28 PARTULINA, MOLOKAI. 



9. P. TESSELLATA (Newcomb). PL 6, figs. 12 to 21. 



"Shell sinistral, ovate-oblong, solid, with minute decussating 

 striae, color white or fawn-colored, variously striped or not with 

 black and chesnut bands, upper whorls always tessellated with 

 black and white; whorls convex, the last somewhat inflated; 

 aperture white or roseate, ovate, effuse below; columella short 

 and broadly callous; columellar lip broad and slightly reflected. 

 Length 1 to 1.1 inch; breadth 0.6 inch. 



" Body light gray, mantle slate color " (Neicc.). 



Molokai (Newc.): Kalae, Kealia, Kalawao, Kahanui, Maka- 

 kupaia, and Pelekunu valley (Meyer). 



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

 19, May, 1853; P. Z. S., 1853, p. 139, pi. 23, fig. 26; 1854, p. 

 311. PFR., Monogr.,iv, p. 516. SYKES. Fauna Hawaiiensis, 

 p. 319. THWJNG, Reprint Orig. Descript. Achat., pi. 2, f. 6. 

 Partulina tessellata Newc., BORCHERDING, Zoologica, p. 52, pi. 

 2, figs. 1 to 16, 1906. 



Out of 57 specimens before me, 53 are sinistral. The figure 

 is stouter than in the following species, and it differs from 

 virgulata constantly by the obliquely striped last whorl of the 

 embryo. The first 1 to 1J whorls are some shade of brown; 

 then broad, slightly retractive stripes of opaque white and dark 

 brown alternate to the end of the embryonic shell. A clouded 

 or zigzag-mottled pattern ensues on the first neanic whorl. The 

 umbilicus is narrowly perforate, and the surface has little gloss 

 or none, the dense, wavy, spiral lineolation being w r ell developed. 



Length 26, diam. 17.3, aperture 14 mm. 



Length 23, diam. 15.5, aperture 12 mm. 



The typical form probably came from Makakupaia (pi. 6 figs. 

 16, 18, and fig. 12 received from Newcomb). The ground-color 

 of the later whorls is whitish, more or less streaked with fleshy, 

 with a varying arrangement of dark spiral bands and lines; lip 

 light liver-brown. Rarely the bands are absent, the later whorls 

 being profusely streaked (pi. 6, fig. 17). 



At Kahanui most specimens have the post-embryonic whorls 

 uniform reddish-chocolate, by coalescence of the bands, or they 

 are banded with that color (figs. 13, 14, 15, 20), but some 



