EURYC^LON. 341 



Genus EURYC^LON, Lea. 



Eurycoelon, Lea, Proc. Acad. Nat. Sci., p. 3, Jan., 1864. 



Description. — See Preliminary Observations, p. xxx. 



Geographical Distribution. — The species of Eurycadon are 

 not numerous, and appear to be confined to the waters of 

 East Tennessee and North Alabama.* 



1. E. Midas, Lea. 



Melanin Midas, Lea, Proc. Acad. Xat. Sci., p. 119, 1861. 



Goniobasis Midas, Lea, Jour. Acad. Nat. Sci., v, pt. 3, p. 233, t. 34, f. 28, March, 

 1863. Obs., ix, p.55. 



Description. — Shell smooth, cylindraceo-elliptical, somewhat thick, 

 greenish, obscurely banded; spire very obtuse; sutures irregularly 

 impressed; whorls somewhat compressed, the last very large, ob- 

 scurely striate below; aperture large, ear-shaped, bluish-white with- 

 in ; outer lip acute ; columella bluish-white, thickened and inflected, 

 obtusely angular at the base. 



Operculum subelliptical, spiral, dark brown, with polar point near 

 the inner edge and one-fifth from the base. 



Habitat. — Coosa and Alabama Rivers, near Wetumpka; Dr. E. R. 

 Showalter. 



Diameter, -48; length, -98 of an inch. 



Observations. — This is a well marked species. There are several 



specimens before me, differing but little. Two of them have a brown 



band in the interior of the upper part of the aperture, 



^^ ^ ' ' Fig. 650. 



another has none, but exhibits an obscure row of spots 

 on the upper whorls, which others have also. Two of 

 the specimens have irregular, tuberculous swellings on the 

 upper part of the whorls, which obscure the bands, and 

 thus cause them to take on a maculate character. The in- 

 crement of growth usually commences below the previous 

 termination, leaving angles on the sutures. In this character one 

 is reminded of Melania (Goniobasis) oppugnata (nobis). In these 



• I am now Inclined to consider tlicse slicHs to l^e distorted Goniobases and Anrnlnme, 

 and in none of lliciii c;mi I find generic cliaracters. They might wltli advantage to science 

 be relegated to lliose genera. April, 1873. 



