232 ACHATINELLA BELLULA. 



brown, terminating in a strong, oblique, tortuous fold. Length 

 18, diam. 10 mm. Nuuanu Valley. 



"Animal, when extended in motion, longer than the shell. 

 Mantle brown, lighter on the outer edge. Foot above and be- 

 low light brown ; posterior portion tapering. Tentacles long 

 and slender; these, with the head above, slate color.' 

 (Baldwin). 



"A great variety of transition forms occur between this 

 species and A. bellula Smith, which is found on the neighbor- 

 ing mountain ridges of Nuuanu Valley, and is a much larger 

 shell. The animals of the two extremes are specifically dif- 

 ferent. The mantle of the latter is black, whereas that of the 

 former is brown, and that of the intermediate forms varies 

 from black to brown. ' (Baldwin). 



Specimens of the type lot are figured, pi. 48, figs. 5, 6. 



Dr. C. Montague Cooke has published a detailed study of 

 multizonata from which the following extracts are quoted: 

 "Nuuanu valley has a north-easterly trend. The sides are 

 more or less precipitous and rise from a few hundred to more 

 than two thousand feet above the bed of the valley. The 

 sides are covered by a low dense mass of trees, shrubs, ferns 

 and creepers. Extending into the valley, at about right angles 

 to the sides, are numerous sub-ridges. The upper portions of 

 these sub-ridges and of the valleys between them are also over- 

 grown with a dense mass of vegetation. The lower portions 

 and also the bed of the main valley are covered with the intro- 

 duced 'Hilo grass' (Paspalum conjugatum) with here and 

 there clumps or isolated individuals of lehua (Metrosideros 

 polymorpha), Straussia, guava (Psidium guayava), etc.- 

 There are about twenty-three of these sub-ridges, which are 

 more or less parallel to one another. In some cases the foot 

 of a sub-ridge expands into a more or less undulating slope. 

 In numbering these sub-ridges the numbers begin at the head 

 of the valley. 



"A. multizonata is found on all the upper 17 sub-ridges, a 

 district of about a mile in length, and from 100 to 400 yards 

 in breadth. There are no permanent streams in any of the 

 valleys between these sub-ridges. Two of these valleys usually 



