PLATE CXX. 



This & a very scarce species on our coasts, and approaches so nearly 

 to Bulla pallida of Da Costa (Voluta pallida. Linn.) described and 

 figured in Plate LXV1. of this Work, that it may easily be 

 confounded with it, unless the two shells be compared. Bulla 

 Cylindrica differs in being rather more compressed, and has the pillar- 

 lip perfectly smooth ; while on the contrary the other has plaits or 

 wrinkles upon this part as before observed : a circumstance that 

 constitutes one character of the Yoluta genus in the system of 

 Linnaeus. 



In the description of the Voluta pallida we were led to think 

 with Da Costa, that the shell figured by Pennant in the British 

 Zoology, No. 85. A. might be of the same species. Since that 

 time we have been favoured with the specimen figured in the annexed 

 Plate; and as it seems to correspond more clearly with Pennant's 

 shell than the other, there can be no impropriety in removing the 

 reference from the former to the prefent species. Gmelin takes 

 not the slightest notice of this figure of Pennant ; so that we must 

 remain ignorant of his opinion respecting it. And it is certain the 

 shell before us was altogether unknown, to L)a Costa, 



D5 



