276 PNEUMONOBRANCHIATA. 



line, from which some very fine striae radiate towards 

 the circumference. 



The variety is much smaller in all its parts, and 

 rather more finely striated. 



Lister (Tab. Anat. iv. f. 1, 2, 3.) gives some ac- 

 count of the anatomy, and a very detailed description 

 has lately been published by the Rev. Mr. Berkeley 

 (Zool Journ. iv. 278.). 



Montagu gives a good description of the animal, 

 but he thinks Lister was wrong in not describing 

 the black tips to the tentacles as eyes, as well as 

 the real eyes which are at their base. Time has 

 proved, I think, that " his conjecture " was not 

 just. Indeed the whole of Montagu's article on this 

 animal is curious, as showing how desirous the older 

 conchologists were to gain some knowledge of the 

 animal of the shell they were describing, and to form 

 theories from the few they then knew. (See Test. 

 Brit. 346.) 



Mr. Jeffreys has placed in this genus, as a Pneumo- 

 nobranchous Mollusca, Turbo truncatus of Montagu, 

 because he found it mixed with some other land shells 

 in some fine sand from Weymouth. This is a marine 

 shell belonging to the genus Truncatella of Risso, 

 and respires by gills. (See Berkeley, Zool. Journ.) 



