19 



WEST AFEICAIST SNAILS PILSBRY 



weakly convex, less so than in A. purpurea or A. ventricosa. Suture 

 with a rather weakly defined margination. Surface closely granu- 

 lose, the granules in spiral lines and superposed on the irregular 

 axial wrinkles, a little Aveaker below the periphery; on the early 

 whorls similar to those of A. purpurea. The aperture is ovate, pale 

 vinaceous-pink within, somewhat darker within the lip edge. Colu- 

 mella and parietal callus vinaceous, with a darker outer edge. 

 Measurements are as follows: 



Remarks. — The shape is about that of A. rhodostoma (Philippi), 

 but it differs from that by the well-developed granulation of the 

 last whorl, as in A. purpurea and A. ventricosa^ and by the longer 

 aperture, over 68 per cent of the length of shell, while in vliodostoma 

 the aperture occupies about 57 per cent and in A. rhodostoma splen- 

 dida about 59.6 per cent. In A. spectaculum, the aperture is dis- 

 tinctly narrower than in A. rhodostoma., purpurea, or ventricosa. 

 The parietal callus has a dusky edge, not a lighter edge as in A, 

 rhodostoma., in this respect resembling A. purpurea. The interior in 

 A. spectaovlum is decidedly paler than in A. purpuTea and A. ventri- 

 cosa., and the whorls are much less convex than in those species^ 



This species differs so much from others of the purpurea group 

 known to this time ^ that it seems best to call attention to it, even 

 though the locality is unknown. Its relations are with the species of 

 that Liberian group, as it has the sculpture of A. ventricosa and 

 much the shape of A. rhodostoma. 



Genus PSEUDOTROCHUS H. and A. Adams 

 PSEUDOTROCHUS TURBINATUS (Lea) 

 Plate 1, Figures 1, 2 

 Achatuia turhinata Lea, Proc. Amer. Philos. Soc, vol. 2, p. 31, May 7, 1841. 



SpeGime7is.— Type: U.S.N.M. No. 116706, collected by Doctor 

 Blanding in Liberia. No. 151005, collected by R. P. Currie at Mount 

 Coffee, Liberia. 



Description.— The shell is thin, ovate-conic, the outlines only 

 slightly contracted below the summit. The last whorl is opaque white 

 with widely spaced, irregular dark streaks and scattered spots, which 

 are liver-brown on the back, chestnut on the front; the penultimate 



■•'Man. Conch., vol. 17. pp. 113-116. 190.5. 



