36 LAND AND FRESH-WATER SHELLS OF N. A. [PART IV. 



C. Shell obliquely flattened. 

 10. L. compacta, Anthony. 



Melanin compacta, Anthont, Ann. N. Y. Lye, vi, p. 122, t. 3, f. 22, March, 1854. 



BixNEV, Check List, No. 62. Bkot, List, p. 32. Reeve, Monog., sp. 343. , 

 Lithasia nucka, Lea, Proc. Acad. Nat. Sci., p. 1S8, 18G0. Jour. Acad. Nat. Sci., v, 



pt. 3, p. 2G3, t. 35, f. 73. 01)s., ix, p. 8.5. BiNNEY, Clieck List, No. 301. 

 Melania nuclea, Lea, Reeve, Monog., sp. 423. Bkot, List, p. 33. 



Description. — Shell ovate-conic, smooth, thick yellowish-green ; spire 



obtusely elevated ; whorls al30ut five, nearly flat ; body-whorl large, 



subangulatcd near the base, with three very dark bauds, 

 Fig. 80. ° 



two of which are below the angle ; the penultimate whorl 



has two bands only, and the lowest of these is nearly 

 or quite concealed by the suture, and on the upper whorl 

 the same band is Indicated only by a dark hair-like line ; 

 sutures well impressed; aperture rather large, ovate, 

 within whitish and banded; columella strongly indented, base reg- 

 ularly rounded, without any sinus. 

 ^a5ito«.— Alabama. 



Diameter, -38 inch (10 millim.) ; length, -GO inch (15 millim.). 

 Length of aperture, -SO inch (7i millim.); breadth of aperture, -18 

 inch (ih millim.). 



Observations. — A short, thick, compact species, with seldom more 

 than three perfect whorls remaining, other two whorls being indi- 

 cated on the abruptly decollate spire ; the whorls are slightly shoul- 

 dered, and the lines of growth are curved and prominent; compared 

 with M. fusi/ormis, Lea, it is less fusiform, more ponderous, has the 

 spire less acute, and an aperture entirely different ; from M. protetts, 

 Con., it differs in its totally different spire and aperture, and its want 

 of the tuberculous shoulder of that species ; the bands in the interior 

 are very dark and well defined. — Anthony. 



The following appears to be a synonyme, judging from the 

 comparison of type specimens of each. 



Lithasia miclea. — Shell smooth, elliptical, yellowish-olive, 

 thick, solid, three-banded; spire obtuse-conical; sutures im- 

 pressed; whorls five, the last large and slightly inflated; 

 aperture rather small, ovately rounded, white and three- 

 banded within, recurved at the base; columella thickened above and 

 below, incurved ; outer lip sharp. 



