NO. I ACHATINELLA APEXFULVA DIXON — WELCH 65 



The dextral shells of locality 187 are not so obese as those of locality 

 184. The usual form and pattern of a dextral (pi. i, fig. 35) measures : 

 Length 19.8 mm., greater diameter 12.4 mm., spire height 10.5 mm., 

 embryonic whorls white ; postembryonic whorls shade from cream 

 color to naples yellow on the last whorl, last whorl below the periphery 

 mustard yellow, banded at the edge of the periphery with a faint band 

 of ochraceous tawny, below the periphery with tawny, behind the 

 edge of the lip a streak of black. 



The obese and banded form of the shell (pi. 5, fig. 21) measures: 

 Length 18.9 mm., greater diameter 13.3 mm., spire height 8.8 mm. 

 Postembryonic whorls mustard yellow, faintly lined on the last whorl 

 above the periphery with cinnamon bufif; impressed sutural band 

 russet ; last whorl at the periphery and below banded with ochraceous 

 tawny, russet and mars brown about the base, behind the edge of the 

 lip a streak 2 to 3 mm. wide of black. A narrow elongate form and a 

 yellow color pattern (pi. 5, fig. 21a) has the postembryonic whorls 

 naples yellow deepening to yellow ochre on the last whorl, lined above 

 the periphery of the last whorl with naples yellow. Length 20.2 mm., 

 greater diameter 12.0 mm., spire height ii.i mm. 



There is some doubt in my mind concerning the accuracy of some 

 of the material collected by Meinecke in localities 184 and 187. After 

 comparing the material with his more recently collected shells found 

 after 1933, I believe that the early lots of shells collected prior to 

 1933, and plotted from memory, have been misplotted. I have taken 

 the liberty of arranging the sequence of areas in a probably correct 

 order, taking the 1933 and later collected material to be correct. In 

 doing so I may have made an error, and I hope that some student of 

 Hawaiian tree snails may check the order of color variations on this 

 ridge. The change in form from narrow dextral shells in area 28 to 

 sinistral obese ones in locality 184 and finally to narrow dextrals 

 again in locality 187 is most interesting if true. On the variation of 

 form, one would be led to suppose that the sequence is area 28, locality 

 187, area 29, locality 184, and finally locality 185, locality 188, and 

 area 31. 



In locality 185 the color pattern and form of the shells is similar 

 to that of locality 184, the only difiference being that a few specimens 

 (3 out of 10) have a white ground in locality 185, while in area 184 

 no white color patterns occur. The single shell from 188 has an en- 

 tirely yellow color pattern. I have considered this locality the border- 

 line extremity of the typical aureola area with a few specimens show- 

 ing the lighter color patterns of area 31. 



