114 PARTULINA DUBIA, OAHU. 



Oahu, among stones; Waianae, found on bushes (New- 

 comb) . Waimano, eastern ravines southwest of forest fence ; 

 eastern ravines of Waiawa; east side of stream, Kawaiha- 

 lona, in Waialua; also Makalia and Makua valleys, Waianae 

 range (Irwin Spalding). In knot holes and crevices of loose 

 bark of kukul trees. In Waimano on guavas. 



Achatinella dubia NEWC., Ann. Lye. N. H. of N. Y., vi, p. 

 23 (May, 1853) ; P. Z. S., 1853, p. 152, pi. 24, f. 65, 1854. 

 Achatinella platystyla GULICK, Ann. Lye. N. H. of N. Y., vi, 

 p. 196, pi. 6, f. 25, 1856. Achatinella pexa GULICK, Ann. 

 Lye. N. H. of N. Y., vi, p. 197, pi. 6, f . 26, December, 1856. 

 Achatinella fucosa Frick, LYONS, Hawaiian Almanac and An- 

 nual for 1892, p. 105, pi. 1, f. 15. A. morbida PPB., P. Z. S., 

 1859, p. 30. 



P. dubia is a foreigner in Oahu ; the strong spiral striation 

 and the pattern of the embryonic whorls show it to be a real 

 Partulina. Like Laminella, it seems to have wandered west- 

 ward just before the connection with the Molokai-Maui mass 

 was submerged. It is somewhat related to P. grisea and P. 

 thaanumiana of Maui, P. radiata Gld. also has a close re- 

 semblance, but in this the Partulina pattern has been lost 

 from the embryonic whorls, and the columellar fold is some- 

 what stronger. P. radiata, according to specimens in Mr. 

 Emerson's collection, is from West Maui. 



In his second account of this species Newcomb states that 

 it may be either dextral or sinistral, and that old specimens 

 exhibit " a flat, twisted tooth ". His type figure is copied, 

 pi. 24, fig. 9. This form has light girdles at periphery and 

 base, with elsewhere a confused zigzag pattern of purplish- 

 brown and white or cream. The narrow callus within the 

 lip is white. Length 19.5, diam. 11, aperture 9.8 mm., whorls 

 l / 2 . The smoothish and rather shining surface shows engraved 

 spiral striae throughout. The lower part of the outer lip and 

 the basal margin are very slightly expanded. Ten of the spe- 

 cimens of this typical form before me are dextral, one sinis- 

 tral. The last embryonic whorl has conspicuous zigzag white 

 stripes on a dark ground. PL 26, fig. 7, is a specimen re- 

 ceived from Newcomb. Other specimens, pi. 26, fig; 8, have 



