SECTION B.] NORTH AMERICAN CONCHOLOGY. 



501 



[Contributions to Conchology.] 

 Page. 



205 Remarks on certain Helices which are described and figured in the 

 Conchologia Iconica for Oct. 1S51 : by Prof. C. B. Adams. 



207 Hints on the geographical distribution of Animals, with special 

 reference to the Mollusca : by Prof. C. B. Adams. 



215 Catalogue of the Terrestrial Shells of St. Thomas, West Indies: by 

 Thomas Bland, F. G. S., London. 



215 Helix depicta Grat. 218 



216 plicaria Lam. 

 216 squamosa Fer. [Per. 219 

 216 Bulimus baeticatus (Helix) 219 

 216 badiosus (Helix) Fer. 219 

 216 Pupadecumana(Helix)i r er. 

 216 Cylindrella gracilicollis 220 



(Helix) Fer. 220 

 216 Maugeri (Helix) Wood. 

 216 Cyclostoma Antillarum *S6. 



Meyalomasloma Antillarum 221 



Gray. 221 



216 Newcombianum Ad. 221 



C. Swiftianum Ad. 



Troscheli Ad. 221 



Newcombianum Ad. 222 



217 Helicina subfusca Mice. 222 



Eel. rotulina Mich. 222 



castanea Gould? 222 



Hornbeckn Phil. 



subfusca Kiist. 223 



217 ? (sp. ined.) 223 



217 Cylindrella pallida (Bra- j 223 



chypus) Guild. 22:) 



218 ? (sp. ined.) j 224 



Achatina octona Ckemn. 

 Bulimus octona Lam. 



? (sp. ined.) 



? iota Ad. 

 Bulimus exilis(Helix) Gmel. 

 B. Guadaloupensis Brag. 

 var 8 trifasciatus Pfr. 

 virgulatus (Cochlogena) 

 Fer. 

 B. Caribbeonum Lam. 

 ? Dysoni Pfr. 



? (sp. ined.) 



? subula (Achatina) Pfr. 

 B. hortensis Ad? 



? (sp. ined.) 



? (sp. ined.) 



Pupa servilis ? Gould. 

 Succinea Sagra? Orb. 

 Helix incerta (Helicostyla) 



II. lima Rye. 

 nemoralina Pet. 



? (sp. ined.) 



? (sp. ined.) 



? peraffinis Ad. 



? (sp. ined.) 



[Fer. 



