it, under the title of H. nitida, that he has received a specimen of 

 a variety of this shell from Mr. Dillvvyn as Irish. 



