263 Costa Rico Miocene — Olsson 91 



ly related if not ideutical form, was collected b}* lis from the 

 Pleistocene at Almirante, Panama, and several broken specimens 

 from the beaches at Bocas del Toro, Panama, and from Manzan- 

 illa, C. R. This recent Atlantic form differs only from the typ- 

 ical West Coast testacea in being somewhat more slender and ap- 

 parentl}^ differently colored. 



Tryon in the Manual of Conchology unites testacea with 

 hiat2ila Gmelin from West Africa. 



Gatun Stage: Banajia River, Coll. f, <5, of Red Cliff 

 Creek, C. R. 



Oliva mancineiia, n. sp. Plate 7, figures 8, 9 



Shell slender and more delicate than the preceding; spire 

 long and pointed and about 1-3 of the total length of the shell; 5 

 whorls; sutures deep; the spire-whorls have their lower half 

 thickened by a smooth, encircling band of callus; aperture broad- 

 est about the lower half; inner lip smooth above, with only a 

 small and weak callus at its junction with the outer lip; the out- 

 er lip carries below, 3 or 4 heavy and very oblique plaite; the 

 outer lip is smooth and sharp. 



Iyength48, diameter 11 mm. 



This species differs from O. testacea and its variety costaricen- 

 sis by its much more slender and delicate shell. The porpor- 

 tions of the spire are about 1-3 of the total length of the shell. 



Gaticn Stage: Coll. /, East Grape Point, Creek, C. R. 



Genus OLIVELLA Swainson 



A. Shell large, length 20 mm. or more; spire long and about 

 Yo the total length of the shell. 



OUvella goliath, n. sp. 

 AA. Shell smaller; spire long or short, usuall}^ less than 5^ 

 of the total length. 



B. Shell short and stubby, spire rather short, 



