DESCRIPTION. 177 



At any rate it constitutes one more link in the 

 great chain of nature, that which connects Testacea 

 with Zoophyta. 



Fig. 2. Trochus bifasciatus. 



Shell thin, pellucid, pyramidal, imperforate, 

 whorls acutely carinate. 



Nondescript. 



Specimen white, with two purplish brown trans- 

 verse bands and a dark brown apex. 



Inhabits Pernambuco. 



Fig. 3. Helix gibberula. 



Shell conical, imperforate, gibbous ; aperture 

 toothed, compressed. 



Nondescript. 



Specimen reddish white, with a pale brown cloud 

 and mark on the columellar side, and two brown 

 bands upon the base ; aperture white, with seven 

 teeth, two nearest the exterior margin bent ; outer 

 lip margined, acute; — whorls six, smooth. 



Inhabits Pernambuco. 



