8 Neiv Species of Amastra. 



more or less important characters which separate it from A. umbili- 

 cata. Its spire is longer and more conic in outline. Its last whorlis 

 more rotund and shorter with a flatter base. Its perforation is 

 decidedly narrower and is without the distinct ridge around its 

 margin. Its aperture is wider with a more convex peristome and 

 is decidedly less angular at its junction with the columella ; its 

 columellar fold, similar in position, is not as strong, thinner, 

 slightly more oblique and more deeply seated. 



The only other close relative from Oahu is A. sola Pils., to 

 w^hich it is \^xy closely related. It differs by its longer and more 

 conic spire, flatter and less excavated base. The embryonic shells 

 of these two species are entirelj- different. Those oi A. gouveii 

 are longer, more acute, darker colored, much more distinctly stri- 

 ate, and have a proportionally narrower aperture than those of 

 A. sola. 



A. elephantina, n. sp. 



PL B. Fig. 3. 



The shell is openly perforate, globosely conic, rather thin for 

 a shell of its size, in its fossil state white with the entire margin 

 of the aperture pinkish . Embryonic whorls slighth- convex , almost 

 smooth, somewhat darker than the rest of the whorls. Subsequent 

 whorls convex, the penultimate and last are distinctly distantly 

 though somewhat irregularly striate, between the coarser striae 

 are numerous (6-10) fainter striae. The last whorl is very large 

 and tapers towards the base, it is contracted along the margin of 

 the umbilicus forming a blunt rounded keel. The aperture is 

 rather small, slightly contracted, with a thick heavy pinkish callus 

 within its outer lip. Columella very broad, furnished near its 

 base with a low thick slightly oblique fold. The parietal margin 

 is covered with a rather thick pinkish callus. 



Length 24.4, diam. 15.3, apert. 12.2 mm.; byi whorls. 



Oahu: Waimano gulch (Thaanum). 



Holotype No. 40,719, Bishop Museum. Paratypes in Thaanum 

 collection and that of Acad. Nat. Sci. Phil. 



The present species is very closely related to A.antiqua, 

 Baldwin. It differs, however, in size, more globose outlines and 



form of aperture w^hich is not as distinctly angulate at the base as 



[226J 



