26 Original Descriptions of Achatinella. 



necklaces, bracelets, and other ornaments : one of these necklaces 

 afforded a singular species of the Helix genus of Linnaeus, which 

 I am informed is a fresh water shell. It is outwardly smooth, has 

 seven spires, and is of a black-brown colour, except the tip. which 

 is pale yellow : the inside is smooth and white, and the mouth is 

 marginated within. It is remarkable for a knob or tooth on the 

 columella, but which does not wind round it, consequently ex- 

 cludes it from the Voluta genus of Linnaeus, to which at first sight 

 it appears to be related. As I presume it to be a species hitherto 

 undescribed, I have taken the liberty to give it the trivial name of 

 Apex Fulva, or the Yellow Tip. A figure of it, in two views, is 

 given in one of the following plates." 



Hab. H. I. — Dixon. Kawailoa. — Bald. Waialua. 



This shell, the first of the Achatinellidse ever described, is 

 very rare now, if not extinct. Some dark forms of A. swiftii Newc. 

 approach near to it, but yet seem to be distinct. The shells 

 grouped with this are also sometimes classed as the sxcijtii group, 

 but the older name is better. 



27. Achatinella pica Swainson, 



A. pica Swain. Zool. 111., iii. p. 99, fig. i. 1S32. 



A. testa trochiformi, nigra; apice columellceque basi albis. 



Shell trochiform, black ; apex and base of the pillar white. 

 Shell 7-10 of an inch long, body whorl convex, spire conic ; the three 

 upper whorls white or fulvous, without any convexity, and form- 

 ing a conic point. Suture thickened, and margined by a sulcated 

 groove. Interior of the aperture and base of the pillar white : the 

 latter tinged with rose color ; margin of the outer lip within, bor 

 dered with black. 



Mr. Swainson, in the Quart. Journ. of Sci., Lit. and Art, vol. 

 XXV, Jan. to June, 1828, gave the following interesting notes on 

 the shells : "The shells forming the present group are all of a 

 small .size ; the largest not equalling an inch in length. In gen- 

 eral they resemble Bulimi, both as regards form, and the propor- 

 tionate length of the spire, the principal whorl being more or less 

 ventricose : but in some it is sufficiently short to render the shell 

 trochiform. This circumstance, joined to the thickened and some- 

 what projecling base of the columella, induces me to believe, that 

 the proposed type of the genus has been mistaken by Lamarck for 



