138 



Bulletin 39 



tical, widest about the anterior 1-3; outer lip thickened and with 

 about 18, fine, lirse-like denticles ; the inner lip with athinspred- 

 ing callus and with about 16 long, narrow rugations. 



Length 35 (last 2 whorls only) diameter 25 mm. 



Differs from the variety Gabbi of laevigata by its more narrow 

 shell, coarser sculpture and larger aperture. The suture is bord- 

 ered by a cord-like ridge. 



Gatun Stage: Bocas del Toro. 



Sconsia cocleana, n. sp. Plate 12, figure 7 



Shell globose; spire low of about 7 whorls, the apex slightlj^ 

 projecting; sutures distinct and deep, but not appressed; surface 

 coarsely sculptured with large, irregular, but narrow spirals 

 bands separated b}^ deep interspaces which may in addition carry 

 one or more finer spiral threads; there are 7 or 8 spirals on each 

 spire whorl; on the last whorl the spirals are nearly twice as wide 

 as the upper third of the whorl and more anteriorly; no varices; 

 the outer lip is broken from the single specimen; inner lip is a 

 wide but thin wash of callus, without rugations or denticles of 

 any sort. 



Length 46, diameter 32 mm. 



The Uscari shales which everywhere in Costa Rica appear to 

 underlie the Gatun sandstones is very rich in the smaller types 

 of foraminifera, but mollusks are rare, fragmentary and difficult 

 to collect. Fragments of Sco7isia, were noted by us at several 

 places which v/e believe belong to this species or to the bocas- 

 ensis. 



This species will be recognized by its broad, globose shell 

 and small spire. It lacks the sutural cord so strikingh^ develop- 

 ed on bocasejisis. 



Uscari Stage: Rio Codes near Old Harbor, C. R. 



