348 OBELISCUS. 



Conchyl. Cab. p. 344, pi. 37, f. 25, 26; pi. 43, f. 5, 6 (var.) ; 

 Monogr. iii, p. 500; vi. 190. Spiraxis (Euspiraxis) dunkeri 

 Pfr., BINNEY, Ann. N. Y. Acad. Sci. i, p. 355, pi. 15, f. N 

 (teeth) ; Ann. N. Y. Aead. Sci. iii, p. 82, pi. 17, f. K (teeth). 

 Spiraxis d., CROSSE, Journ. de Conch. 1891, p. 151. 



The very glossy shell is finely, faintly striatulate, with a 

 smooth, rounded apex. It is pale yellow, the earlier whorls 

 paler and corneous, the last whorl indistinctly streaked with 

 darker yellow or tawny. The specimens originally described 

 by Pfeiffer were rather small (fig. 1). Larger ones from 

 Salle before me, bearing Pfeiffer's label, measure: Length 

 30, diam. 8 to 8.3, aperture 9.8 mm., whorls 9 to 9 1 / 4 ; diameter 

 at second whorl 1.7 mm. 



Two of a series from Pto. Plata measure : 



Length 32, diam. 7.8, aperture 9.3 mm., whorls lO 1 /^. 



Length 27.7. diam. 7.5, aperture 9 mm., whorls 9y 2 . 



The largest individual before me is one taken by W. M. 

 Gabb, length 38, diam. 9. aperture 11 mm., with' 10% whorls 

 (pi. 5, fig. 2). 



Pfeiffer also described and figured a larger 'chestnut-'Colored 

 varietjr with pale base, length 38, diam. 8 mm., from the 

 Cuming collection (fig. 3). 



2. 0. TURRITELLATUS (Deshayes). PI. 5, fig's. 4, 5. 



Shell turriculate, elongate, narrow at the base, slightly 

 obtuse at the summit, white without markings, smooth, pol- 

 ished, glossy. The spire is formed of 10 slightly convex 

 whorls, the suture is but little impressed and simple. The 

 aperture is very small, a little longer than wide, slightly 

 more than one-fourth the length of the shell. The columella 

 is strongly oblique, recurved in the middle and excised at 

 the base, but obliquely and not so deeply as the majority of 

 the species [of Achatina]. The right lip is simple, thin and 

 acute, a little effuse at base. Length 33, diam. 9, aperture 

 9 mm. 



Habitat unknown. 



Achatina turritellata DESH., Encycl. Meth. ii, p. 11 (1830) ; 

 Fer., Histoire ii, pt. 2, p. 167, pi. 134, f. 17, 18. PFR.. 



