69 American East Coast Arcas 69 



.■l/ra {A'oi-//a) ^/acdona/cii DaW, 1. c, p. 9. 



Arra {Scaphaira) Pitticri Dall, 1. c, p. 9. These last two species are from Costa 

 Rica and may be older than limonica. 



Area (AWt/a) slu/doniana Maury, Acad. Nat. Sci. Phila., Journ., 2d. ser., vol. 15, 

 p. 43, pi. 8, figs. 10, II, 1912, from the Oligocene of Trinidad. 



Area (Cunearea) ehcmnitzioides Maury, 1. c, p. 44, pi. 7, figs. 13, 14, 15, pi. 8, fig. i, 

 from the Oligocene of Trinidad. 



Area {Argina') billingsiana Maurj-, 1. c, p. 45, pi. 8, figs. 2, 3, from the Oligocene 

 of Trinidad. 



Area (Argina) sehiiltzaiia Maury, 1. c, p. 46.pl. 7, figs. 10, 11, 12, recent from 

 Trinidad. 



Area (Argiita) brightonensis Maury, 1. c, p. 46, pi. 8, figs. 4, 5 ,6, from the Oligocene 

 of Trinidad. 



Area {Argina) pariaensis Maury, 1. c, p. 47, pi. 8, figs. 7, 8, 9, recent from Trini- 

 dad. 



Area sp. indet. Maury, 1. c, p. 47, pi. 7, fig. 16, from the Oligocene of Trinidad. 



Area sp. indet. Maury, 1. c, p. 47, from the Oligocene of Trinidad. 



Area dalUBvown and Pilsbry, Acad. Nat. Sci. Phila., Proc. , vol. 64, p. 510, pi. 24, 

 fig. 4, 1 91 3, from the Oligocene of the Isthmus of Panama. This is not Area {Macrodon) 

 dalli E. A. Smith, (Challenger Rept. Lam., p. 269, pi. 17, figs. lo-iob, 1885). The 

 Panama species might be called Area Balboai. 



Area giammatodonta Dall, U. S. Nat. Mus., Bull. 90, p. 118, pi. 20, figs, i, 2, pi. 

 22, fig. 3, 1915, from the Oligocene of the Tampa silex beds at Ballast Point, Tampa 

 Bay, Florida. This species belongs to the True Arks. 



Area {Barbatia) «a«(/i Gardner, Maryland Geol. Surv., Upper Cretaceous, pp. 96, 

 535. 539. 917. pl- 21. figs. 5, 6, 1916, from the Cretaceous of. Delaware. 



Nemodon Sta?ihnii Gardner, 1. c, pp. 94, 525, 527, 915, pl. 19, fig. 15, from the Cre- 

 taceous of Maryland. 



Nemodon eceilius Gardner, 1. c, pp. 94, 525, 528, 916, pl. 20, figs. 5-7, from the Cre- 

 taceous of I\Iar\'land. 



Area (Scapharea) sfaminea Say, subspecies rubishiiana Mansfield, U. S. Nat. Mus., 

 Proc, vol. 51, p. 603, pl. 113, figs. I, 3, ID, 1 9 16. 



The Zoological Record lists the following species: Area {Seap/iarea) ehavesi, Mexico 

 Miocene, Engerrand and Urbina, "Primera nota acerca de la Fauna Miocenica de Zulu- 

 zum (Chiapas). Mexico Bol. Soc. Geol. Mex. 6 1910 (119-140)." 



Notes on N'oi-tia. — It has been stated, (p. 25), that the known fossils are all Ameri- 

 can. Area Okeni Mayer, as figured and described by Mayer, (Journ. de Conch., t. 6, p. 

 185, pl. 14, figs. 7, 8, 1857), and Dollfus and Dautzenberg, (Mem. Soc. Geol. France, 

 Paleont.j t. 20, Mem. No. 27, p. 337, pl. 27, figs. 19-27, 1913), from the Middle Terti- 

 ary of France and central Europe, is a chacteristic No'ctia. Dollfus and Dautzenberg com- 

 pare it with A. jUariinii Reduz. Mayer compared it with True Arks. This is inter- 

 esting since the subgenus Noclia appears to be more closely related to the Typical Arks 

 than to any other group. Barbatia eafria Bartsch, (U. S. Nat. Mus., Bull. 91, p. 183, 

 pl. 38, figs. I, 5, 1915), recent from Port Alfred, South Africa, is clearly a Nditia also 



