STREPHOBASIS. 47 



bauds ; Lyonii is usually without bands. Among the specimens before 

 me two have a single band, one ha-i two bands, one has four bands, 

 and another has Ave bands. Four have a dark purple mark round the 

 base of the columella. In those before me the color of the epidermis 

 is very variable ; several are light horn-color, one young one is almost 

 a cinnamon-brown, and three are olivaceous. The old specimens are 

 much eroded at the apex, and this causes a more cylindrical outline. 

 The aperture is about four-tenths of the length of the shell. — Lea. 



8. S. corpulenta, Anthony. 



Melanin corpulenta, Anthony, Ann. Lye, N. H., vi, p. 127, t. 3, f. 28, March, 1854. 

 BisxEV, Check List, No. 70. Brot, List, p. 32. 



Description. — Shell ovate, smooth, yellowish, banded ; whorls 6-7, 

 convex; body- whorl very full, with two distant dark brown bands 

 quite broad, which are nearly concealed on the upper ^j^ g, 

 whorls by the revolutions of the spire; sutures impressed; 

 aperture narrow ovate, broadest at base, banded within; 

 columella much curved below the middle, white, and 

 thickened at base, with a broad and distant sinus in that 

 region. 



Habitat. — Alabama. 



Diameter, -42 inch (10 millim.); length, -80 inch (20 millim.). 



Length of aperture, -40 inch (10 millim.); breadth of aperture, 

 •17 inch (4 millim.). 



Observations. — Its most prominent character is the corpulence of 

 the body-whorl, and its regular oval form. May be compared with 

 M. hitxniata, Cour., but its body-whorl is much more rounded or oval, 

 litis less banded, and the bands are more distinct; the spire is more 

 elevated and less abrupt. — Anthony. 



In the shape of the aperture this resembles S. cornea., Lea, 

 but it appears to differ iii the superior portion of the bod}-- 

 ■whorl beinof swelled out. 



9. S. biteeniata, Conrad. 



Melanin biteeniata. Conrad, Xew Fresh Water Shells, p. 52, t. 8. f. (>. 18:!t. DkKav, 

 Moll. N. Y., p. 94. WiiEATLEY, Cat. Shells U. S., p. 24. Binnev, Check 

 List, No. 34. Brot, List, p. 32, Ham-EV, Conch. Misc., t. 8, f. 73. 



Ancnlotiis litfnniatus, Conrail, Rekve, Monog. Ancnlotus, t. 3, f. 25. 



Str(phobasis Clurkii. Lea. Proc. Acad, Nat. Sci., p. CU, ISGl. Jour. Acad. Nat. Sci., 

 V, pt. 3, p. 2C2, t. 35, f. 7G. Obs., ix, p. 87. 



