112 PARTULINA, MAUL 



within. Suture well impressed ; umbilicus open. Color above 

 grayish- white mottled with light brown, below ashy-gray; the 

 body-whorl encircled by a narrow white band. Length 16, 

 diam. nine-twentieths of an inch " (Newc.). 



Maui: Makawao (Newcomb, type loc.). 



Achatinella grisea NEWC., P. Z. S., 1853, p. 153, pi. 24, f. 

 66. PFR., Monogr., iv, 518. A. dubia var. b PFR., Malak. 

 Bl., 1854, p. 117. 



The conic spire rather slender above, and the weak cohi- 

 mellar fold give this shell somewhat the 'contour of A. physa 

 Nc. of Hawaii. After the smooth first whorl, two are very 

 closely and deeply striate spirally. The spirals become weaker 

 on the last whorl. 1^ apical whorls are pale brownish white. 

 Then broad, irregularly zigzag brown stripes usually appear, 

 and on the last embryonic whorl a dense pattern of narrow 

 zigzag lines (pi. 18, fig. 8). After 3^ embryonic whorls the 

 neanic pattern of oblique streaks sets in. These become zig- 

 zag or irregular on the later whorls. The last whorl is per- 

 forate, narrowly banded with white, dark fawn color below 

 the band. In two specimens I have seen there is no band. 

 The aperture resembles that of P. dwightii except that the lip 

 is far less thickened and the columella moderately twisted 

 with no callous fold superposed upon the convexity. Figures 

 are from Makawao shells received from Newcomb. 



Length 20, diam. 11.5 mm. 



Length 21.2, diam. 12.5 mm,; whorls 6^. 



P. grisea is not closely related to any other Mauian snail, 

 but it has much in common with P. dwightii of Molokai, the 

 shape of the spire, pattern and color being nearly alike in 

 the two species. The pattern of the last embryonic whorl is 

 different, and P. dwightii has a stronger columellar fold. It 

 is one of the rarest Mauian shells, and as yet entirely un- 

 known to Hawaiian conchologists of the present day, although 

 the Makawao district has been thoroughly worked over. It 

 may be extinct. 



50. P. THAANUMIANA Pilsbry, n. sp. PL 18, figs. 6, 7. 



The shell is sinistral, narrowly umbilicate, thin, ovate-conic, 



