164 ACTION. 



The aperture is lunate, about three-fifths the length of the shell. 

 The columella, about one-third the length of the aperture, is flat, 

 and divided by a single groove. (Gld.~). 

 Alt. 6-25 diara. 4'16 mill. 



Of Patagonia (U. S. Ex. Exped.). 



Tornatella bullata GLD., Proc. Bost. Soc. N. H. ii, p. 251 (Dec., 

 1847) ; U. S. Expl. Exped., Moll., p. 218, f. 263a-6. 



The following species is very closely allied to this. 



A. VAGABUNDA Mabille & Kochebrune. PI. 18, figs. 95, 96. 



Shell ovate-conic, rather thin, solid, shining, dull reddish, spirally 

 sulcate; sulci on first whorls slightly elevated, about 5; on last 

 whorl 20 or 22, flattened, regularly spaced. Spire elevated, conic- 

 subpyramidal, the apex large, white, lirate, mammillate. Whorls 

 5, convex separated by an impressed suture, especially the earlier 

 ones. Last whorl large, two-thirds the entire length, slightly swollen, 

 narrowed toward the base, and descending slowly to its termination. 

 Aperture nearly vertical, semi-ovate ; peristome nearly straight, 

 slightly thickened, the terminations joined by a very thin white 

 callus, outer margin well curved, simple ; basal margin slightly 

 thickened and effuse, columellar margin appressed. Columella 

 white, thickened, twisted, divided by a superficial groove, prolonged 

 to the base of the aperture. Alt. 9, diam. 5 mill. (M. & ^.). 



South of Cape Horn. 



Tornatella vagabunda MAB. & ROCH., Bull. Soc. Mai. Fr. ii, 

 p. 208, 1885. Miss. Sci. Cap Horn, Moll., p. 12, pi. 6, fig. 2. 



Separated from Tornatella bullata Old. by the more elongated 

 form, last whorl less swollen, greater number of whorls, same num- 

 ber of spirals on the earlier, but greater number on the last whorl ; 

 narrower aperture, with less arcuate and narrower outer lip, and 

 stronger columella. 



A. VENUSTUS d'Orbigny. PI. 18, figs. 100, 101. 



Shell elongated-cylindrical, thin, roseate, transversely striated ; 

 spire elongated, the apex obtuse ; whorls 5, the last large. Aperture 

 narrow and long; columella with one projecting fold. Length 10, 

 diam. 3 mill. (Orb.'). 



Payta, Peru. (Fontaine). 



Tornatella venusta ORB., Voy. dans 1'Amer. Me>. p. 399, pi. 56, f. 

 4-6. Actceon venusta ORB., t. c., p. 700. 



