Original Descriptions of Achatinella. 125 



slightly convergent and united by a thin callus; columella light 

 brown, very slightly developed, plain and smooth. Length 24, 

 diam. iS mm. 



Animal in motion longer than the shell. Mantle black, mar- 

 gined with gray. Foot above and below gray, the superior por- 

 tions lightly granulated. Tentacles light gray. 



There occurs also a pure white form of the shell without the 

 peripheral band, and a form white with a light chestnut band on the 

 apical whorls. The animals of these varieties vary only a trifle 

 from that of the typical form. 



This species belongs to the group of A. physa Xewc, but is 

 easily distinguished by its much more inflated body whorl, and 

 smaller spire, its smoother and polished surface. The habitats of 

 the two species are widely separated and the animals are entirely 

 different. The animal of A. physa mantle and foot, is a dingy 

 white with a greenish 3'ellow tinge. 



We dedicate the species to Mr. J. Lewis Horner, the young 

 naturalist to whom science is indebted for the discovery of this 



species. They are valuable additions to 



the shells of the Island of Hawaii, which has heretofore furnished 

 only one described arboreal species of Achatinella. — Bald. 



Hab. Hamakua. — Bald. 



