1422 ANODONTITES 



This differs from limnoicus by its higher beaks, the system 

 of rays broken and entire and by the zigzag, internal markings, 

 which appear to be somewhat Hke those often seen in A. trape- 

 sialis and its allies. 



Anodontitks inc-vrum (Philippi). 



vShell almost evenly long elliptical subinflated, subsolid, 

 somewhat inequilateral ; beaks considerably elevated ; posterior 

 ridge well developed, rounded, with a radial groove above it ; 

 hinge line lightly arched ; anterior end rounded ; base rounded, 

 sometimes a little fuller behind the middle; posterior end ob- 

 liquely subtruncate above, narrowly rounded below ; surface 

 irregularly and regularly striate ; epidermis greenish ; nacre 

 flesh-color or salmon-tinted. 



Length 52, height 31, diam. 19 mm. 



Peru. 

 Anodonta incarum Philippi, Mai. Bl., XVI, 1869, p. 40. — 



PfmFFEK, Nov. Conch., Ill, 1869, P- A^> p'- cv, figs. 9-1 1. 

 Ghiharis incarmn Simpson, Syn., 1900, p. 921. 



The shell is elliptical or very slightly subrhomboid, while 

 that of A. philippianus, to which it is allied, is decidedly rhom- 

 boid or trapezoid. 



Anodontitks holtonis (Lea). 



Shell oblong, somewhat rhomboid, thin, subinflated, inequi- 

 lateral ; beaks full and elevated ; anterior end narrowed, round- 

 ed above, cut away below ; dorsal and base lines nearly straight ; 

 posterior end obliquely truncate above, rounded below ; surface 

 with irregular growth lines; epidermis with widely spaced, 

 radial rows of loop-like wrinkles, dirty greenish, with several 

 broad, feeble, dark rays behind, subshining; nacre blue, slight- 

 ly iridescent behind : muscle scars shallow. 



Length 68, height 34, diam. 23 mm. 



Colombia. 

 Anodonta holtonis Lea, Pr. Ac. N. Sci. Phila., I, 1857, p. 85 ; 



Jl. Ac. N. Sci. Phila., Ill, 1857, p. 316, pi. xxxii, fig. 31 ; 



Obs., VT, 1847, p. 36, pi. xxxii, fig. 31. — Clkssin, Conch. 



Cab. Ano., 1874. p. 149. pi- i-, figs. 5. 6. 



