46 PARTULINA, MAUI. 



a streak of darker brown on the left side of each white stripe. 

 In some shells the white is reduced to irregular spots on the last 

 whorl. These patterns are figured. The surface is rather 

 glossy, showing fine spirals under the lens; suture margined 

 with a white cord. Axis imperforate. Length 22, diam. 12^, 

 aperture 10 mm. ; 6f whorls. 



The shade of brown varies a good deal in different lots. 

 Lahaina specimens are figured, pi. 10, figs. 14 to 16, and pi. 

 13, fig. 13. In pi. 13, figs. 10, 11, 12, we figure three sinistral 

 specimens from Honokowai, collected by Mr. Thaanum. 



Var. undosa Gulick (pi. 10, figs. 17, 18, 19). Usually more 

 slender than perdix, the spire longer, stripes generally narrow, 

 sometimes pale and linear; distinctly perforate. 



Length 22, diam. 11.8, aperture 10.6 mm.; 6J whorls. 



Length 20, diam. 11.9, aperture 10.9 mm. 



Length 21, diam, 11, aperture 9.6 mm. 



Mountain ridges of Waihee, on the ilima (Sida), ki (Cordy- 

 llne terminalis) and other low bushes (E. Bailey). 



21a. P. perdiic pyramidalis (Gulick). PI. 10, fig. 20. 



"Shell dextral, very rarely sinistral, imperforate, pyramidal, 

 rather solid, shining; chestnut or ash brown, with a white or 

 yellowish band encircling the base, with oblique white and 

 brown markings on the second and third whorls, bluish-white 

 within the aperture. Apex subacute; spire regularly conical, 

 sometimes decollated. Whorls 6|, convex, margined with white; 

 finely striated transversely, and microscopically decussated with 

 faintly impressed wrinkled spiral lines; the last regularly 

 rounded, equal to 65 hundredths of the length. Columellar fold 

 well developed, white, oblique. Aperture rather oblique, semi- 

 oval; peristome thickened within, very slightly reflected; with 

 columellar margin dilated, adnate or slightly detached; parietal 

 margin wanting. 



" Length 21.6, breadth 11.4 mm., aperture 9.66 mm. The 

 dimensions of a large specimen are as follows: Length 23, 

 breadth 12, aperture 10 mm. Average weight 5.7 grains." 

 (Gulick). 



West Maui: Lahaina, on trees (S. T. Alexander); Huelo 

 (Baldwin); Waihee (Perkins). 



