234 ACHATINELLA BELLULA. 



"For convenience the writer has divided this shell into 

 twenty-five color- varieties. Each of these color- varieties is 

 designated by a letter. The letters thus used are A-T and 

 V-Z. A very large number of intermediate specimens occur. 

 Some of these color-varieties have a very restricted range, be- 

 ing found on only three or four of the sub-ridges ; others are 

 found over nearly the whole range of the species. 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 easily recognized, as none 

 of the shells are marked with dark bands or lines. The shells 

 vary from white to yellow. The apex is white to light brown ; 

 never striped. The columella is usually white, sometimes pur- 

 ple. This group represents about 37 per cent, of A. multi- 

 zonata. Of this group 63 per cent, were found on lehua, about 

 16 per cent, on Straussia, and 17 per cent, on guava. 



"The second of these groups contains the color- varieties 

 I-M. The shells are white to yellow, sometimes marked with 

 brown. All the shells of this group are encircled at the per- 

 iphery by a dark brown band, or two brown lines. The apex 

 in every case is white or light brown. The columella is usually 

 purple, almost never white. This group is only found from 

 sub-ridges I-XIV. It contains nearly 19 per cent, of the speci- 

 mens of A. multizonata. Of this group 53 per cent, were 

 found upon lehua, 15 per cent, on Straussia, and 24 per cent, 

 on guava ; 48 per cent, of this group were found on sub-ridges 

 IX-XIII. 



"The third of these groups contains the color-variety N. 

 This color-variety is so distinct from all the other color-varie- 

 ties that it is thought best to place it in a group by itself. 

 All the specimens came from sub-ridges III-V, 62 per cent, 

 coming from sub-ridge IV. About 40 per cent, were found on 

 lehua, 21 per cent, on Straussia, and 27 per cent, on guava. 



"The fourth group contains the color- varieties 0-Q. This 

 group is distributed over nearly the whole range of the species. 

 It is absent, however, from sub-ridges IX-XI. The shells of 

 this group are striped with from four to fifteen lines or bands. 

 The apex is striped with a light brown band. The columella 



