104 



resembles A. Phillipsii, but its spire is shorter, with a greater diver- 

 gence. 



Mean divergence about 22^ ; length of spire .45 inch ; total 

 length .75 inch ; breadth .23 inch, 



AcHATiNA TENERA. Shell elongate, somewhat conic : horn color : 

 with numerous well impressed regular transverse striae : apex sub- 

 acute : spire with the outlines a little convex : whorls seven and one- 

 half, scarcely convex, somewhat shouldered above, with a well im- 

 pressed suture : aperture ovate, acute above: labrum thin, slightly 

 advanced in the upper half, retreating below : columella moderately 

 curved, distinctly truncated. 



Mean divergence about 14°; length of spire .21 inch; total length 

 .3 inch ; breadth .075 inch. 



Achatina longispira. Shell much elongated, conoidal : pale 

 brown : shining, with very lightly impressed not very numerous 

 transverse striae: apex obtuse: outlines of the spire slightly curvi- 

 linear : whorls ten, moderately convex, with a well impressed suture : 

 aperture subrhomboidal, subacute above: labrum thin, slightly ad- 

 vanced in the upper half, retreating below : columella very oblique, 

 distinctly truncated. 



Mean divergence about 12° ; length of spire .33 inch ; total length, 

 .45 inch ; breadth .09 inch. 



AcHATiNA GRACiLioR. Shell couoidal, but very slender : pale 

 horn color : with about twelve transverse oblique slightly prominent 

 lamelloid ridges, which are more distinct next below the suture : apex 

 rather acute : spire with the outlines nearly rectilinear : whorls 

 eleven, a little convex, with a distinct suture : aperture ovate, very 

 acute above, retreating below on both sides, but less on the left side : 

 labrum thin : columella moderately arcuated and truncated. 



Mean divergence about 9° ; length of spire .43 inch ; total length 

 .55 inch ; breadth .09 inch. 



AcHATiNA oscuLANs. Shell conoidal, but very slender ; dull horn 

 color ; with about fourteen transverse oblique rather prominent la- 

 melloid ridges, which are somewhat arcuated with the convexity for- 

 wards : apex rather obtuse : spire with the outlines rectilinear, ex- 

 cept near the apex : whorls nine, flattened or concave along the mid- 

 dle, with a well impressed suture : aperture ovate, very narrow and 

 acute above, retreating much below on both sides : columella sub- 



