69 



below, chaunelled above. Interior cl ark purple-brown; outer margin 

 very thick, slightly curvecl at the extremities, basal sinus rather 

 uarrow and deep; collumellar margin straight above, much curved 

 below, with about 18 plaits; upper ones coarse and short, fol- 

 iowed by 3 plaits which are much stronger and prominent, and 

 at last by a few very small plaits near the base. 



Alt. 14, Lat. Vj r Apert. alt. 11'/,, Lat. Vj 2 Mill. 



Figures and comparison with allied species will be given in 

 the future publications. 



