SUBULINA, WEST AFRICA. 81 



truncate. The aperture occupies at least one-fourth the total 

 length of the shell." (P/V.). 



Achatina sulcata Gray (pi. 11, fig. 93). "Shell turrited, 

 pellucid, corneous, the apex obtuse; whorls 8 to 9, convex, 

 concentrically sulcate in the middle, at the base smooth; lip 

 thin. Length .7, diam. .2 inch" (Gray}. Habitat not given. 



Achatina sulcata GRAY, Annals of Philos., N. Ser., ix, p. 

 415 (1825). --REEVE, Conch. Icon, v, pi. 17, f. 86.--PFR., 

 Monogr. ii, p. 267 ; iii, p. 500 ; iv, 615 ; vi, 235. 



Reeve's figure of a Cumingian specimen is copied. Pfeiffer 

 in the later volumes of the Monographia considered A. vivip- 

 ara Sowerby a synonym of sulcata. The latter name has 

 priority, but is hardly defined with sufficient precision, and 

 the type specimen has not been figured. 



8. S. TOTISTRIATA n. sp. PI. 13, figs. 17, 18, 19. 



Shell thin but strong, imperforate, turrited-subulate, cor- 

 neous-white, somewhat translucent, glossy; strongly, densely 

 and finely but a little irregularly striate throughout. Whorls 

 10, convex, separated by a deeply impressed suture, which is 

 irregularly, rather coarsely but not conspicuously crenate in 

 places. Spire regularly tapering to the obtuse apex. The 

 first half whorl is smooth, the next with coarser, more spaced 

 riblets than those on subsequent whorls. The last whorl has 

 a very weak angle at the periphery, often hardly noticeable, 

 were it not that the stride abruptly become weak there, leaving 

 the base much smoother. Aperture quite oblique, less than 

 one-fourth the length of the shell, ovate; columella concave, 

 obliquely truncate below. Eggs yellowish, spheroidal. 

 Length 16, diam. 3.8, length of aperture 3.75 mm. 



Senegambia. Coll. A. N. S. Phila. 



This species differs from others of the group by its sculp- 

 tured embryonic shell, like that of Pseudoglessula. In the 

 latter genus the color of the shell is darker, the eggs oblong, 

 and the peripheral angle is generally more emphatic than in 

 this species; but some species such as P. duseni and P. fus- 

 cidula do not exceed the size of S. totistriata. 



