ANODO'NTITES 



1417 



Anodonta napoensis Lea, Pr. Ac. N. Sci. Phila., XII, 1868, p. 



162; Jl. Ac. N. Sci. Phila., VI, 1868, p. 324, pi. uii, fig. 137; 



Obs., XII, 1869, P- 84, pi. Lin, fig. 137.— Clkssin, Conch. 



Cab. Alio., 1873, P- 116, pi. XXXIV, figs. 3. 4. 

 Margaron (Anodonta) napocnsis Lea, Syn., 1870, p. 80. 

 Glabaris napoensis Simpson, Syn., 1900, p. 920. 



The figured type of this species is a single right valve in the 

 collection of the National Museum and is a singular shell. It 

 is very solid, very dark, and most peculiarly and delicately 

 sculptured. The dorsal outline is much more strongly curved 

 than is that of the base. The hinge has been ground away but 

 it is apparently edentulous. Lea has other shells, which he 

 refers to this species, which I think are something else. 



Anodontites TORTiLis (Lea). 



Shell subrhomboid, convex, scarcely subsolid, inequilateral ; 

 beaks only moderately full and elevated; anterior end some- 

 what narrowed, rounded ; dorsal outline arched ; dorsal slope 

 obliquely truncated ; base curved, often quite full behind the 

 middle ; surface with irregular growth lines ; epidermis much 

 wrinkled and looped, the loopings often disposed in a radial 

 manner ; that of the posterior end usually concentrically 1am- 

 ellose ; greenish-yellow or yellowish-green, often dull and dirty 

 colored ; nacre bluish, sometimes a little lurid ; muscle scars 

 shallow. 



Length 70, height 47, diam. 25 mm. 



Cartagena, Colombia : British Guiana ; Isthmus of Darien ; 

 Nicaragua ; Costa Rica. 

 Anodonta tortilis Lea, Tr. Am. Phil. Soc, X, 1852, p. 291, pi. 



xxviii, fig. 54 ; Obs., Y, 1852, p. 47, pi. XXVIII, fig. 54.— 



Clessin, Conch. Cab. Ano., 1875, p. 166, pi. lv, figs. 7, 8. 

 Margaron (Anodonta) tortilis Lea, Syn., 1852, p. 47; 1870, p. 



75- 

 Anodon tortilis Sowerhy, Conch. Icon., XVII, 1870, pi. xxxvii, 



%• 154- 

 Glabaris tortilis Simpson, Syn., 1900, p. 920. 



