6i American P)ast Coast Arcas 6i 



.Irca jilicata Guppy; Plate XV, Figure 5; ((juart. Journ. Geol. Soc, vol. 22, p. 583, 

 pi. 26, fig. s, 1S66; Schuchert, U. S. Nat. Mus., Bull., no. 53, p. 56, 1905), from Man- 

 zanilla, Trinidad, evidently belongs to Cunearca. It is small, "rather inequivalve, with 

 about thirty ribs, broader than their interstices, and nodosely crenate, becoming nearly 

 smooth on the disk of the right valve," and the ligament area is wide. Dall (Wagner 

 Free Inst. Sci.. Trans., vol. 3, p. 636) calls the beds in which this occurs Eocene. Sca- 

 pharca {Cunearca) cumaiieiisis Dall, (Wagner Free Inst. Sci., Trans., vol. 3, p. 633, 1S98) 

 from the Oligocene of Cumana, Venezuela, and an island in Lake Henriquillo, St. Do- 

 mingo, is the species listed by Guppy (Geol. Mag., Oct. 1874, p. 443) as A. incoytgrua 

 from Cumana. "Shell small, resembling 5". incongma Say in miniature, but with higher, 

 more prominent, and uncompressed beaks, with the ribs of the posterior slope of the 

 right valve smooth instead of nodulose; the valve higher and shorter, with the beaks 

 more anterior, and the hinge-line somewhat shorter. Lon. of adult shell 26, alt. 25, 

 diam. 21 mm. * * *." — Dall. 



Section Angina (iray 



"Group of ^./fjra/a Say. (Argina (Gra)-, 1840) Adams, 1858.) 



"Thin, ovate-oblong, rounded; beaks prosoccelous, with the right valve smaller, the 

 cardinal area opisthodetic, or nearly so, and very narrow, the hinge-teeth in two series 

 — the anterior shorter, usually irregular or broken up, the posterior longer, normal; the 

 epidermis imbricated and profuse; inhabiting salt water." — Dall, 1898. 



Area campechensis Dillwyn 



Plate X\', Figures 6, 7, 8, 9, 10, 11, 12, 13 



" Pectunailus dense et profundi striatus, ovali Jigurd," Lister, Hist. Conch., tab, 237, 

 fig' 71- 1770; Bay of Campeachy. 



Area No. 22; Schroeter, Eiuleit. Conch., 3, \>. 2.S8, 1786. 



Area campeehciisis Gmel., Syst. Nat., 6, p. 3312, 1792. 



Area ovalis Bruguiere, Enc. Meth., p. no, 1792. 



Area declivis Solander JISS.,y?i/tf Dillwyn, 1817. 



Area eaml>cehensis Dillw}'n, Descr. Cat. Rec. Sh., vol. 1, p. 238, 1817 (Syn. partim exclus. ), Ja- 

 maica and Carolina: not of Wood, Ind. Test., p. 46. pi. 9, fig. 28, 1825. 



Area pcxata Say, Acad. Nat. Sci. Phila., Journ., vol. 2, p. 26S, 1822. 



Area seaplia Ravenel. Cat., p. 5, i'S2,A,Mde Stimpson. 



Not Area seap/ia Lamarck, An. s. Vert., vol.6, p. 42, 1S19; Reeve, Couch. Icon., Area no. 25, 1S44. 



Area aiiierieana (Gray 1 Wood, Index Test. Suppl., pi. 2, Area, fig. i, 1S28; ibid., ed. Hanley, p. 

 205, 1856; Tryon, Am. Mar. Couch., p. 179, pi. 37, fig. 470, 1874. 



Area aiiierieana Reeve, Conch. Icon., Area, fig. 21, 1844; Holmes, Post. -Pi. Kos. S. Car., p. 19, pi. 

 4, figs. 2, 2a, 185S. 



Area pexala Greene, Mass. Cat., 1833; Gould, Rep. Inv. Mass.. p. 95, fig. 60, i84i;Reeve. Conch. 

 Icon., Area, fig. 22, 1844; De Kay, Nat. Hist. N. Y., Moll., p. 176, p. 12, fig. 211, 1843; Tryon, 

 Struct, and Syst. Conch., vol. 3, p. 255, pi. 126, figs. 46, 47, 1884. 



Area eampeehensis Ravenel, Cat. Coll., p. 5, 1834; Arango, Moll. Cubana, p. 262, 1880. 



Area Holiiiesii Stimpson, S. I. Checklist, p. 2, 1S60; Tryon, .\m. Mar. Conch., p. 179, pi. 37, fig. 

 471, 18-4, 



