GEOLOGY AND PALEONTOLOGY OF THE CANAL ZONE. 125 



Station 6019b. — Panama Canal Zone. Las Cascadas section, Gail- 

 lard Cut. Four feet of dark, stratified tuff and clay immediately 

 overlying the lower limestone bed. Culebra formation (upper part). 

 Oligocene series. Collectors, D. F. MacDonald and T. W. Vaughan ; 

 1911. Callianassa scotti Brown and Pilsbry. Callinectes, species, 

 Panopeus, species. 



Specimen in Museum, Academy of Natural Sciences, Philadel- 

 phia. — Costa Kica. Probably Culebra formation. Oligocene series; 

 labeled " Miocene." Collector, W. M. Gabb. Callianassa scotti 

 Brown and Pilsbry. 



Station 6019c. — Panama Canal Zone. Las Cascadas section, Gail- 

 lard Cut. Lower part of lime-cemented soft gray to olive-colored 

 limestone, with central parting of dark clay. The first hard, limy 

 sandstone bed above the lower limestone and just above 60195. 

 Culebra formation (upper part). Oligocene series. Collectors, 

 D. F. MacDonald and T. W. Vaughan ; 1911. Callianassa vaugliani 

 Rathbun (probably). Callianassa f, species. Hepatus, species. 



Station 6019e. — Panama Canal Zone. Las Cascadas section, Gail- 

 lard Cut. Third hard sandstone bed from bottom. Culebra forma- 

 tion (upper part). Oligocene series. Collectors, D. F. MacDonald 

 and T. W. Vaughan ; 1911. Callianassa stridens Rathbun. 



Station 6012c. — Panama Canal Zone. Gaillard Cut. Top part of 

 limy sandstone below upper conglomerate, near foot of stairs. 

 Culebra formation (upper part). Oligocene series. Collectors, 

 D. F. MacDonald and T. W. Vaughan; 1911. Natantia, family, 

 genus, and species indeterminable. Callianassa, species. Callinectes, 

 species. Euryplax culebrensis Rathbun. 



Station 6020a. — Panama Canal Zone. Las Cascadas section, 

 Gaillard Cut. Lowest fossiliferous bed. Third bed below lowest 

 limestone beds separated by rows of nodules. Culebra formation 

 (lower part of upper half). Oligocene series. Collectors, D. F. 

 MacDonald and T. W. Vaughan; 1911. Balanus (Hesperiba- 

 lanusf), sp. Axius reticulatus Rathbun. Callianassa ovalis Rath- 

 bun. Callianassa elongata Rathbun. Callianassa crassimana Rath- 

 bun. Callianassa spinulosa Rathbun. Callianassa quadrata Rath- 

 bun. Callianassa abbreviata Rathbun. Callianassa magna Rath- 

 bun. Goniochele f arinata Rathbun. Calappella quadrispina Rath- 

 bun. Callinectes reticulatus Rathbun. Thaumastoplax prima Rath- 

 bun. Brachyrhyncha, family, genus, and two species indeterminable. 



Station 6025. — Panama Canal Zone. About 200 yards south of 

 southern end of switch at Bohio Ridge station, relocated line Panama 

 Railroad. Foraminiferal marl and coarse sandstone. Culebra for- 

 mation (upper part). Oligocene series. Collectors, D. F. Mac- 

 Donald and T. W. Vaughan; 1911. Carpilius, species. 



