20 Paleaontographica Americana 



inner margin not very distinctly crenated: muscular impressions elevated, and forming 

 a broad line each side, from the cavity of the beak to the margin. 



"Length nine-tenths of an inch, breadth nearly one inch and a half. " — Say, 1824. 



Say used the term length for height and breadth for length. 



This species does not closely resemble any other American Area. The beaks are 

 elevated and little curved; the ligament area is transversely striated, each groove cor- 

 responding with a groove in the ligament; the teeth are usually partly dissolved so that 

 they are hollow, as in the fossil Adajnsi; the upper edge of the line of teeth is straight, 

 but the lower edge is evenly arcuate, so that the teeth are very short at the center and 

 increase in length toward the ends of the hinge, where they make an angle of 45 de- 

 grees with the hinge-line; the extreme distal teeth are shorter and nearly horizontal; the 

 inner margin is nearly smooth except in the young. 



Dimensions. — Lon. + i5,-2S; alt.-fs,-24; semidiam. 12 mm. 



Occurrence. — Older Miocene of Jericho, Cumberland County, New Jersey, and in the 

 Virginia Miocene at Coggin's Point, Petersburg, Grove Wharf, on the James River, and 

 the Miocene beds of the York River. — Dall. Clioptank Miocene of Jones Wharf; Cal- 

 vert Miocene of Church Hill, Fairhaven, Maryland. — Glemi. Miocene of Evergreen, 

 James River, Yorktown, Kingsmill, Bellefield and Grove Wharf, Virginia. — C. U. 

 Museum. 



Area reticulata Gmelin 

 Plate IV, Figures 8, 9, 10, 11, 12 



Area reticulata Gmelin, Syst. Nat., 6, p. 3311, 1792. 



Area reticulata Chemnitz, Conch. Cab., 7, p. 193, pi. 54, fig. 540. 



Area squamosa, domingensis et clathrata Lam., An. s. Vert., vol. 6, pp. 45, 40, and 46, 1819. 



Area gradata Brod. and Sbj'., Zool. Journ., vol. 4, p. 365, 1829. 



Area divaricata Sb}'., P. Z. S., 1S33, p. 18; Reeve, Conch. Icon., Area, pi. 16, fig. 108, 1S44. 



Barbalia (Aear) reticulata Dall, Wagner Free Inst. Sci., Trans., vol. 3, pt. 4, p. 629, 1898. 



"A. testa subrhomboidea decussatim striata alba: natibus approximatis, \'ulva cor- 

 data. 



List. Conch, t. 233. f. 67. 



Martini Besch, Berl. Naturf. 3. t. 6. f. 9. 



Chemn. Co7ick. 7. t. 54. f. 540. 



Habitat arcae Noae affinis; 7ttrum /lujns, an segucntis {amiliaeV — Gme/ift, 1792. 



The synonymy is taken from Dall. This includes forms of varietal value. Speci- 

 mens in the Newcomb collection from Panama and Trinidad are radiately and concen- 

 trically ridged, the concentric ridges the stronger on the middle of the shell, gi\ang rise 

 to the naxa.e gradala; the diverging, radiating ridges are about as strong as or stronger 

 than the concentric ridges on the posterior slope, but the sculpture is not conspicuously 

 different on different parts of the shell. Only the posterior part of the cardinal area is 

 covered by the ligament; the inner margin is finely crenulated. A specimen from Cuba 

 is very similar to one labelled Aear donaciformis from the Mediterranean. These are 

 smaller and thicker and the crenulations on the posterior inner margin are not so closely 



