succinic. 1 2 7 



inantle is not produced into lobes, or developed and reflex ed 

 over the aperture, the caudal gland is absent, and the shell 

 is adorned with varied markings, and assumes nearly every 

 modification conceivable in the form of a hollow, spiral cone. 

 The Helicida abound most in humid tropical regions, 

 especially iu islands; they are, however, universally dis- 

 tributed wherever there is vegetation, from the equator to 

 the poles, from the bosom of luxuriant valleys to the summit 

 of barren mountains. 



Sub-fam. SUCCININ^. 



Lingual teeth as in Helix. Animal bulky; tentacles short 

 and thick ; foot broad. 



Shell thin, homy, ovate or oblong ; spire small ; aperture 

 large, oval ; columella simple, not truncate anteriorly ; peri- 

 stome acute. 



Inhabit damp places in the vicinity of water. 



Genus SIMPULOPSIS, Beck. 



Shell semi-oval, very thin, membranaceous; whorls few, 

 the last ventricose; aperture wide, oblique, roundly oval; 

 columella arcuated; peristome simple, acute. 



Ex. S. sulculosa, Ferussac, pi. 73, fig. 1. 



The species of this genus are from Portorico and the 

 province of Bahia in Brazil. They have been generally 

 considered as mostly allied to Vitrina, but the recent 

 observation of the animal by Mr. Shuttleworth proves them 

 to be near Succinea. The mantle is not appendiculate as 

 in Vitrina ; the teeth and lingual membrane, however, are 

 generically different from those of Succinea. 



