^35 



Costa Rica Miocene — Olsson 



63 



Gatun Stage: Mt. Hope, C. Z. 



Banana River, Port Limo?t. 

 Boras. 



Drillia cf. moensis, Gabb 



Drillia moensis, Gabb, 1S81, Jour. Acad. Nat. Sci. Phila., vol. 8, 2nd 

 series, p. 351, pi. 46, fi*.';. 33, 



x\ single small speimen of a Drillia was collected from the 

 coral limestones near Limon, which agrees partly with Gabb's 

 figure and description. Our specimen has 7 instead of 8 ribs, 

 and lacks the sutiiral spiral mentioned b}^ Gabb. The dimen- 

 sions of this shell are: Length 12.5, diameter 4.5, last whorl 

 7 mm. 



Gatun Stage: Port Lin 1071. 



OriJiia papaya, n. sp. Plate 4, figure 5 



Shell of medium size, slender and subfusiform; whorls 10 

 (mucleus eroded) ; anal fascicle, a deep concave zone, occup3dng 

 about 1-3 of a whorl interval and bordered above by a small su- 

 taral cord; sculpture of heavy, knob-like ribs, crossed by spiral 

 threads of different strengths; axial ribs about 6 on the last 

 whorl, lacking from the fascicle and from the base and anterior 

 canal; spiral sculpture of primary secondary and tertiar}' threads, 

 there being about four primary threads on each spire-whorl, 

 on the last whorl there are 8 or more primary threads, with an 

 interm.ediate secondary and finer tertiar}^ threads on each side; 

 the anterior canal has numerous threads of varying strength; 

 aperture long and subelliptical; anterior canal long and slightly 

 bent backwards; anal sinus as indicated by the growth lines is 

 deep and wide. 



Length 32, diameter 10, last whorl 19 mm. 



A single specimen Vv^as collected from certain sandstones of 

 Lower Gatun age from a small tributary stream of the Rio 

 Codes near Old Harbor, C. R. The recent Drillia- haliostrephis 

 Dall from the Gulf of Mexico appears closely related, but the fos- 



