Terrestrial Shells of St. Thomas, W. 1. 219 



8. (22.) Achatina ? Sp. indet. 



Shell like A. 2)eUucens Ad. (Proc. Bost. Soc. p. 13, 18-45,) from 

 Jamcaica, but the columella is much curved. Length .27 inch. 



Station. — Unknown — a few dead specimens only were col- 

 lected. 



JIabitat.—RiW opposite Baker's, St. Thomas ; T. B. ! 



9. (15.) Achatina iota? Ad. Proc. Bost, Soc. p. 13. - - 1845. 



Pfr. ^roii. Hel.yiv.II.p.295.No. 150. 1848. 



It is not easy to distinguish this from the shell originally 

 described by Prof Adams as A. iota, from Jamaica, although it 

 is much larger than the shells which have been commonly dis- 

 tributed under that name. 



Station. — Unknown — dead specimens only were collected. 



^aii"to^,— Catharineberg, St. Thomas ; T. B. ! 



10. (8.) Bulimus exilis (Helix) Gmel, p. 3CG8. N. 



252, - - - 1788. 



Guadaloiqyensis Brug. Enc, Meth. I. p. 313. 



N. 26, - - 1789-179:'. 



Lam. Ed, Desli, VIII, No. 22. 1838, 



cvilis Pfr, Mon. Hel. Viv. II. p, 



223. No. 612. - 1848. 



liv. Conch, Icon, sp. 292, 1848. 



GnadaloKpcnsis Rv. Conch, Icon, sp, 294, 1848, 



Eeeve describes and figures B. exilis Gmel, as a species dis- 

 tinct from B. Guadalouijensis Brug., but Lamarck and Pfeifier 

 describe them as one species, Reeve particularizes as to the 

 former, that the sutures are inclined to be white, and as to the 

 latter, that it may be distinguished by the peculiar quadrate 

 form of the aperture. An examination of a considerable number 

 of specimens collected in St. Thomas, shows that the characters 

 pointed out by Reeve are not so constant as to warrant the divi- 

 sion into two species. Eeeve's B. ruhrifasciatus (Conch. Icon, 

 sp. 277) may be nothing more than a variety of B, exilis Gmel. 

 allied to Pfeififer's var, trifasciatus. Reeve, alluding to B. ruhri- 

 fasciatus, says, that Deshayes, he believes, has " proposed the 



