i74 Bulletin 29 338 



Area grandis Gabb (in part), Jour. Acad. Nat. Sci. Phila., vol. 8, sec. 

 ser., p. 378, 1874-1881. 



Area patricia Dall, Trans. Wagner Inst. Sci., vol. 3, pt. 4, pp. 642, 

 658, 1898. 



Area patricia Sheldon, Palaeontographica Americana, vol. 1, p. 49, 

 1916. 



This shell is exceedingly close to the West Coast A. grandis. 

 Sowerby's distinctions hold only for individual specimens. Gabb 

 confused the smaller related species, A. ckiriquiensis, with the 

 young of A. patricia. No one has recognized both these species. 

 Sowerby had the larger (A. patricia) and Dall had the smaller 

 (A. ckiriquiensis) , while Gabb had both, but thought them the 

 same. This has been clearly elucidated by Dr. Sheldon. Guppy 

 reported A. patricia from the Caroni Series, Trinidad. This great 

 Ark has never heretofore been figured. 



Localities. — (Exp'd' 16) hi situ, 1st, 2d and 3d Arcapatri- 

 cia beds, Caimito, Rio Cana (see section); loose at Sabaneta, and 

 very abundant in the lower reaches of the Rio Cana at the cross- 

 ing of the Mao to Guayubin road. 



Scapharca ckiriquiensis Gabb 

 Plate 28,- Figure 2 



Area chiriquie?isis Gabb, Proc. Acad. Nat. Sci. Phila., vol. 12, p. 567, 



1861; 

 Area grandis Gabb (in part) Jour. Acad. Nat. Sci. Phila., vol. 8, p. 



378, 1874-1881. Exclude A. patricia and A. grandis. 

 Scapharca (Scapharca) ckiriquiensis Dall, Trans. Wagner Inst. Sci., 



vol. 3, pt. 4, p. 642-643, 1898. 

 Area ckiriquiensis Sheldon, Palaeontographica Americana, vol. 1, p. 49, 



1916. 



The Floridian shell, A. staminata Dall has a superficial re- 

 semblance to A. ckiriquiensis but the real relationship of the Do- 

 minican fossil is with A. patricia and the latter' s descendant, A. 

 grandis. . Area ckiriquiensis has been reported by Dall from the 

 Oligocene of Chiriqui, Central America, and from an island in 

 Lake Henriquillo, southern Santo Domingo. 



Locality. — (Exp'd '16) Sabaneta to Guayubin road (Abund- 

 ant and in situ). 



