74 PARTULINA, MAUL 



polished, the two last rapidly enlarged and inflated. Suture 

 impressed, columella yellow, stout and twisted. Color bright 

 gamboge yellow, with one white and three wide chestnut bands 

 beneath the suture, the latter visible from within the aper- 

 ture ; aperture round ovate, white, labium white, slightly 

 thickened within. Length 16, diam. 10, length aperture 8, 

 width 5 mm." (Hartm.) 



East Maui: Makawao (Baldwin) ; Makawao to Honomanu 

 (Baldwin). 



A.[chatinella] nattii Baldw. Nobis (Achatinellastrum) , 

 HARTMAN, Proc. A. N. S. Phila., 1888, p. 34, pi. 1, f. 3 

 (Achatinellastrum nealii in explanation of plate, p. 56). 

 THWING, Orig. Descriptions, p. 106. 



" This with the preceding, A. porcellana Newc., and A. 

 flemingi Bald. MS., and also A. wailuaensis Sykes, form a 

 group very similar in appearance and which run together " 

 (Thwing). 



P. nattii, of which we figure specimens from Baldwin, 

 differs from porcellana by its stouter contour and the posi- 

 tions of the bands, which are quite definitely located in 27 

 specimens examined. There is one brown band a short dis- 

 tance below the suture, another at the periphery, and a third 

 about midway between periphery and columella, this one usu- 

 ally being the widest. The peripheral band shows above the 

 suture on the spire, but there is no dark band or margin 

 along the suture. The bands vary in color from chestnut to 

 ochraceous. The ground may be white throughout, but it is 

 usually snow-white between the suture and upper band, and 

 elsewhere gamboge yellow. The embryonic shell is rarely 

 white, usually some shade of brownish-yellow with a white 

 line or band below the suture. About the end of the second 

 whorl this solid color splits into two bands which become the 

 upper and peripheral. 



The embryo and early whorls are quite distinctly engraved 

 spirally, but on the last whorl this sculpture is very weak. 

 The surface is glossy. The lip is white except where colored 

 by the bands, and the strong, oblique columellar fold is in- 

 variably white. Sutural margin usually set off by an. im- 

 pressed line. 



