66 Palaeontographica Americana 66 



tocene. It has a thin shell, evenly rounded in front and produced behind with an oblique 

 posterior margin; surface with numerous fine radiating lines; hinge-line short; teeth 

 small, with a gap opposite the beaks; cardinal area wider in front, narrower behind, with 

 a raised margin; posterior part of the cardinal area with several fine, close-set longitu- 

 dinal grooves; inner margin smooth. 



Bathyarca abyssonim Verrill and Bush; Plate XVI, Figure i6; (Verrill and Bush, 

 Proc. U. S. Nat. Mus., vol. 20, p. 843, pi. 76, fig. 9, 1898), was found in 1825 to 1859 

 fathoms, ofT Delaware Bay. A single specimen of a form related to pediinculoidcs, from 

 a depth of 27 fathoms. Gulf of Maine, was named Bathyarca anomala by Verrill and 

 Bush, (Proc. U.S. Nat. Mus., vol. 20, pp. 843, 844, pi. 77, fig. 8, 1898); Plate XVI, 

 Figure 15. It is not Ana aiiomala Reeve, (Conch. Icon., Area no. g, pi. 2, 1843); Area 

 anomala Blake and Hudleston, (Quart. Journ. Geol. Soc. London, vol. 33, p. 398, pi. 15, 

 fig- 7> 1S77); 01" Area anomala d'Eichwald, [Naturhist. Skizze, p. 211, (Lethaea Rossica, 

 vol. 3, p. 78, pi. 4, fig. 12, a, b, c, 1853)]. The Bathyarca might be called Area {Bathy- 

 arca') Vcrrillbushi. 



Area {Scapharea) culebreiisis E. A. Smith; Plate XVI, Figures 17, 18, 19; (Challenger 

 Rep., Lam., p. 268, pi. 17, figs. 9-9b, 1885), is similar to the variety septentrionalis of A. 

 pcctunculoides and was obtained off Culebra Island, West Indies, in 390 fathoms. 



Cretaceous Species 



Barbatia Catolinensis Conrad, (Kerr's Rep. N. Car., App. A, p. 4, pi. i, fig. 11, 1875; 

 Tryon, Struct, and Syst. Conch., vol. 3, p. 254, pi. 127, fig. 79), is from the Cretaceous 

 of North Carolina. It is not A. carolinensis Wagner, 1847. Barbatia lintea Conrad, (1. c, 

 p. 4, pi. I, fig. 12), is also from the Cretaceous of North Carolina. Dall states that it is 

 not Area lintea Conrad, Dead Sea Expedition, 1852. Barbatia lineata Tryon, (Struct, and 

 Syst. Conch., vol. 3, p. 254, pi. 127, fig. 65), and Barbatia lineata Meek, (U. S. Geol. Surv. 

 Territories, vol. 9, p. 78; 1876), are misyjrints for the former species, not Area lineata 

 Goldfuss. Conrad also described a Cibota lintea from the Cretaceous of Mississippi, 

 (Acad. Nat. Sci. Phila., Journ., 2d. ser., vol. 3, p. 328, pi. 34, fig. 11, 1858.) 



Dall, (Wagner Free Inst. Sci., Trans., vol. 3, p. 615), includes Nemodon Conrad, 

 (Am, Journ. Conch., vol. 5, p. 97, 1869), in the subgenus Barbatia. The following Cre- 

 taceous species have been referred to Nemodoti by Whitfield, (U. S. Geol. Surv., Mono- 

 graphs, vol. 9, pp. 83-86, 1885), Johnson, (Acad. Nat. Sci. Phila., Proc. for 1905, vol. 

 57, p. 9) and Waller, (Geol. Surv. N. Jersey, Cret. Pal., pp. 385-391, 1907): — Area {Mac- 

 rodo7i) Eufalensis Gabb, Acad. Nat. Sci. Phila., Journ., 2d. ser., vol. 4, p. 398, pi. 68, fig. 

 39, i860, from New Jersey, Georgia, Alabama, Mississippi and Arkansas; Trigonarea 

 eufalensis Conrad, Am. Journ. Conch., vol. 3, p. 9, \%b-]^^Nemodon r^«;7J(// Johnson, 1905, 

 from New Jersey; Leda angulata Gabb, Acad. Nat. Sci. Phila., Proc. for i860, p. 95, pi. 

 2, fig. 12— Nemodon angulatum Gabb, Acad. Nat. Sci. Phila., Proc. for 1876, p. 316, 

 from New Jersey; Nemodon brevijrons Conrad, Kerr's Geol. Rep. N. Car., App. A, p. 4, 

 pi. I, fig. IS, 187s, from New Jersey, North Carolina and Mis.sissippi. This last is not 

 Area brevijrons Sowerby, Zool. Soc. London, Proc. for 1833, p. 22, or Area breviftons 



