CHAP. VI. 



AURICULA. BULIMUS. 



181 



with the TurbidfB. Certain it is, that these animals (made 

 known by the excellent figures of the French voyagers) 

 are very different from the Auricula undulata; they have 

 only two short and depressed tentacuk with basal eyes, 

 as in Pedlpes*, instead of the usual structure of these 

 organs common alike to Auricula undulata and Bulimus 

 hesmastomus. On these reasons do we restrict the sub- 

 genus Auricula to the characters above 

 stated at least, until further inform- 

 ation leads to a different conclusion. Of 

 all the species of Auricula here named, 

 the Auris-Leporis (fig. 27-) is the most 

 remarkable ; the plait on the pillar is not 

 real, inasmuch as it is not solid, but 

 formed by a sharp angle of the body- 

 whorl round the umbilicus; the aperture 

 is large, and so oblique as to appear dis- 

 torted. It is by this shell that we pass to the sub- 

 genus Gonidstoma already mentioned ( fig. 25.). The 

 five sub-genera of Bulimus will thus form a circle, and 

 present us with the following analogies : 



Analogies of the Sub-Genera of BULIMUS. 



