218 PROCEEDINGS OF THE ACADEMY OF [1895. 



thickened within, columellar margin very slightly reflexed, extremi- 

 ties united by a very thin yellowish callus. Columella reddish 

 yellow, terminating in a strong tortuous fold. 



Length, 15? ; diam., 9J mm. 



Habitat, Palolo to Niu, Island of Oahu. 



It is Bulimella rosea Swains, var. Hartman, Proceedings Acad- 

 emy of Natural Sciences of Philadelphia, Jan. 31, 1888, p. 30. 



In occasional examples the basal portion below the periphery is 

 light brown, and sometimes a bright chestnut spiral band encircles 

 the periphery. 



Dr. Hartman, in his valuable Synonymic Catalogue of Acha- 

 tinella, has noted this species as a small variety of A. rosea Swains. 

 When we sent him the shell we were unacquainted with the animal. 

 This proves very different from that of A. rosea; and further, the 

 habitats of the two species are separated by a forty mile range of 

 wild mountain ridges and valleys which do not contain any species 

 intermediate or connecting the two. 



Achatinella Lyonsiana, n. sp. PI. X, figs. 9, 10, 11. 



Shell sinistral, imperforate, solid, ovate; spire convexly conical, 

 apex obtuse ; surface shining, striated with delicate growth lines ; 

 apical whorls smooth. Color white, with two reddish-brown bands, 

 one encircling the base, the other passing around the periphery and 

 revolving on the spire just above the suture ; the two bands are 

 sometimes confluent, and often the shell is uniform white, without 

 bands. Whorls 6, narrowly margined above, somewhat convex ; 

 suture moderately impressed. Aperture oblique, white within, sinu- 

 ately oval ; peristome white, rather obtuse, thickened within, basal 

 and columellar margins slightly expanded, extremities united by a 

 very thin callus ; columella terminating in a strong, tortuous, white 

 fold. 



Length, 17 ; diam., 11 2 mm. 



Habitat, Konahuanui Mt. , Island of Oahu ; at an altitude of 

 about 3, 000 feet above sea level. 



Animal : Mantle black, sometimes mottled with white, margined 

 with a narrow line of lighter shade. Superior and under portion of 

 foot light brown. Tentacles, tentacular sheath, and front above 

 very dark brown. 



The form of dentition of this and the other arboreal species of 



