SUCCINEA. 135 



below, ranges from ovate to elongated ovate according to 

 the general shape ; it is moderately large for the genus, fill- 

 ing from half to at most two-fifths of the ventral area. 

 The outer lip does not project abruptly above, and is more 

 arcuated below than above. The pillar lip in the broader 

 examples is moderately arcuated, in the narrower ones is 

 more frequently straightish. Large individuals attain to 

 three quarters of an inch in length. 



The form amphibia is oval, more or less swollen, and of 

 a more pallid and less rufous yellow than in the succeed- 

 ing variety. Its whorls are typically much rounded ; its 

 suture not peculiarly oblique ; and its spire never elon- 

 gated. The mouth is ovate, fills about two-thirds of the 

 length, and does not recede much at the anterior extre- 

 mity. The pillar is more or less curved. 



Tn the slender and often compressed Pfeifferi the shape 

 is oblong-conic ; the growth, as indicated by the slanting 

 suture, very oblique ; and the colouring, though occasion- 

 ally dirty yellow, oftentimes reddish amber. The whorls 

 (barely three in number) are never ventricose, are flattened 

 above, and rounded below ; their apex is peculiarly minute. 

 The aperture is much elongated, and recedes considerably 

 below : the inner lip is more or less straight. 



In the variety intermedia^ whose aspect presents the 

 modified peculiarities of either of the preceding extreme 

 forms, there are three and a half coils, so that the spire is 

 occasionally more elongated in proportion than in Pfeifferi 

 or amphibia. 



The animal of the form amphibia is usually pale and 

 often of a yellowish hue, mottled with dusky, and striped 

 darkly down the centre of the neck ; the tentacula are 

 very stout at their bases, and very pale ; the tail is obtuse 

 and expanded. That of the form gracilis is usually much 



