CONTRIBUTIONS TO CONCHOLOGY. 



]¥o. S. 



Descriptions of supposed New Helicid.b from Jamaica. 

 Continued from p. 32. 



Helix tunicata. Sliell globose-conic ; white beneath a tliick 

 epidermis, which is yellowish brown on the spire, and dark brown 

 on the last whorl, and peels off in flakes in the early stages of decay ; 

 with fine string of growth and very lightly impressed spiral lines ; 

 spire conic, well elevated, with the outlines a little convex ; apex 

 acute ; whorls five and one-half, rather convex, with a well impress- 

 ed suture; aperture subquadrate, with the outer angle rounded off; 

 labrum thin and sharp; columella pure white, dilated, somewhat 

 spiral ; umbilicus none. 



Mean divergence 110°; greatest breadth 1.05 inch; least breadth 

 .85 inch ; height 1 inch. 



This species differs from H. munda in the conical and more ele- 

 vated spire, greater size, stouter and subspiral columella, &lc. 



Helix sulphurea. Shell sub-globose, conic above, and a little 

 tapering below ; yellow, nearly transparent ; smooth and shining ; 

 spire with the outlines a little convex, well elevated, conic ; apex 

 very small and acute ; whorls four, a little convex, with a well im- 

 pressed finely margined suture; last whorl very long; aperture sub- 

 subovate ; labrum very thin and sharp; columella much produced, 

 nearly straight ; umbilicus none. 



Mean divergence 90° ; greatest breadth .175 inch; least breadth 

 ,13 inch; height .16 inch. 



Perhaps this is a young shell, but probably not of any described 

 species. 



Helix virginea. Shell conic ; pale brown, with the upper 

 whorls and a zone on the periphery horn colored, with narrow por- 

 tions of epidermis scattered somewhat in zigzag, which are white 



