Ori%i7ial Descriptions of Achatinella. 55 



dentately plicate ; burnt yellow, lower half of the last whorl bright 

 chestnut, sometimes chestnut throughout, columella and interior 

 of the aperture white. 



Hab. Makiki to Nuuanu. 



A great many color varieties are found, from almost jet-black to 

 rich bright chestnut, with and without bands. The author's collec- 

 tion contains a very extensive series of these beautifully colored 

 shells. 



69. Achatinella adusta Reeve. 



A. adusta Rve. Conch. Icon. Achat., London, 1850, sp. 30. 



Shell acuminately oblong, somewhat turreted, sinistral, whorls 

 rounded, columella short, callous, toothed ; dark chestnut, darker 

 toward the base, with a spiral black band beneath the sutures, 

 columella pinkish. 



Hab. Makiki to Nuuanu. 



This is only a variety of A. casta?iea Rve. It is distinguished 

 by a black sutural band. 



70. Achatinella ernestina Baldwin. 



A. ernestina Bald. P. Acad. Phil., 1S95, p. 217, pi. x, figs. 5, 6. 



Shell sinistral, subperforate, moderately solid, ovately conical; 

 apex subacute ; surface shining, obliquely striated with delicate 

 growth lines, under a strong lens exhibiting numerous, very close, 

 and minute decussating striae ; apical whorls smooth, scarcely 

 decussated. Color yellow, lighter above; variously striped with 

 transverse, dark chestnut bands, the more constant being one bor- 

 dering the suture, one at the periphery, spiral above, and one 

 encircling the base. Whorls 6, narrowly margined above, some- 

 what convex ; suture moderately impressed. Aperture oblique, 

 oval, faintly exhibiting the dark bands of the exterior ; peristome 

 acute, somewhat thickened within, slightly expanded, white, the 

 coloring of the exterior bands appearing on the inner edge ; col- 

 umella white, terminating in a prominent, oblique, tortuous fold. 



Length 21, diam. 12 mm. 



The animal, when extended in motion, as long as the shell. 

 Mantle light brown, sprinkled with black and margined on the 

 outer edge with an interrupted reddish-yellow line. Superior por- 

 tion of foot light brown, thickly studded with small slate spots ; 

 under portion of foot light brown with a slate tinge. Tentacles 

 dark slate. 



This species is found near the mountain ridge separating the 

 habitats of A. castanea Rve. and A. fvscolineata Sm.; and in gen- 

 eral appearance and characters it is intermediate between these 



