WEST AFRICAN GLESSULA. 107 



obliquely truncate. Aperture oblique, acuminate-oval, pearly 

 within; peristome simple, acute. Length 17, diam. 6 mm. 

 (Pfr.). 



Habitat unknown (Cuming coll.). High on the serra de 

 Pedras de Guinga, under stones, at an elevation of 3000 ft., 

 district of Pungo-Andongo, Angola (Welwitsch). "For- 

 careach, Senegambia" (A. N. S. Coll.). 



Achatina lavigata PFR., P. Z. S., 1854, p. 294; Monogr. 

 iv, 607 ; Novit. Conch, i, p. 32, no. 54, pi. 8, f . 6, 7. MORELET, 

 Voy. Welwitsch, p. 77. Glessula lavigata, PFR., Nomencl. p. 

 330. Homorus I, KOBELT, C. Cab. p. 110. 



Morelet, who was the first to record a locality for this 

 species, thinks that it must originally have been found nearer 

 the coast, as it is unlikely that any earlier traveler had 

 visited the remote solitudes where Dr. Welwitsch found it. 



The whorls are smooth except for weak growth-striae, and 

 are parted by a linear suture which is transparent-margined 

 below. The fifth whorl appears disproportionately wide. 

 The spire tapers rapidly near the obtuse apex, but much more 

 slowly throughout the greater part of its length. The ex- 

 cision at the base of the columella is not very deep. Ex- 

 amples measure: 



Length 17.5, diam. 6, aperture 6.2 mm.; whorls 



Length 17, diam. 6.3, aperture 6 mm.; whorls 



Length 16.5, diam. 5.7, aperture 6 mm.; whorls 



88. G. HYALINA (Rang). PL 14, fig. 16. 



Shell long-oval, smooth, glossy, very thin, transparent and 

 of a pale yellow tint, like horn. The spire is quite elevated 

 and obtuse, composed of 6 slightly rounded whorls, the last 

 one larger than all the others. Aperture oval, rather long, 

 its plane parallel to the axis. The columella has a projecting 

 lobe ; its edge is a little reflexed. Right margin unexpanded 

 and thin, simple and 'Continuous with the columella. Length 

 7 to 9, diam. 3 to 4 mm. (Rang) . 



Liberia: Mesurade, in crevices of rocks at the foot of the 

 cape not far from the sea (Rang). 



Helix hyalina RANG, Ann. Sci. Nat., Zool., xxiv, 1831, p. 



