AURICULELLA, OAHU. 95 



There is an oblique columellar fold and sometimes a lower 

 obtuse callous lamella superposed upon it, and more prominent 

 than the fold. In a few shells from the eastern side of Nuu- 

 anu, the parietal lamella forks near the outer edge one 

 branch normal in form and position, the other lower, thicker 

 and rounded, is curved and extends nearly to the insertion of 

 the columella. In some of the Nuuanu shells there is a weak, 

 fine and close spiral sculpture on the base. 



There are five color varieties of this species: the first and 

 most abundant is the typical color, a corneous chestnut, 

 streaked with a slightly lighter shade ; the second is of a uni- 

 form corneous color; the third a uniform very dark chest- 

 nut; the fourth chestnut, with a very broad dark band at the 

 periphery of the last whorl ; and the fifth with a narrow white 

 band at the periphery of the last whorl; this light band is, 

 sometimes margined, above and below, by two bands of a 

 slightly darker shade than the ground color. 



Mr. Borcherding, following Hartman's identification, gives 

 Kahanui, Molokai as the habitat. From his figure, his shell 

 seems to be a form of A. brunnea Smith. A. castanea has also 

 been stated to be from Maui, on Mr. Baldwin's authority; but 

 he confused this species with a chestnut variety of A. unipli- 

 cata. 



16. A. PETITIANA (Pfeiffer). PI. 28, fig. 8. 



' * Shell sinistral, conically turrited, smooth, glossy, pellucid, 

 corneous; spire elongate, apex somewhat acute; suture nar- 

 rowly margined; whorls 8, scarcely convex, the last nearly 

 equal to one-third of the length, rotund at the base ; parietal 

 wall of the aperture furnished with a spirally entering, acute, 

 elevated, white lamella; columella slightly twisted-dentate 

 above ; aperture oblique, semioval, thinly calloused with white 

 within; lip acute. Length 6.3, diam. 3 mm.; aperture 2.25 

 mm. long" (P/r.). 



Habitat unknown. 



Tornatellina petitiana PFR., Zeitschrift fur Malak., 1847, p. 

 149. KUESTER, Conchyl. Cab., Tornatellina, p. 153, pi. 18, 

 figs. 24, 25. Achatinella petitiana PFR., Mon. Hel. Viv., iv, p. 



