Bulletin 39 



286 



from Jackson Bluff and Coe's Mill, Florida. Ball's figure in the 

 Wagner Free Institute, is so like our shell from western Panama 

 and Costa Rica, that there can be but little doubt of their close 

 affinities. 



The present shell is larger than the kS*. Dalli, of the Canal 

 Zone, with more numerous, obtuse and not sharp ribs, and with 

 a wider and deeper umbilical pit. A canal is developed at the 

 posterior angle of the aperture as in the recent 5". pallida Brod. 

 while in ^. Dalli^ the posterior portion of the aperture is round- 

 ed and there is no canal. 



Gatu7i Stage: Toro and Water Cay, Panama. 



Hill la, Banana River, C. R. 



Soienosteira chiriquiensis, n. sp. Plate 8, figure 3 



Shell large, heavy; spire about ^ the height of the shell; 

 whorls about 7, strongly angled about the middle and carrying 

 heavy knob-like ribs, crossed by heavy spiral cords; the last 

 whorl has 8 ribs which are developed only on the middle of the 

 shell, being lacking from the upper slope and from the base of 

 the last whorl; the tops of the ribs are crossed by 2 strong, spiral 

 cords with a wide, trough-like interval between; above the 2 

 principal spiral cords, there are 4 smaller cords on the upper 

 slope and on the base and canal 10 or 11 ; base of the last whorl 

 contracted to form the straight canal which carries a deep, narrow 

 umbilius; aperture subelliptical. 



Height 57, diameter 34, aperture 34 mm. 



It is possible that this species belong to the genus Cyniia 

 rather than Sole?iosteira, but its aperture is so completely filled 

 with a hard sandstone matrix that the presence or absence of a 

 columellar fold cannot be determined. Its sculpture however is 

 more like Soienosteira than Cymia. The species will be recog- 

 nized by its large size and characteristic sculpture, 



Gatu7i Stage: Water Cay. 



