248 ACHATINELLA LIVIDA. 



6, rounded, margined above ; suture distinct ; aperture sub- 

 ovate ; columella short, tuber culate ; lip acute, within mar- 

 gined, black ; aperture internally pure white ; exterior of shell 

 uniform pearly white. Length 11, width 8 twentieths inch. 

 District of Waialua. This shell in its general aspect is the 

 complete counterpart of A. mighelsiana of Pfeiffer. The lat- 

 ter species is from Molokai. This is clearly distinct, as may 

 be seen by a cursory examination of the two species' (Newc.}. 



Evidently an albino form. Most shells of this kind are not 

 pure white. They are white with narrow streaks of very 

 faint flesh color or very pale gray, often with a faint yellow 

 suffusion on the base. Last whorl somewhat flattened later- 

 ally, convex below the impressed subsutural line. Aperture 

 white or pale lilac, usually with a dark streak within the 

 margin. 



It varies to a form with yellow base ; often there is a rufous 

 subsutural line. It is somewhat intermediate between livida 

 and undulata, but has the shape of livida. There is a good 

 series from Wahiawa in coll. Dr. C. M. Cooke (pi. 53, fig. 11) 

 and others from Waialua, from Baldwin (pi. 53, fig. 12). 

 Named in honor of Mr. J. S. Emerson of Honolulu, who be- 

 gan collecting in the time of Newcomb. The name was ori- 

 ginally spelled " emmersonii' by Newcomb, but in his list of 

 1858 it was corrected to emersonii, and placed in the synonymy 

 of livida. The "subspecies" of livida must not be taken too 

 seriously ! 



24fe. A. LIVIDA RECTA Newcomb. PL 30, figs. 45 ; pi. 53, figs. 

 13 to 21. 



' ' Shell usually dextral, solid, pyramidal ; whorls 6, but 

 slightly rounded, margined above ; suture slightly impressed. 

 Aperture subovate ; lip simple, thickened within ; columella 

 short, twisting to unite with the inner lip. Color various, 

 usually yellow, plain or with two black bands on the last 

 whorl, one of which is lost in the aperture, the other becomes 

 sutural. The shell above described is peculiar for its solidity 

 and rigid aspect. It possesses none of the graceful curves 

 which give to this genus so much of its beauty. The largest 



