184 PNEUMONOBRANCHIATA. 



Varies like the last, and being more common, the 

 varieties are more often observed. 



Montagu thought the young shell was the Helix 

 ventricosa of Muller. 



The Rev. Mr. Sheppard remarks — "These shells, 

 particularly in their young state, show great sagacity and 

 ingenuity, by covering themselves with a coat adapted 

 to the different situations in which they are found ; and 

 when so covered, it is almost impossible for any other 

 than a conchological eye to discover them. If its 

 abode be upon the trunk of a tree covered with 

 lichen, then is the epidermis so constructed as to 

 cause the shell to resemble a little knot on the bark 

 covered with such substance. If on a smooth tree, 

 from whose bark issue small sessile buds, as is fre- 

 quently the case, it will pass off very well for one of 

 them; and on a dry bank, or the lower part of the 

 body of a tree splashed with mud, its appearance will 

 be that of a misshaped pointed piece of dirt." ( Linn. 

 Trans, xvi. 166.) 



Dr. Turton, in the first edition of this work, in- 

 troduced Bulimus decollatus (p. 77. f. 60.) and Bu- 

 limus clavulus (p. 79. f. 61.) ; but they cannot be con- 

 sidered as even naturalised or acclimatised, for they 

 are only found in hot-houses, warmed with artificial 

 heat. He also described B. tuber culatus (p. 81. f. 64.), 

 a Sicilian species (B. pupa Brug. ), which he intro- 

 duced on the authority of Captain Blomer, who ap- 

 pears to have given him by mistake, most probably, 

 two or three Sicilian shells as British. (See Intro- 

 duction, p. 11. and 16.) 



