^o Calvix Goodrich 



This is a small local race, superlicially resembling A. plicata Conrad, but 

 more closely related to A. aiiipla. In the type lot. 21 of the shells have 

 the folds as in the type, 10 have strong, oblique plicae crossing three to 

 five folds and ending just below the shoulder, 3 are without folds or plicae. 

 Two or three specimens have small folds continuing from suture to base. 

 There is very slight difference in the form of the shells, virtually all having 

 a flattened apex very little eroded, the flaring peristome and the flat 

 columella. 



]\Iore shells than any others had the arrangement of six bands of the 

 type. Several modifications, however, were noted; eight specimens of the 

 type lot, for example, having the formula of four bands which prevails in 

 ampla. One shell in four of the type lot was melanic. 



Little variation occurs in the columella. The color is usually purple. The 

 peristome is straight, a little sulcate in young specimens where the folds 

 reach the outer lip. Xo shell with perfect apex appears in this collection, 

 but from specimens only slightly eroded the embryo seems to have been 

 about one and one-half whorls in size, smooth and in nearly the same plane. 

 The characteristic sculpture apparently develops immediately with the first 

 growth after the nuclear whorls. 



Little Cahaba Creek 



Ancnlosa plicata (Conrad) 

 Fig- 25 



Anculotus plicatus Conrad, New Fresh Water Shells of U. S., p. 61, 1834. 



Anculosa bella Lea, Proc. Amer. Phil. Soc, II, p. 83, July, 1841. 



Anculosa tujberculata Lea, Proc. Amer. Phil. Soc, p. 83, July, 1841. 



Anculosa rubiginosa Lea (?), Proc. Amer. Phil. Soc, p. 83, July, 1841. 



Anculosa tintimiabulum Lea (in part), Proc. Amer. Phil. Soc, IV, p. 167, 1845. 



Anculotus smaragdinus Reeve, Monog. Anculotus, t. 3, f. 23, April, i860. 



Conrad described his species as inhabiting "tributaries of the Tennessee 

 River in Alabama." The description of plicatus fits the characteristic 

 Anculosa of the Black Warrior River and not at all any mollusk of the 

 Tennessee drainage. That Conrad collected in the Black Warrior is eviden- 

 ced by his frequent references to the river in his "New Fresh Water Shells,'' 

 and indeed several of his types came from that stream. If his mistake was 

 not that of confusing notes or labels, he might very well have been under 

 the impression at the time of collecting plicatus that his stream belonged 

 to the Tennessee system, for tributaries of the Tennessee and the Black 

 Warrior very nearly interlock. 



The question of Lea's rubiginosa is discussed elsewhere in this paper. 

 The recognized tintinnabiiluiH Lea occurs in East Tennessee, the author 



