25 



AciiATiNA ELEGANS may be a variety of A. PJdlUpiana Pfr., but 

 it has the strife extremely fine, and the dark brown stripes are much 

 narrower. Dr. PfeifFer's species has the stri« very coarse and the 

 stripes very wide. 



AcHATiNA NEJroRENsis. Shell subfusiform ; pale brown or pale 

 reddish brown, with dark brown transverse stripes, which are not 

 very wide, reaching nearly to the anterior extremity, about four on 

 each whorl except on the first three, which have none ; with very 

 dense rather small striae ; spire with the outlines quite convex ; 

 whorls eight, moderately convex, with a well impressed suture ; aper- 

 ture long, narrow in the u[iper half, and very acute above; labrum 

 sharp, produced along the middle, a little angulated below the middle ; 

 columella nearly straight, rather slender, and pointed. 



Mean divergence 30'' ; length .83 inch ; breadth .25 inch ; length 

 of aperture .35 inch. 



Var. a, with very few brown stripes. 



AcHATiNA LiGATA. Shell elongate, subconic, with a broad deep 

 constriction around the middle of the last whorl ; pale brown, with 

 dark brown narrow ■ transverse stripes, which are sometimes nearly 

 obsolete, of which there are about three on each whorl, except on the 

 first three or four, which have none ; varicate at the last one or two 

 brown stripes, with rather fine crowded transverse striae ; spire with 

 the outlines moderately convex ; apex small ; whorls about seven and 

 one half, a little convex, with a well impressed suture ; aperture long, 

 much modified by the intrusion of the labrum at the constriction of tlie 

 last whorl ; labrum thickened at the constriction ; columella a little 

 twisted and arcuated. 



Mean divergence 24° ; length .G8 inch ; breadth .195 inch ; length 

 of aperture .26 inch. 



AcHATiNA ANGiOSTOMA. Shell fusiform ; pale reddish, with 

 transyerse rather narrow dark brown stripes, of which there are about 

 four on each whorl except on the first three ; with extremely fine 

 crowded transverse stria?; spire with moderately convex outlines; 

 apex rather small ; whorls seven, moderately convex, with a well im- 

 pressed suture ; aperture very long and narrow ; labrum very thin 

 and sharp; columnella produced to an extraordinary degree, straight, 

 a little twisted. 



Mean divergence 34*^; length .72 inch; breadth .22 inch : length 

 of aperture .36 inch. 



AciiATiNA Ingallsiana. Shell fusiform ; pale brownish, with but 



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