26 



four or five dark brown transverse stripes ; with very minute rather 

 numerous but not crowded transverse strioR ; spire with moderately 

 convex outlines ; apex rather small ; whorls seven, moderately convex, 

 with a well impressed finely corded suture ; aperture very long, rath- 

 er narrow ; lip thin, with the edge sharp and curved forwards ; co- 

 lumella moderately produced and arcuate. 



Mean divergence oG°; length ,75 inch; breadth .25 inch; length 

 of aperture .35 inch. 



AcHATiNA UNicoLOR. Specics similar to the preceeding, but the 

 shell is uniformly light brown, Avithout any dark stripes ; the striae are 

 rather more strongly impressed ; the columella is not arcuate ; and the 

 form is rather mox'e slender. 



Mean divergence 33°; length .7 inch; breadth .21 inch; length 

 of aperture .33 inch. 



AcHATiNA LEVIS. Shell much elongated, conic ; very pale brown, 

 shining ; very thin, smooth, with microscopic transverse striae, which 

 are quite numerous on the upper whorls ; spire with rectilinear out- 

 lines ; apex not very small ; whorls seven, a little convex, with a 

 moderately impressed suture ; aperture ovate, acute above ; labrum 

 thin and sharp ; columella slightly arcuate. 



Mean divergence 14'^ or 15°; length .42 inch; breadth .1 inch; 

 length of aperture .13 inch. 



This may be a variety of A. pellucens ; but that shell has more nu- 

 merous striae, a constant difference in the individuals which I have 

 seen. 



AcHATiNA MicANS. Specics similar to A. levis, but the shell is less 

 elongated, the outlines of the spire are more convex, the apertui-e is 

 shorter, and the columella is more twisted and not arcuate. 



Mean divergence 17^^; length .41 inch; breadth .115 inch; length 

 of aperture .12 inch. 



AcHATiNA STRIOSA. Shell clongatcd, conic; white, with a horn 

 colored epidermis, which is much striated transversely ; the shell is 

 smooth ; spire with nearly rectilinear outlines ; apex not very small ; 

 whorls eight, short, moderately convex, with a deep suture ; aperture 

 short, ovate, moderately acute above ; labrum thin, sharp, not produ- 

 ced along the middle ; columella short, broadly truncated, much arcu- 

 ated. 



Mean divergence 17° ; length .28 inch ; breadth .085 inch ; length 

 of aperture -08. 



ACHATiNA iNusiTATA- Shell elongated, gradually tapering in the 



