CHAP. VI. 



AURICULA. 



BULIMUS. 



181 



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

 known by the excellent figures of the French voyagers) 

 are very diiFerent from the Auricula undulata; they have 

 only two short and depressed tentacula with basal eyes, 

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

 organs common alike to Auricula undulata and Bulimtis 

 hcemastomus. 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 

 aU 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 Goniostoma 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 o/'Bultmus. 



Genera Sub-genera 

 of the of 



Turbidte. Bulimus. 



Analogical 

 Characters. 



Genera 



of 



AchatincE, 



Turbo. 



Bulimus 



'Body-whorl large,' 



itricose; spire J-BuuMUS. 



f Body- 

 •< vent 

 L shor 



TuRRiTELLA. Bulimulus 



ScALARiA. Leptospi 



hort. " " 5 

 Body, whorl more "J 

 slender; outer lip f a p„,T,,„. 

 thin, or veryf'^'^"^^"^^- 

 slightlyreflected. J 

 f Spire excessively T 

 ira. < long: body-whorl J- Clausilia. 



Sub-genera 



of 

 AchatiniS. 



Achatiniz. 



CochUcopa. 



Macrospira. 



ScissuRELLA. Goiiyostoma 



Melampus. Auricula. 



Helicina. 



Leucostoma ? 



small. J 



A slight notch or" 



channel at the( 



base of the aper- 4 



ture. 3 



r Outer lip dilated;' 



4 the margin J- Cyclostoma. Achalinella. 



L spreading. 



s 



inM 



* See an admirable memoir upon this genus by Mr. Lowe, in the Zoologi- 

 cal Journal, No. xix, p. 28U. 



N 3 



