ACHATINA. 293 



1. ACHATINA GRACILLIMA, Pfeiffer. 



Plate LIU. Figure 3. 



T. imperforata, subulifortni, tenui, albida, costulis remotis, 

 longitudinalibus acutis ornatai^ spira ad apicem obtusa, an- 

 fractibus ad octo planulatis, sutura profunda discretis, ultimo 

 subangulato ; apertura sub-rhombea, ad basim sub-canalicu- 

 lata ; labro simplici, incumbente ; columella recta. 



SYNONYMS AND KEFERENCES. 



Achatina graciUima, Pfeiffer, in Wiegm. Archiv, 1839, I. 352. 

 Bulimics gracillimus, Pfeiffer, Symbola;, III. 54. 



Monog. Helic. Viv., II. 160. 

 Achatina striato-costata, D'Orb., Moll. Cub. I., 176, pi. 11, f. 19-21. 



DESCRIPTION. 



Shell minute, elongated, very slender, thin, of a 

 drab-white color, ornamented with elevated, compressed, 

 sharp, rather distant, longitudinal ribs, of which there 

 are from twenty to thirty on each whorl. The spire is 

 obtuse at the apex, and composed of about eight flattish 

 whorls, the las_t of which is about one-fourth the length 

 of the shell, and somewhat angular below the middle ; 

 suture deeply impressed. Aperture small, elongated, 

 rhomboidal-ovate ; the lip is sharp, and somewhat pressed 

 inward, so as to be parallel to the axis ; the columella 

 is straight, and joins the lip at an angle, so as almost to 

 form a notch at the base of the aperture. 



Length of axis three-tenths of an inch ; diameter one- 

 fifteenth of an inch. 



Geographical Distribution. Inhabits East Florida 

 VOL. II. 74 



