THE NAUTILUS. 



VOL. XIX. JANUARY, 1906. No. 9. 



NEW AND LITTLE KNOWN SPECIES OF AMNICOLIDAE. 



BT BRYANT AVALKER. 



Most of the following species were found by Mr. A. A. Hinkley 

 of Du Bois, Illinois, while on a collecting trip through Tennessee, 

 Mississippi and Alabama, in the fall of 1904. A few others re- 

 ceived from different sources have also been included. 



SOMATOGYRUS SUBSTRIATUS, 11. Sp. PL 0, fig. 1. 



Shell subglobose, imperforate, shining, light greenish-yellow, lightly 

 but distinctly striate, spire somewhat elevated, apex obtuse. Whorls 

 4-4^, those of the spire prominent and roundly shouldered ; body- 

 whorl large and well rounded ; suture deeply impressed. Aperture 

 large, quite oblique, suborbicular, slightly emarginate at the base 

 and somewhat roundly projecting at the juncture of the lip with the 

 base of the columella ; lip thin, projecting above and drawn back 

 below. Slightly thickened within. Columella rather narrow, with 

 a heavy rounded callous, which is thinner on the body-whorl and 

 separated below by a narrow axial groove. 



Alt. (apex eroded) 6, diam. 4 mm. 



Types (No. 22370 Coll. Walker) from the Tennessee River at 

 Florence, Ala. Also Tombigbee River at Columbus, Miss. Cotypes 

 in the collections of the Academy of Natural Sciences and A. A. 

 Hinkley. 



This is one of the largest species of the genus, being exceeded in 

 size only by S. subglobosus. It is a well marked form, very much 

 like a small Fluminicola nuttattiana Lea, in appearance, and is easily 



