68 PARTULINA, MAUL 



the following species : A. casta Nc., curta Nc., livida Sw., por- 

 cellana Nc., recto Nc., saccata Pfr., undulata Nc., semicari- 

 nata Nc., and variabilis Nc. Gulick, in his classification of 

 1873 restricted it to Lanaian species, giving Partulina varia- 

 bilis Newc. as an example. I think it may with advantage be 

 enlarged to include species of Molokai and Maui which seem 

 related. 



Series of P. porcellana. MAUI. 



Glossy shells with weak spiral s-triation ; uniform or with 

 color in bands, usually few in number and well contrasted; 

 the embryonic shell is banded above or below the suture or 

 is plain, and has no longitudinal or oblique markings (except 

 in P. mutabilis) . 



These medium-sized or small shells have much the appear- 

 ance of Achatinellastrum, but various indications the char- 

 acteristic decurrent sculpture more or less visible on all the 

 forms, and the vanishing zebrine stage in P. mutabilis lead 

 me to consider them modified Partulinae. This is also the 

 view taken by Mr. Baldwin, and suggested in Hyatt's Ms. 

 Other authors have grouped part of them in the Oahuan sec- 

 tion Achatinellastrum. 



37. P. MUTABILIS Baldwin. PL 20, figs. 1 to 7. 



Shell dextral or sinistral, minutely perforate, narrowly 

 conical, the sides slightly concave, apex rather obtuse; solid, 

 rather glossy, striatulate and under the lens showing weak, 

 rippled spiral striation. " Color varying from pure white 

 to dark fulvous, often variously striped with brown lines and 

 bands ' ' ; usually pale buff-yellow or whitish with numerous 

 chestnut spiral lines and bands, or snow-white throughout;, 

 the last embryonic whorl frequently striped longitudinally. 

 Suture generally margined below. The aperture is small, 

 white, lip very narrowly thickened within ; columellar lamella 

 white, rather strong, thick and oblique. 



Length 17, diam. 8.8, aperture 7.5 mm. ; 6^4 whorls. 



Length 16.3, diam. 9.3, aperture 7.8 mm. ; 6 whorls. 



West Maui : Waiehu valley. 



