36 AMASTRA. 



Perkins, and if so their identity with either the western or 

 the eastern races could be decided. 



The relations of A. mucronata with A. modesta, dimissa 

 nubifcra and subobscura, require further study with more 

 material than we can command. 



A. SYKESI (Vol. XXI, p. 273), of which we have now seen 

 a good many specimens, seems very well distinguished from 

 the preceding by its much more globose shape. The locality 

 is Pali-koi, Halawa. 



A. SUBOBSCURA H. & P. 



Vol. XXI, p. 276. Ualapue. A smaller form which may 

 be called A. s. puella was taken by Mr. Thaanum in Ualapue. 

 Length 9, diam. 5 mm., with 5y 2 whorls. There is a rather 

 acute peripheral carina on the whorls as far as the middle of 

 the penultimate or farther, but no trace of it appears on the 

 last whorl. It is noticeable above the suture in some speci- 

 mens, nearly or quite concealed in others more closely coiled. 

 Interior bluish white, with a slight thickening within the 

 dark-edged lip in fully adult shells. 



A. KAUNAKAKAIENSIS Pilsbry & Cooke, n. sp. PI. 3, figs. 8, 9, 10. 



The shell is narrowly perforate, oblong-conic, very thin. 

 Chestnut brown, nude and glossy in front of the aperture, 

 elsewhere covered with a very thin russet cuticle, which dark- 

 ens to chestnut and often black on the last half whorl, where 

 it becomes somewhat glossy. Embryonic whorls flattened, 

 carinate and costate ; following whorls moderately convex, ir- 

 regularly striate. Young up to middle of the fifth whorl are 

 acutely angular, but the angle is concealed in adults. Aper- 

 ture dark within, having no white lining and no lip-rib. The 

 columellar fold is thin, oblique. Columellar margin reflected, 

 nearly closing the perforation. 



Length 13, diam. 7.1, aperture 6.2 mm. ; 5% whorls. 



Length 14.2, diam. 7.5 mm., 6 whorls (largest). 



Molokai : pipe-line trail in upper Kaunakakai district, above 

 and a short distance below the spring. Pilsbry and Cooke, 

 Jan. 26, 1913. 



