SUBULINA, WEST AFRICA. 79 



liquely truncate. Aperture oval. Length 14, diam. 4, aper- 

 ture 3.5 x 2 nun. (Dohrn). 



Prince Island, common on the roots of trees and at the 

 bases of walls, (Dohrn). Cameroons at Bonjongo, (Buch- 

 holz) , and many other localities, common and generally dif- 

 fused (d'Ailly). 



Stenogyra (Subulina) angustior DOHRN, Malak. Bl. xiii, 

 1866, p. 127. MARTENS, Monatsber. Akad. Wiss. Berlin, 1876, 

 p. 262, pi. 3 f. 14, 15. Achatina a., PFR., Monogr. vi, 236. 

 A. striatella PFR., Monogr. ii, 263; Conchyl. Cab. p. 341, pi. 

 37, f . 17, 18 ; in Philippi, Abbild. ii, p. 216, pi. 1, f . 7. 



Subulina a., GIRARD Jornal de Sci. etc. Lisboa, 1893, p. 103. 

 d'AiLLY, Moll. terr. et d'eau douce de Kameroun, Bihang 

 K. Sv. Yet.-Akad. Handl. xxii, p. 111. 



"In both angustior and striatella the columella may be 

 either more or less obliquely truncate, sometimes almost ver- 

 tical, slight modifications consequently taking place in the 

 shape of the mouth " (Dohrn). 



Von Martens has figured a specimen from Bonjongo 

 Kamerun, his figures being copied on pi. 11, fig. 101. He 

 notes that the largest specimens are 23 mm. long, 5 wide, the 

 aperture somewhat less than one-fourth the length, whorls 

 9 to 10, the two upper ones globose and smooth, the striation 

 of the others finer than in Homorus pileatus ; columellar mar- 

 gin strongly arcuate. The visible part of the third and fourth 

 whorls from the base is almost as high as wide. 



The flatness of the whorls is one of the principal distinc- 

 tive features of the species, but is subject to some variation. 

 In Pfeiffer's figures referred by Dohrn to his species (my pi. 

 11, figs. 96) they are much less flattened than shown in von 

 Martens' figures of Kamerun specimens. 



In Prince Island shells before me the whorls are moder- 

 ately convex (pi. 11, figs. 98, 99, 100). The striation is 

 weaker and less regular than in 8. striatella. The specimen 

 figured measures, alt. 14.7, diam. 3.9, aperture 3.7 mm., and 

 has 8^/2 whorls. 



Many shells before me from Senegal and Liberia agree with 

 angustior in sculpture but reach a larger size than Dohrn 's 



