THE NAUTILUS. 127 



OXYCHONA BIFASCIATA (Burrow, 1815). PI. IV, figs. 4, 8. 



This is described by Burrow as "white with two purplish 

 brown transverse bands and a dark brown apex. Inhabits Per- 

 nambuco." The figure, shows the outer lip to be expanded 

 and thickened within ; it measures, length 18, diam. 18 mm. 



Specimens in collection of the Academy are variously banded 

 (pi. IV, figs. 4, 8), and have two very small dark spots behind 

 the upper lip in two specimens, none in two others. The upper 

 lip is well expanded, calloused within, the callous thicker near the 

 periphery, giving the inner edge a sinuous contour. The basal 

 lip is wider than in blanchetiana, and the last whorl is barely 

 concave above the keel, not pinched out as in blanchetiana. The 

 outlines of the spire are almost straight. In one of the four ex- 

 amples the tip of the apex is dark. In one of the specimens 

 the lip has the faintest roseate tint, which becomes distinct at 

 the columellar insertion. The others have a white lip ; and this 

 was no doubt the typical color, as a colored lip would have 

 been mentioned by Burrow. 



Length 15, diam. 16.4 mm.; 6^ whorls. 



Length 15.4, diam. 17 mm.; 6^ whorls. 



OXYCHONA BOSCIANA (Ferussac). 



Ferussac's figured type shows dark bands a short distance 

 below and above the periphery, another below the suture ; the 

 upper two bands spreading ?nto blotches behind the lip ; spire 

 slightly concave, and the latter part of the last whorl strongly so 

 near the periphery, causing the aperture to be conspicuously 

 produced, spout-like. The upper lip is sinuous, and not at all 

 expanded. Length about 16|-, diam. about 21 mm. Lip white. 



Helix bosciana was mentioned in the Prodrome, but first defined 

 by three figures in the Histoire naturelle, pi. 64, fig, 1. This is 

 one of the old plates, drawn by Bessa and engraved by Coutant. 

 I do not know the date of issue, but it was probably not long 

 after 1820. 



OXYCHONA BOSCIANA BLANCHETIANA (Moricand, 1833). PI. IV, 

 figs. 2, 3. 



Mem. Soc. de Phys. et d' Hist. Nat. de Geneve, vi, p. 539, 

 pi. 1, f. 3. 



