332 Rev. B. J. Clarke on Irish species of the genus Limax. 



The skin having been left upon the toes of the hind-fins, 

 showed the presence of a very small claw on each of the five 

 digits. 



I do not consider the modifications of the compressed and 

 deep-cleft molars of sufiicient importance to justify the introduc- 

 tion of a new generic name into the group of amphibious or pin- 

 nigrade Carnivora, which has already been overburthened. The 

 new species of StenorhynchuSy combining a small head and mode- 

 rately elongated muzzle, with the peculiarly diminutive claws of 

 the genus, renders requisite, however, a slight modification of the 

 generic character. 



Genus Stenorhynchus. 

 Dental formula :— inc. ?=? ; Ian. ^=i ; mol. ^=5 = 32. 



2—2 ' 1—1 ' 5—5 



Molars subcompressed, deeply notched into three or more lobes ; an- 

 terior molars with one root, the rest with two roots*. 

 Head small ; muzzle more or less elongated. 

 Claws diminutive. 



Sp. 1. Stenorhynchus leptonyx, F. Cuv. Molars trilobate, lobes 

 acute ; muzzle slender and elongated. 



Sp. 2. Stenorhynchus Weddellii, Lesson. Molars trilobate, lobes ob- 

 tuse ; muzzle broad and less elongated. 



Sp. 3. Stenorhynchus serridens, mihi. Molars, three anterior ones 

 4-lobate, two posterior ones 5-lobate in both jaws, lobes obtuse ; 

 muzzle moderately long and slender. 

 All the species are limited to the Southern Ocean. 



XLII. — On the Species of the Genus Limax occurring in Ireland. 

 By the Rev. B. J. Clarke, Mem. of the Dub. Nat. Hist. Soc. 



[With three Plates.] 



During the summer of the year 1840 1 supplied Wm. Thompson, 

 Esq., of Belfast, with a list of the species of Limax which occun'ed 

 to me in the Queen^s county, for the purpose of introducing them 

 into his ' Catalogue of Irish Land and Freshwater MoUusca,^ pub- 

 lished in the thirty-sixth Number of the ' Annals and Magazine 

 of Natural History,^ and where it appeared as an appendix to his 

 paper. From the limited time allowed me previous to the pub- 

 lication, I had not an opportunity of satisfying myself as to the 

 identity of two species there introduced in a doubtful manner, 

 and which I believed differed materially from any species hitherto 

 described as British. 



* The translator of Cuvier's ' Regne Animal/ Orr's ed. 1 vol. 8vo, 1840, 

 adds, erroneously, to the generic character of Stenorhynchus in the text of 

 the author, " (but with single roots)," p. 98. 



