16 PARTULINA, SECTION PERDICELLA. 



a 1 . Maui. 



b. Shell sinistral, with long, straight-sided spire, finely 

 zigzag-streaked or speckled, with a dark peripheral 

 band. P. ornata, no. 2. 



b l . Shell dextral, oblong or ovate-conic. 

 c. Columellar fold distinct, convex. 



d. Pattern of longitudinal chestnut lines, base 

 umber with a spiral umber band; col. fold 

 prominent; length 14 mm. P. zebra, no. 3. 

 d l . Boldly striped or zigzag-striped, without a spiral 

 band; columella white or pink, with a rather 

 strong fold. 

 e. Length about 13 mm. ; form narrow. 



P. zebrina, no. 5. 

 e\ Length about 15-16 mm. ; form wider. 



P. falgurans, no. 6. 

 c 1 . Columellar fold very weak. 



d. Lip and columella brown; diam. not much over 

 half the length. P. mauiensis, no. 4. 



d 1 . Columella white or tinged with purple-brown; 

 diam. nearly two-thirds the length. 



P. kuhnsi, no. 7. 



1. P. HELENA (Newcomb). PI. 4, figs. 1 to 7. 



Shell sinistral, ovate-conical, with finely decussating stria? ; 

 rufous, alternating with broad longitudinal zigzag white lines 

 covering the entire shell ; the last whorl often encircled by a 

 white band. Whorls 5, rounded ; suture deep, simple. Aper- 

 ture ovate, columella slightly callous. Length 0.5, breadth 0.22 

 inch (Newcomb). 



Molokai, on the Ti tree (Newcomb). Kamalo to Kalae 

 (Baldwin); Kalae and Makakupaia (Perkins); Kealia (Meyer). 



Achatinella helena NEWC., Annals Lyceum of Nat. Hist, of N. 

 Y. vi, p. 27, April, 1853; P. Z. S., 1853, p. 151, pi. 24, f. 63; 

 1854, p. 311. PFR., Monogr., iv, 561. A. (Partulina) h., 

 BALDWIN, Catalogue p. 6. Perdicella helena Nc. , PEASE, P. Z. S. 

 1869, p. 648. SYKES, Fauna Hawaiiensis, p. 330. BORCHERD- 

 ING, Zoologica, p. 75, pi. 4, f. 17 (Kealia), and 18 (Maka- 



