OPEAS, WEST AFRICA. 141 



as henshawi, there is a much more slender, smaller form, 

 which I have received from Honolulu (coll. by Thaanum), 

 and figured on pi. 22, fig. 9. It has the typical sculpture of 

 dense sharp striae, which bear, when quite unworn, cuticular 

 lamina. Length of figured specimen 10, diam. 3 mm., whorls 

 fully 8. 



II. West African Species. 



1. Cape Verde promontory, species no. 5. 



2. Islands in the Gulf of Guinea, species no. 6 to 8. 



3. Mainland of tropical W. Africa, species" no. 9 to 14. 

 Bulimus terrulentus Morel., from Gaboon, included in 



Curvella (p. 52) may be an Opeas or Pseudopeas, but the 

 shell is more thick-set than usual in these genera. 



5. 0. HANNENSIS (Rang). PI. 15, fig. 59. 



This little shell is long, conic, thin, transparent, smooth and 

 of a slightly soiled, yellowish tint, darker towards the sum- 

 mit, which is somewhat obtuse. The whorls number 6, are 

 noticeably rounded, and the last is smaller than the others 

 taken together. The aperture is oval and nearly parallel to 

 the axis in plane and direction. The columella is straight, 

 and is continuous, without truncation, with the outer margin, 

 which is sharp and simple. The animal is of a beautiful yel- 

 low color, visible by transparence through the shell. Length 

 4 to 5, diam. 1.5 to 2 mm. (Rang}. 



West Africa : village of Hann, Cape Verde peninsula, close 

 to fresh water, particularly that collecting about barrels 

 sunken in the earth (Rang). 



Helix hannensis RANG, Ann. Sci. Nat. xxiv, p. 41, pi. 3, f. 8 

 (1831). Bulimus h., PFR., Monogr. ii, 160. Cf. MORELET, 

 Journ. de Conch. 1873, p. 239, and WOLLASTON, Testacea 

 Atlantica, p. 510. 



This species in the original locality seems to have remained 

 unknown to subsequent naturalists. It has been reported 

 by Morelet from the Cape Verde Is.; and Wollaston, who 

 identified the island form with Opeas goodalli, reduces han- 

 nensis to a synonym of that form. Whether this course was 



