Varieties of Land and FlumatiU Shells of Jamaica. 15 



the whorls are closely striated, with much arcuated strise. 

 Spiral outlines slightly convex. Whorls IOJ, well convex, 

 with a well impressed suture Aperture short, the upper 

 part projecting angularly from the whorl above : well 

 rounded below, till it meets the columella almost at 

 right angles. Labruin sharp, constricted inwards about one 

 third down. Columella rather straight, slender and pointed. 



Divergence about 15, length .S, breadth .14, 



Ilabitat, near Swift River, St. George's 



Named, in memory of the late Professor C. B ADAMS. 



N. B. Tho' somewhat resembling it, this shell must not 

 be mistaken for the A. Adamsi, Pfr., the Ach. Costulata, 

 ADAMS. See Reeve, Conch. Icon. Ach. : Sp. 112. 



SPIRAXIS AS A NEW GENUS OF HelicidcB. Whatever may be 

 the opinion of others (and I hope there are none at variance 

 with mine,) I take this opportunity of expressing my thanks 

 (as it were) to the late Professor C. B. ADAMS for the in- 

 vention or rather proposition of this new genus, Sjriraxis. 

 Doubtless some of the Jamaica Shells already classed under 

 it, may, by and bye, be classed under another more dis- 

 tinguishing head, especially S. mirabilis^ AD. S. contort u^ 

 CHITTY. Yet before he named and described this new 

 feature, namely, " with the collumelia produced into a large 

 stout spiral lamina," as sufficient to ground on it a genus, 

 there were Jamaica Shells, which it was impossible to say, 

 whether they were referable to Bulimi or Achatina. 



I should suggest that Achatina Ificans should be trans- 

 ferred to Spiraxis. Of Foreign Bulimi and Achatina 

 there seem to me, on reference to Reeve's Conch. Icon., to 

 be many which belong to genus binrdxip ; such as B. 

 PhiUpeneiixiS) B. DapJmis, B. maculiferus, (though 

 I doubt Shells sinistral being of the same genus with Shells 

 dextral.) B. Calypso. B. eincinnus, B. in-ferstinctus, B. 

 Sikkimensis, AcJi-atina lamelloso, A. anomola, A Bv.ll- 



nwides* A. 7>v- '/>'. .1. Fii<:ki. A. fiammigety cum- 



7 ,. 7 .. 

 multu 



