186 TRICHODINA. 



ing, subobsolete on the last whorl, which is merely irregularly 

 striate, with coarse arcuate folds below the suture. Last 

 whorl angular at the periphery. Aperture oblique, acumin- 

 ate-ovate; outer lip thin and acute; columella very concave, 

 abruptly truncate below. Length 21, diam. 9 mm. ; aperture 

 9 mm. long. 



West Africa: Liberia (?). 



This snail is similar to T. clavus except for its very much 

 coarser, stronger sculpture. The authority for the locality 

 on the label is unknown. 



5. T. PAXILLUS (Reeve). PL 56. fig. 12. 



Shell subulate, subfusiform, rather solid, obliquely min- 

 utely striated, whitish, covered with a thin corneous buff- 

 olivaceous cuticle. Spire convex-turrited, the apex acute. 

 Whorls 9, the upper flat, the rest more convex, the last 

 scarcely one-third the total length, rounded basally. Colu- 

 mella subvertical, callous, twisted. Aperture oblique, ellip- 

 tical-oval ; peristome simple, unexpanded, acute. Length 

 27, diam. 9 mm.; aperture 9 mm. long. 4.5 wide (Pfr.). 



Habitat unknown (Mus. Cuming) . 



Achatina paxillus REEVE, Conch. Icon, v, pi. 16, f. 78 (May, 

 1849.) PFR., Monogr. iii, p. 498. 



"This is rather a stout shell, peculiarly rounded at the 

 base. In other respects it approaches very closely to 

 A. clavus" (Eve.). It may prove to be a variety of clavus. 



6. T. MONTICOLA (Morelet). PI. 56, figs. 4, 5, 6, 7, 8. 

 Shell elongate-turrite, thin, very glossy, longitudinally pli- 

 cate costulate, covered with a straw-colored cuticle. Spire 

 lengthened, the apex somewhat obtuse; suture impressed, 

 crenulated by the prominent riblets. Whorls 8 to 8 l / 2 , but 

 slightly convex, the last a little ventricose, obscurely .angular 

 below the middle, slightly exceeding one-third the total length. 

 Columella somewhat twisted, obliquely truncate, not reaching 

 to the base. Aperture semioval ; peristome unexpanded, sim- 

 ple and thin. Length 17, diam. 6 mm. (Morelet). 



Island of S. Thome: in moss on the higher points (Wel- 

 witsch) . 



