354 HELICINAD^;. 



must be an immature, brown specimen, like that which 

 has been called H. rubella. H. minuta, Sowb. (Thes. 

 Conch, f. 40, 41,) seems also to be the same. If. am- 

 beliana., De Roissy, agrees well with the large banded spe- 

 cimens from Texas. Dr. Pfeiffer regards it as the same 

 as a shell from Texas Avhich he has under the name of 

 H. tropica, Jan. When young, the shell is girdled with 

 lines of loosened epidermis, producing a coarse, velvety 

 surface. These are soon worn off, and the surface be- 

 comes smooth ; the lip becomes greatly thickened, and 

 its inner face shoots out, so as to form a double lip. The 

 true habitat seems to be Texas, where the shell is very 

 abundant, and acquires a great size and thickness. The 

 general globular form, smooth surface, and the lip with 

 its peculiar basal angle, are its permanent charac- 

 ters. [G.] 



2. HELICINA CIIRYSOCHEILA, BlNNEY. 

 PLATE LXXIV. FIGURE 4. 



H. testa ovato-conica, tenui, nitida, lutea, striis tenuissimis 

 decussantibus insculpta ; anfractibus quinque, convexiusculis, 

 ultimo magno, ad peripheriam angulato ; basi complanato ; 

 apertura perobliqua, semi-elliptica ; labro tenui, reflexo, 

 fiavo, callo labiali aurantiaco. 



DESCRIPTION. 



SHELL broad conic, or pyramidal, thin, shining, pale 

 yellow, with the surface finely shagreenecl with micro- 



