1 8 Tlircc New Species of Amastra from Oahu. 



thin and slightly oblique. Outer margin of lip thin, slightly 

 thickened within, erect, regularly curved, forming an angle with 

 the base of the columella ; columellar margin thin, reflexed above 

 the umbilicus. Umbilicus minute, semicircular. Length 11.2, 

 diam. 7.2, length of ap. (diagonal) 5.9 mm. 



Oahu : Summit of Lanihuli, at 2700 ft. (Spalding). 



Type No. 16,633, Bishop Museum Coll. 



This species is undoubtedly related to A. breviata Baldwin. 

 It is, however, smaller, with a more acute and slightly concave 

 spire, and the arrangement of its color is different. 



A second specimen has the following measurements : length 

 10.8, diam. 6.9 mm. 



Amastra spaldingi, n. sp. 



Fig. 2. 



The shell is imperforate, dextral, cylindrically ovate, some- 

 what thin, irregularly and faintly striate with lines of growth, the 

 third whorl distinctly and diagonally striate, the third and fourth 

 whorls having a distinct spiral thread just above the sutures, the 

 first three whorls light brown with a yellowish tinge, the lower 

 three of a uniform dark resinous chestnut. Spire subcylindrical, 

 with slightly convex outlines, apex somewhat obtuse. Suture 

 simple, hardly impressed. Whorls 6^ , increasing somewhat regu- 

 larly, the embryonic somewhat convex, the rest flatly convex, the 

 last cylindrical, tapering gradually towards the base. Aperture 

 subpyriform, bluish within, scarcely oblique. Columella nearly 

 straight, hardly twisted ; columellar fold basal, rather small, thin, 

 oblique, flexuous. Outer margin of lip regularly curved, erect, 

 thin, forming a slight angle with the base of the columella ; colu- 

 mellar margin thin, appressed, adnate. Length 18.9, diam. 9.6, 

 length of ap. (diagonal) 8.1 mm. 



Oahu : Summit of Konahuanui, at 3300 ft. (Spalding). 



Type No. 16,451, Bishop Museum Coll. 



A. spaldingi is not closely related to any of the alread)' de- 

 scribed species. Its nearest congener is, probably, the species 

 wrongly described and figured by Reeve as A. ve?itulus Fer. 



[214] 



