GEOLOGY AND PALEONTOLOGY OF THE CANAL ZONE. 



557 



The echinoid, Clypeaster gatuni Jackson, is worth a special note. 

 The holotype is from the Gatun formation, station 5662, but two 

 specimens were also collected at station 6237, in limestone referred 

 by Doctor MacDonald to the Emperador limestone, in a swamp 

 north of Ancon Hill and about 4 miles south of Diablo Ridge. This 

 species extended from the Atlantic to the Pacific side of the Isthmus. 



Doctor MacDonald and I obtained at station No. 6019<7 two poor 

 crushed specimens of a gastropod that belongs to the genus Orthaulax. 



A few remarks should be made on the reference of the limestone 

 exposed at station 6021 near the old Caimito switch, to Emperador 

 limestone. Only two identifiable species, LitJiothammium isthmi 

 and Lepidocyclina vaughani, were obtained at this place, but both 

 were found elsewhere in the Emperador limestone. Liihothammium 

 isthmi was also collected on Rio Agua Salud, station 6024&, in 

 association with a coral fauna very nearly the same as that at the 

 type locality of the formation; and Lepidocyclina vaughani was 

 obtained in the Emperador limestone near Miraflores. 



FOSSILS FROM THE EMPERADOR LIMESTONE. 





6015, 

 6016 



6017 



5866&, 

 6019(7, 

 6671 



6021, 



6673 



60245 



6255 



6256 



PLANTAE. 









X 



X 







FORAMINIFERA. 



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 X 



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X 





X 





Hetcrosteginoides sp., apparently H. panamens is Cushman 



X 

 X 



X 

 X 



X 

 X 

 X 



X 





















MADREPORARIA. 









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X 

 X 

 X 

 X 

 X 



X 









X 

































































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X 









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 X 

 X 

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 X 

 X 

 X 

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 X 





















































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