108 WEST AFRICAN GLESSULA. 



40, pi. 3, f. 5. Achatina h., DESH., in Lam., An. s. Vert. p. 

 308. PFR., Monogr. ii, p. 258. 



Known to me by the above account only. 



Group of G. paritura (Section Neoglessula, nov.) 



Embryonic whorls very minutely and not closely engraved 

 spirally, successively lengthening vertical grooves appearing 

 on the later ones; whorls of the neanic and adult stages 

 closely, regularly rib-striate, base smoother. Viviparous. 

 Type G. paritura. 



Several species from the northern shores of the Gulf of 

 Guinea form a group having adult sculpture somewhat as 

 in Pseudoglessula, but embryonic sculpture of their own. 

 Only one of these is known to me by specimens; the others 

 are still known by the original lots only. 



89. G. PARITURA (Gould). PI. 14, figs. 17, 18, 19. 



Shell elongate, thin, glossy, pale corneous, longitudinally 

 closely lirate; spire turrite, obtuse at the apex. Whorls 7, 

 convex, the last about half the total length of the shell. 

 Suture deep. Aperture narrow, somewhat ear-shaped. 

 Columella deeply arcuate, involute, forming a basal channel. 

 Length 1, width .35 inch. (Gld.). 



West Africa: near the sea, Fishtown, Liberia, buried un- 

 der leaves or in the earth during the dry season ; also Cape 

 Palmas. 



Achatina paritura GLD., Proc. Bost. Soc. Nat. Hist, iii, 1850, 

 p. 196; Otia Conch, p. 208. PFR., Monogr. iii, 491. PETIT, 

 Journ. de Conchyl. ii, 1851, p. 269, pi. 8, f. 7. Honwrus p., 

 KOBELT, Conchyl. Cab. p. 92. 



This species is viviparous. The summit is semiglobular ; 

 first 11/2 whorls smooth in adults, but in young shells they 

 show sparse engraved spiral lines; then vertical grooves ap- 

 pear below the suture, short and widely spaced at first, but 

 gradually lengthening and becoming 'Closer, so that at the 

 end of 2y 2 whorls they reach nearly to the suture below, and 

 become so close that the sculpture may be described as rib- 



