GEOLOGY AND PALEONTOLOGY OP THE CANAL ZONE, 



563 



norytis) toroense Dall and of E. toroenses var. insigne Dall. 1 In addition 

 to these identifiable Mollusca, dissociated barnacle plates and com- 

 minuted milluscan shell fragments are abundant. The probably 

 equivalence of this deposit with the coquina rock, which contains 

 many fragments of Pecten sp., on the top of the hill at the west end 

 of Gatun dam, is discussed by Doctor MacDonald on page 544 of his 

 article immediately preceding the present one. 



Pleistocene. 



Although horizons in the marine Pleistocene deposits of America 

 have not yet been discriminated on the basis of their contained fossils, 

 it is my opinion that such discriminations will be made. As a con- 

 tribution toward the biologic characterization of a Pleistocene 

 deposit, the following list of fossils from the deposit in the swamp 

 north and east of Mount Hope, stations Nos. 5850 and 6038, has been 

 prepared. Two papers on the fossil mollusca from this locality have 

 been published. The first is by Dr. W. H. Dall, in his paper just 

 referred to; the second is by Messrs. Brown and Pilsbry. 2 The other 

 lists are from the memoirs forming parts of this volume. 



FOSSaS FROM THE PLEISTOCENE OF THE CANAL ZONE. 



PLANTAE. 



Archaeolithothamnium episporum M. A. 

 Howe. 



MADREPORARIA. 



Oculina diffusa Lamarck. 



varicosa Le Sueur. 

 Eusmilia fastigiata (Pallas). 

 Astrangia (Phyllangia) americana Milne 



Edwards and Haime. 

 Cladocora arbuscula Le Sueur. 

 Solenastrea bournoni Milne Edwards and 



Haime. 

 Faviafragum (Esper). 

 Maeandra areolata (Linnaeus). 

 Manicina gyrosa (Ellis and Solander). 

 Agaricia agaricites (Linnaeus). 



var. purpurea Le Sueur. 

 pusilla Verrill. 

 Siderastrea radians (Pallas). 



siderea (Ellis and Solander). 

 Acropora muricata (Linnaeus.) 

 Porites furcata Lamarck. 



astreoides Lamarck. 



i Dall, W. H., New species of fossil shells from Panama and Costa Rica, Smithsonian Misc. Coll., vol. 59, 

 No. 2, pp. 6, 7, 1912. 



s Brown, A. P., and Pilsbry, H. A., Two collections of Pleistocene fossils from the Isthmus of Panama, 

 lead. Nat. Sci. Phila. Proc. for 1913, pp. 493-500, 1913. 



» The abundance or rarity of the species is indicated by the letters R. (rare) and C (common). 



HYDROZOA. 



Millepora alcicornis Linnaeus. 



MOLLUSCA. 



Tornatina canaliculata (Say). R 

 Cylichnella bidentata (Orbigny.) 

 Atys sandersoni Dall. 

 Bullaria occidentalis (A. Adams). 

 Haminea canalis Dall. 

 Eaminea antillarum (Orbigny). 

 Terebra spei Brown and Pilsbry. 

 Conus proteus Hwass. R. 

 Drillia leucoq/ma Dall. 



ostrearum Stearns. 



harfordiana (Reeve) var. 

 sis Brown and Pilsbry. 

 Clathurella jewetti Stearns. R. 

 Cythara balteata (Reeve). 



biconica (C. B. Adams). 

 Marinula colonia Dall. R. 

 Olivella myrmecoon Dall. C. 

 MargineMa cincta Kiener C. 

 pallida (Linnaeus) 

 minuta Pfeiffer. 



R. 



colonen- 

 R. 



0. 



R. 



