﻿ANODONTOIDES 4^7 



Aiiimal with marsupium occupying the outer and sometimes 

 the four leaves of the branchiae ; ovules more numerous in the 

 outer, the whole pad-like ; gills large, inner semicircular, free 

 from the alxlominal sac, or united to it; branchial opening 

 large, with many small papilla ; anal opening with well-devel- 

 oped papill;^. 



Type, Anodonta fentssaciana Lea. 



Anodontoides ferussacianus (Lea). 



Shell long elliptical, scarcely subsolid, inequilateral, subin- 

 flated; beaks full and high, sculptured with a few concentric 

 ridges, which curve upward behind and are suddenly and an- 

 gularly turned upward and forward, returning as fine raised 

 threads to the nucleus and behind the other sculpture there are 

 several radiating, raised lira?. Posterior ridge rounded or some- 

 times faintly biangulate, ending .behind about on the median 

 line ; anterior end rounded ; posterior end rounded, feebly 

 pointed or biangulate; dorsal line slightly incurved in front of 

 the beaks; basal line nearly straight, often faintly incurved in 

 the middle ; epidermis greenish, often faintly rayed ; hinge line 

 often a little swollen in front of the beaks where it is incurved, 

 otherwise usually edentulous; nacre bluish-white or bluish, 

 generally bright and iridescent, behind. 



Length 86, height 45, diam. 34 mm. 



Length 92, height 53, diam. 40 mm. 



Mississippi drainage area generally; St. Lawrence River 

 system ; Red River of the North ; Saskatchewan River ; Connec- 

 ticut ? 



Type locality, Ohio River. Cincinnati, O. 

 Anodonta fcnissaciana Lea, Tr. Am. Phil. Soc, Y, 1834, p. 



4.S, pi. vr. fig. 15; Obs., I, 1834, p. i57< pl- vi. p. 15-— Mus- 



GROVE, Phot. Conch., 1863, pi. i, fig. 15.— Clessin, Conch. 



Cab. Ano., 1873, p. 75, pi. xxiii, fig. 4- 

 Anodon fcnissaciana De Kay, Zool. of N. Y., Pt. 5, 1843. p.. 



200, pi. xvT, fig. 230. — SowERBY, Couch. Tcon., XYH, 1867., 



pi. XIV, fig. 51. 



