PARTULINA, SECTION PERDICELLA. 21 



Achatinella zebrina PFR., P. Z. S., 1855, p. 202 (1856); Mono- 

 graphia, iv, 561. A. zebra No., BALDWIN, Catalogue, p. 7. 



''Related to A. ornata Nevvc. , but dextral and quite distinct 

 in the characters of the aperture ' (Pfr.). 



This species is known to us by specimens collected by Mr. 

 Baldwin. About If whorls at first are uniform light reddish 

 brown. The next half-whorl has wide alternating, more or less 

 forwardly-descending stripes of white and dark brown. After 

 that, the stripes become narrower, more sharply defined, and 

 more or less irregular or dislocated, the light and dark stripes 

 being about equal in width. The ground remains white nearly 

 to the base in some shells, in others becoming coffee-tinted, 

 darkest at the base. The spiral striation of the embryonic shell 

 is extremely delicate. The interior is purplish in fully adult 

 shells. The columella has a rather heavy callous fold, situated 

 high, or sometimes heaviest at the lower end, but there is no 

 lamella properly speaking. The axis is imperforate. Length 

 13.2, diam. 7, aperture 6 mm. 5J whorls. 



P. zebrina differs from P. mauiensis chiefly by the much 

 more prominently folded and calloused white or flesh-tinted 

 columella. 



6. P. FULGURANS (Sykes). PL 5, figs. 1 to 4, 7. 



Shell subperforate, dextral, ovate-turrited, glossy, closely 

 sculptured with spiral lines under a lens, whitish, very elegantly 

 marked with zigzag chestnut stripes. Suture moderately im- 

 pressed, the apex rather obtuse. Whorls 5^, plano-convex, 

 the last two-thirds the length of the shell. Aperture ovate- 

 piriform, lilac within; right margin of the peristome simple, 

 columellar margin somewhat reflexed; columellar fold twisted, 

 somewhat projecting, moderate, rapidly ascending. Length 16, 

 diam. 8, length aperture 8.1 mm. (Sykes). 



East Maui: Makawao to Huelo (Baldwin). 



Achatinella zebrina Pfr. , BALDWIN, Catalogue p. 8, not of 

 Pfeiffer. Perdicella zebrina Pfr., BORCHERDING, Zoologica xix, 

 p. 77, pi. 4, f. 19. Perdicella fidgurans SYKES, Fauna Haw- 

 aiiensis, Mollusca, p. 329, pi. 11, f. 5, 1900. 



"This very pretty shell is akin to P. zebrina Pfr., but may 



