﻿470 AXODONTOIDlvS 



Anodonioidcs stihcyliiuiraccus liAKKR, ^[oll. Chicago, Pt. i, 



1898, p. 74, pi. IV, fig. 4; VI, fig. I. 

 Anodontoidcs fcrussacianus var. sithcyliiidnicciis Simpson, 



Syn., T900, p. 660. 



T am doubtful whether the type of . hiodonta biichancnsis is 

 in Lea's collection. There is a shell placed with a number of 

 others (Museum number 86719) labeled ".hiodonta biichan- 

 cnsis, r>uck Creek. M. G. W.," which in size and general form 

 is mucii like his figure of liiat species, Init the outlines do not 

 closely agree. The shells placed under this number varj' be- 

 tween this and ty]>ical fcnissacianiis. It probably ccjuals Lea's 

 J. siihcyliiidracca. the type of which T have not seen. 



Anow)NToides modkstus (Lea). 



Shell small, long obovate or subrhomboid, being a little wider 

 behind than in front, thin or almost subsolid, inequilateral, 

 subinriated ; beaks moderately full and elevated, rather sharp, 

 sculptured with a numl)er of parallel, somewhat doubly-looped 

 ridges, which turn up behind and return to the nucleus in the 

 form of delicate raised threads ; behind these there are a num- 

 ber of radial threads: posterior ridge subbiangular, almost 

 double, ending behind below the median line in a feeble bian- 

 ulation ; base full just behind the middle, in front of it straight 

 or a very little emarginate ; surface with uneven growth lines ; 

 epidermis ashy-green with darker bands with two or three 

 dark rays on the posterior slope ; hinge line a very little in- 

 curved in front of the beaks where it is scarcely thickened ; 

 nacre bluish, subshining, iridescent behind. 



I^ength 47, height 24, diam. 17 mm. 



Type locality, Pond near Kalamazoo. Michigan. 

 Anodonta modesta Lea, Pr. Ac. Nat. Sci. Phila., 1857. p. 84; 



11. Ac. Nat. Sci. Phila., I\', i860, p. 364, pi. lxih. fig. 189; 



Obs., VIIT, i860, p. 46, pi. i.xiii, fig. 189. — Cuvssix. Conch. 



Cab. Ano.. 1874, ]). 153. pi. xi.ix, figs. 7. 8. 

 }fari^a)'ou (.Inodonta I modesta Li:a, Syn.. 1870. p. 79. 

 Anodon niodcstns Sowi;ri!V, Conch. Icon.. .WIT, 18^)7. pi. x, 



fi<r. 26. 



