199 Costa Rico Miocene — Olsson 27 



The Area Henekeni, Glycymeris javiaicensis and Protocardia 

 gurabica occur with a t3'pical Gatun fauna at Water Ca}^ west- 

 ern Panama, associated with Sconsia, and other Gurabo shells. 

 With the exception oi Rijigiada dominicana,\\i^ other species are 

 generally rare. The evidence is therfore stronglj^ in favor of 

 the equivalence of the Gatun beds with the Gurabo of Santo 

 Domingo. 



BowDEN Beds, Jamaica 



Next to Santo Domingo, the highly fossiliferous beds at 

 Bowden, Jamaica, are the best known. From this locality, Dall 

 has listed about 435 species, of which 12 per cent, appear to be 

 identical with recent species. 



Recent correlation by Cooke places the Bowden beds as 

 equivalent to the Gurabo formation of Santo Domingo, and there- 

 fore to the Gatun formation; a correlation which is borne out by 

 our own studies. About 38 Gatun species, not including recent 

 forms, are here considered equivalent to Bowden shells. In gen- 

 eral, the Costa Rican localities which show the closest agree- 

 ment with Bowden, are the upper coralline horizons, so that the 

 Bowden beds may be a little higher than the main Gurabo and 

 they are so considered here. The following Bowden shells oc- 

 cur in the Costa Rican Gatun. 



"^Adeocina bullata Kiener 



'^Acteocina recta d'Orb Petaloconchus sculpturatus Ivea 



^'Volvulacylindrica Gabb Alaba turrita Guppy 



BuUaria paiipercula Sowerby *Crepidtila plana Say 



Terebra bipartita Sowerby *Nrtica near canrena Linne 



Conus planiliratus Sowerby Glycymeris jamaicensis Dall 



Conns stenostonius Sowerby *Arca occidentalis Philippi 



Conus granozonatus Guppy *Arca auriciilata Lamarck 



Conus recognitus Guppy *Ostera inegodon Hanley 



Conus interstinctus Guppy Limcsa solida Dall 



Conus gracilisshnus Guppy Placunanomia lithobleta Dall 



*Turris albida Perry Echinochama antiquata Dall 



* Recent 



