5?3S Costa Rica Miocene — Olsson 63 



Gatun Stage: Mt. Hope, C. Z. 



Banana River, Port Linion. 

 Boras. 



DriSJJR cf. mcensis, Gabb 



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

 .series, p. 351, p!. 46, fig. 33. 



x'V single small speimen of a Drillia was collected from the 

 coral limestones near Limon, which agrees partl}^ with Gabb's 

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

 and lacks the sutural spiral mentioned hy Gabb. The dimen- 

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

 7 mm. 



Gatun Stage: Port Limo7i. 



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



Shell of medium size, slender and subfusiform; whorls 10 

 (mucleus eroded); anal fascicle, a deep concave zone, occupj'ing 

 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 fasciole and from the base and anterior 

 canal; spiral sculpture of primary secondar}- and tertiary threads, 

 there being about four primar}' threads on each spire-whorl, 

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

 intermediate secondary and finer tertiary threads on each side; 

 the anterior canal has numerous threads of varying strength ; 

 aperture long and subelliptical; anterior canal long and .slightl}' 

 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 was 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 kaliost?'ephis 

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



