OF CONCHOLOGY. 209 



DESCRIPTIONS OF ACHATINELL.2G. 



[From Zoological Proceedings, London ; Annals of Lyceum Nat. Hist. , 

 New York ; Proc. Boston Nat. Hist. Society and Proc. California Acad. 

 Nat. Sciences, with original remarks and figures not before published.] 



BY W. NEWCOMB, M. D. 



In a genus which numbers nearly two hundred species, it 

 becomes a matter of much importance to call in the aid of 

 figures, as well as descriptions for their correct identification. 

 The editor of the American Journal of Conchologj having 

 offered to give illustrations of species described in the several 

 publications named above, I avail myself of the opportunity 

 to aid in the determination of species that previously may 

 have (to some naturalists) been in doubt. 



The published descriptions are repeated, with reference to 

 the plate, and some original remarks are subjoined. 



1. Achatinella Katjaiensis, Newcomb. 



Annals of the Lyceum Nat. Hist., New York, April, 1860. 

 Plate 13, fig. 1. 



Description. — Shell imperforate, dextral, trochiform, solid, 

 strongly striated and decussated, above blackish-brown, the 

 carina and base dirty white colored; suture crenulated; 7 

 whorls, flatly convex, the last with a cord-like keel in the 

 middle ; aperture irregularly quadrate ; columella short, twist- 

 ed, with one fold. 



Long. T 9 , lat. T 8 o inch. Aperturse long. T 4 , lat. f'| inch. 



Habitat. — Kauai, Sandwich Islands. 



Remarks. — This is undoubtedly one of the most singular 

 forms presented in the genus, and of extreme rarity. The 

 specimen selected for the figure varies from the type in being 

 provided upon the back of the last whorl with three instead of 

 but one keel. Kauai is the most eastern of the large islands 

 of the Sandwich Island group, and by geologists is considered 

 as the oldest in the series ; and it is worthy of remark that not 

 a typical arboreal species of this genus has been met with, nor 

 one ornamented with a variety of painted patterns, as upon the 

 islands farther west. 



