Achat 1)1 ell a Midtizonata . 73 



Color-variety W. 



Shell a rich mahogany brown; apex in most cases white, in 

 other cases striped as in O; in the latter cases the snture is marked 

 with a dark brown line; columella purple; 18 specimens. This 

 color-variety is confined to the last two sub-ridges. All the speci- 

 mens except three were found on lehua. 



Color-variety X. 

 Shell a rich mahogany brown, as in W, but striped with numer- 

 ous dark brown lines ; apex banded as in O; suture marked with 

 a dark brown line; columella purple ; 15 specimens. This color- 

 variety was found only on sub-ridges X\"-XVII. All were found 

 on lehua. 



Color-variety Y. 



Apex white, base a dark brown shading into a pinkish purple 

 near the suture ; this lighter color is continued on the spire ; colu- 

 mella purple ; a single specimen. This specimen came from sub- 

 ridge XVII. It was found upon lehua. 



Color-variety Z. 



Shells variously colored or striped ; apex striped with a dark 

 brown band ; the lower whorls are marked as in B, K and R ; suture 

 marked with a brown line; columella purple ; 73 specimens. In 

 this color-variet}' there has been considerable "lumping". All the 

 specimens agree in having the apex striped with a very dark band. 

 In all cases this has occurred in color-varieties which usually have 

 a white or light brown apex. This color-variety is almost confined 

 to sub-ridges I and II. There are only three exceptions out of 73 

 specimens; these came from sub-ridges III, VII and XI. Of this 

 color-variet}- 70 per cent, were found upon guava. 



These color-varieties fall naturally into seven groups. The first 

 of these groups, and also the largest, is made up of the color-varieties 

 A-H. It is easih' recognized, as none of the shells are marked 

 with dark bands or lines. The shells var}^ from white to yellow. 

 The apex is white to light brown; never striped. The columella 

 is usually white, sometimes purple. This group represents about 



