PLEUROCERA. 



53 



Diameter, -52 of an inch; length, 1;28 inches. 



Observations.— A. fine, large, symmetrical species, furnished with 

 a row of closely-set tubercles on the middle of the whorl, and 

 several irregular transverse striaj disposed to 

 be tubcrculate. The seven or eight specimens ^'°- ^^^- ^'^- ^'^^'^' 

 before me are very similar, differing but little 

 in form or color. The oldest one is rather 

 browner. It is remarkable for its regular 

 pyramidal form. The aperture is contracted, 

 and rather more than one-third the length of 

 tlie shelL I have great pleasure in dedicating 

 it to Dr. Foreman to whose kindness I owe the 

 specimen in my cabinet. — Lea. 



This species differs from other tubei'calate Pleurocera in th^ 

 oval form of tlie base of the body-whorl and in possessing 

 several instead of one row of tubercles. Figure 103a is from a 

 specimen in my cabinet, from Coosa River, Alabama, authen- 

 ticated by Mr. Lea,. 



I have been much puzzled by the resemblance of this shell to 

 P. prasiiuitum, Conr. and P. Anthony i.. Lea, and it would not 

 surprise me if the three should be found to be but one species, 

 as the forms of the shell and aperture are similar, and speci- 

 mens of Foremanii in Coll. Haldeman are scarcely tubercled, 

 while in one of the Smithsonian types of AntJionyi a disposition 

 to tuberculation is evident. 



2a. P. Lesleyi, Lea. 



Tryprnwsiomn Lesleyi. Le.v, Proc. Acad. Nat. Sci., p. 4, 1864. Jour, Acad. Nat. Sci., 

 vi,l). IIU, t. 23, f. 59, 1867. 



Description. — Shell tuberculate, pyramidal, dark horn-color; spire 

 exscrted ; sutures irregularly impressed ; whorls about eight, some- 

 what impressed; aperture rather small, rhomboidal, white and 

 sometimes banded within; outer lip acute, very sinuous; columella 

 thickened. 



Operculum ovate, dark brown, rather thin, with the polar point near 

 the base. 



jrahitat.— Smith's Shoals, Cumberland River, East Tennessee; 

 Pulaski County, Kentucky. 



Diameter, -80; length, 1-2 inches. 



