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



abode is on the stems and branches of trees, where it shelters itself 

 beneath the loose bark or in its crevices ; and on trees whose bark 

 from smoothness will not afford it shelter, this Balcea lurks in the 

 mosses and lichens which adorn them — in the tufts of these crypto- 

 gamous plants I have remarked it buried, whilst the Vertigo eden- 

 tula displayed itself at the outside. 



11. Clausilia, Drap. 



1. C. bidens, Drap. p. 68. pi. 4. f. 5—7 ; Gray, Man. p. 212. pi. 5. 



f. 53. 



C. laminata, Turt. Man. p. 70. f. 53. 



Turbo laminatus, Mont. p. 359. t. 11. f. 4. 

 Is a rare and local species in Ireland. The first native specimens 

 I have seen were in the collection of Mr. T. W. Warren of Dublin, 

 who had procured them in Belamont Forest near Coothill, county 

 Cavan. In Sept. 1837 I had the gratification of seeing numbers of 

 this fine Clausilia, after heavy rain ascending the stems of stately 

 trees in the demesne of Florence Court, county Fermanagh, the seat 

 of the Earl of Enniskillen. At Dovedale, in Derbyshire, I have met 

 with it. 



2. Clausilia nigricans, Jeffreys. Gray, Man. p. 217. pi. 5. f. 58. 



C. rugosa, Drap. p. 73. pi. 4. f. 19, 20 ; Turt. Man. p. 74. f. 58. 



Turbo bidens, Mont. p. 357. t. 11. f. 7. 

 Is very commonly distributed over Ireland and the surrounding 

 islands. It is an extremely variable species in being more or less 

 ventricose, in the striae being obscure or prominent, in the form of 

 the mouth, and occasionally even in the number of internal lamellae 

 — the largest specimen I have found in the neighbourhood of Belfast 

 is 1\ lines in length, and has thirteen volutions ; several others of 

 the usual length of 6 lines have likewise this number. The colour 

 commonly varies from a very pale greyish-white to deep reddish- 

 brown ; very rarely specimens of a glassy transparency occur, and in 

 such of these as I have found, the animal was equally colourless. To 

 Mr. Gray, Mr. Alder, and Mr. Forbes, I have shown the specimens 

 differing as here described, and they agree with me that they must 

 all be considered C. nigricans-]-. 



Fam. 4. " AuRicuLAD-as." 

 Gen. 1. Carychitjm, Muller. 

 1. C. minimum, Mull. Gray, Man. p. 221. pi. 7. f. 77 ; Turt. Man. 

 p. 96. f. 77. 

 Auricula minima, Drap. p. 57. pi. 3. f. 18, 19. 

 Turbo Carychium, Mont. p. 339. t. 22. f. 2. 

 This minute species is commonly distributed over Ireland, and 



f Since the above was written the fine work of Rossmassler has been con- 

 sulted, in which numerous varieties of C. nigricans or " C. rtigosa" are ad- 

 mirably represented. Icon, part 7. p. 23. fig. 477 — 187. The C. obtusa, 

 PfeifTer, which is common in Ireland, is here included (and judiciously I con- 

 sider) as a var. of C. rugosa. 



