ACHATINELLA ELEGANS. 167 



whorls 6, plano-convex, margined above ; suture well im- 

 pressed. Aperture subovate; lip white, expanded, sub re- 

 flected, somewhat contracted in its center, thickened within; 

 columella short, flat and lightly toothed. Color light and 

 dark-brown alternating, longitudinally arranged in lineations 

 or broad patches; sometimes with a white sutural band and 

 an additional one on the body-whorl. Length eighteen-twen- 

 tieths, diam. eight- twentieths inch." (Newc.) 



Oahu: Hauula (Newcoanb) ; Hauula, Kaliuwaa and Ka- 

 huku (Gulick) ; Hauula and Kaipapau (Baldwin). 



Achatinella elegans NEWC., P. Z. S., 1853, p. 149, pi. 24, 

 f. 57, 1854. 



This species differs from all forms of bulimmdes by its 

 streaked coloration, a pattern not found in bulimoides. It is 

 also more slender, in the average, but occasional specimens 

 are as broad and compact as bulimoides. 



It is said to be now extinct, having passed with the lower 

 forests of the Hauula region, but it was an abundant shell in 

 1850-55, when Newcomb and Gulick were collecting. Besides 

 the lots in these collections I have seen a beautiful series in 

 the collection of Mr. J. S. Emerson. 



Large series from Newcomb and Gulick, taken in Hauula, 

 show considerable variation in the pattern. Usually the shell 

 is streaked in the direction of growth lines with brown (wal- 

 nut-brown to brownish- vinaceous of Ridgway's Color Stand^- 

 ards), the shade variable, but usually appearing overlaid 1 

 with white, sometimes dull chestnut-brown. The typical 

 form as figured by Newcomb has the streaks cut by white 

 bands at suture and periphery as in pi. 28, fig. 13o-, but often 

 one or both of these white bands is lacking. Newcomb 's 

 description applies to the form shown in pi. 28, fig. 12. Be- 

 sides these prevalent patterns, there are a few additional 

 white spirals in some shells, and sometimes 1 the dark streaks 

 are reduced or blurred. Barely the streaks are confluent, the 

 brown color almost evenly diffused. There are also- a few 

 pure white shells (fig. 13c) . In a set collected by Dr. New- 

 comb I note rather indistinct dusky bands above and below 

 the periphery, sometimes parted by a light-brown peripheral 



