138 Bulletin 39 310 



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

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

 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 slightl)^ 

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

 coarsety sculptured with large, irregular, but narrow spirals 

 bands separated by deep interspaces which may in addition carrj^ 

 one or m.ore 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 Sconsia, were noted by us at several 

 places which we 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 strikingly develop- 

 ed on bocasensis. 



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



