28 New Species of Amastra. 



state the last two whorls are white, becoming darker above, the 

 apical whorls being of a dark reddish-brown. In two specimens 

 there are traces of a thin dark greenish-brown epidermis. Embry- 

 onic whorls flattened, the first nearly smooth, the next distinctly 

 costate, the costse ending in a carina which is situated well above 

 the deep suture. The rest of the whorls are quite regularly 

 sculptured with fine growth-striae The last whorl large, rounded. 

 Aperture very oblique, large, nearly one-half the length of the 

 shell, its outer margin quite convex and furnished with a distinct 

 lip-rib. Columella short and broad, with its outer margin closely 

 appressed to the shell. Columellar fold strong, nearly median in 

 position, subtransverse and terminating abruptly close to the 

 margin of the columella. 



Length 14.5, diam. 8.7, apert. 7.1 mm., 6 whls. (Holotype) 

 " 15-8, " 9.0, " 7-3 " 6^ " 



•' 15-7, " 9.2, " 7.2 " ey 4 " 



East Maui: Just below Kaupo gap along the trail, about 

 5,000 feet elevation (Meinecke) (communicated by D. Thaanum), 

 (Cooke). 



Holotype No. 41,990, cotypesNo. 41,991, paratypes No. 38,533, 

 Bishop Museum, also in Mr. Thaanum's collection. 



This species is undoubtedly a reversed form somewhat dis- 

 tantly related to species of the series of A . assimilis. It agrees 

 closely to the species of this series in the form and surface sculp- 

 ture of the embryonic whorls. It probably has no close relation- 

 ship with the numerous Mauian species belonging to the section 

 Heteramastra . In immature specimens there is a distinct oblique 

 angle at the periphery. In a single specimen there are indistinct 

 spirally descending facets on the last whorl. A. mirabilis is 

 undoubtedly related to A. farcimen. It differs considerably in 

 size, compactness and greater proportional diameter. The spire 

 of A. mirabilis is contracted and in outline shows a much more 

 acute angle than that of A. farcimen. Unfortunately the latter 

 species is entirely unknown to modern collectors. The finding of 

 A. mirabilis indicates that Dr. Pilsbry was right in placing A. 



farcimen in the Mauian fauna. 



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