1913. 



NATURAL SCIENCES OF PHILADELPHIA. 



497 



Chione cancellata (L.)- C. 



Tellina {EurytelUna) alter nata Say. C. 



Tellina (Cyclotellina) fausta Don. 



Tellina (Angulus) versicolor Coz. 



Tellina (Angulus) promera Dall. 



Abra cequalis (Say). R. 



Corhula equivalvis Phil. C. 



Corbula swif liana C. B. Ad. C. 



Manicina areolata (L.), 



Porites porites (Pallas). 



Agaricia agaricites (L.). 



Cladocora orhuscula (Le Sueur). 



Siderastrea sidera (Ell. and Sal.). 



Favia jragum (Pallas). 



List of Species obtained from the black mud unconformable 



ON the Gatun Formation at the lOwer end of the 



Gatun Locks.— Collection 2. 



Balanus ehurneus Gould. 



Melongena melongena (L.). 



Cerithidea varicosa Sby. 



Neritina virginea Lam. C. 



Ostrea virginiai Gmel. C. 



Congeria iMijtilopsis) cochleata Kick. C. 



Phacoides pedinatus (Gmel.). C. 



Anomalocardia cuneimeris Con. R. 



Cyrena (Polymesoda) acuta Prime. R. 



Descriptions of new species. 



Terebra spei n. sp. Fig. 1. 



The shell is small, slender, the 

 diameter contained five times 

 in the length. Apex lost, 11^ 

 whorls remaining are slightly 

 convex. Sculpture consists of 

 rather sharp axial ribs, narrower 

 than their concave intervals, 

 curving backward in the middle, 

 on the last whorl 22 in number, 

 and continued as far as the 

 anterior contraction; a spiral 

 groove, equally deep over ribs 

 and intervals, defines a posterior fasciole which is somewhat less than 

 one-third the width of each whorl; below this there are seven spiral 

 cords wider than their interstices, prominent in the concave inter- 



Fig. 1. — Terebra spei n. sp. 



