AMASTRA, MOLOKAI. 261 



Some smaller shells, 21x11 and 19.5x11.8 mm., have a de- 

 cidedly pink ground-color. They may not be fully adult. 

 Some of the shells figured as nubilosa by Borcherding seem 

 to belong to this variety. Two of his figures are copied, fig. 

 11 from Makolelau, and fig. 12 from Kaohu. This form is 

 somewhat intermediate between nubilosa and violacea. 



Series of A. pullata. 



Embryonic shell costate, carinated above the suture (the 

 carina rarely concealed), last whorl -covered with a dense 

 dark cuticle; penult, whorl usually streaked, angularly 

 marked or mottled. Bather large species, confined to Molo- 

 kai, separated from the assimilis series by the general appear- 

 ance, size, and dense, dark cuticle covering the last whorl, 

 rather than by any characters of taxonomic value. It is ap- 

 parently related to the nigra series of Maui, but has no repre- 

 sentatives in Lanai. 



A single Oahuan shell, A. tristis, has much the appearance 

 of the pullata group, being similar in shape, covered with a 

 conspicuous blackish cuticle, and having an indistinctly cos- 

 tate, conic embryonic shell; yet other characters cause us to 

 consider it convergent, rather than directly related to pullata. 



71. A. PULLATA Baldwin. PI. 27, figs. 14-16. 



The shell is obese, oblong with conic spire, thin but strong, 

 of a very pale ochre tint under the cuticle, which is more or 

 less worn from the spire and denuded in a rather large patch 

 in front of the aperture. On the last whorl the cuticle is 

 rather glossy, chocolate-blackish and very dense. On the 

 spire it is copiously streaked with buff, the dark streaks be- 

 ginning on the fourth whorl. The embryonic shell is flesh- 

 colored, with sculpture of coarse curved ribs (resembling 

 aurostoma, pi. 26, fig. 11, except that the peripheral carina is 

 less prominent, from being more covered by the following 

 whorl). Subsequent whorls are convex, with moderate 

 growth-wrinkles. The aperture is pure white within. Outer 

 lip thin-edged, sometimes strengthened by a narrow and low 

 internal rib. Columellar lamella thin, steeply descending, 

 abruptly truncate at the end. 



