40 ACHATINA, EAST AFRICA. 



pears to be the normal color of the shell. It differs from 

 A. craveni Smith in wanting flammules and in sculpture. 

 From A. reticulata it differs in being unicolored, shorter, 

 more strongly conic, and of greatly inferior size. A. marioni 

 has coarse granulation on the last three whorls, but on the 

 lower part of the penultimate whorl this sculpture disap- 

 pears, or at least is very lightly marked. It is also trans- 

 formed below the middle of the last whorl into a sculpture 

 similar but much finer, the granules becoming less distinct. 

 This transformation is quite abrupt. The penultimate whorl 

 of A. marioni has a tendency to become strongly swollen. 

 The shell is calcareous and very thick, and the columellar 

 truncation is very strong and oblique. Description and notes 

 from Ancey. 



39. A. ACUTA Lamarck. 



Shell ovate-conic, elongate, the apex acute; very delicately 

 decussate; white with longitudinal red-chestnut flames, close 

 and somewhat widened below, separated above; aperture 

 white. A beautiful shell, quite distinct in shape, and brightly 

 colored. Length 5 inches (Lam.). 



Sierra Leone (coll. Lamarck). 



A. acuta LAM., An. s. Vert., vi, pt. 2, p. 129, no. 5 (April, 

 1822). cf. PPB., Monogr., ii, 251; DESK, in Fer., Hist., ii, 

 p. 158, pi. 124 A, f. 2; and REEVE, Conch. Icon., v, pi. 3, f. 11. 



Under the name Helix acuta, Ferussac figured a worn 

 specimen of a form of A. panther a, in which the broadly 

 streaked pattern is much interrupted by short, spirally- 

 elongate blotches. The mouth and columella are white. The 

 figure measures, length 121, diam. 55, alt. aperture 60 mm. 

 This is sufficiently near the dimensions given by Lamarck to 

 lend some color to the supposition that Ferussac figured 

 Lamarck's type; but the brevity of the original description 

 does not permit certain identification, which awaits examina- 

 tion of the type. 



An gas has reported A. acuta from Ekongo, on the south- 

 east coast of Madagascar (P. Z. S., 1877, 527). 



