38 LEPTACHATINA, GROUP F. 



47. L. ARBOREA Sykes. PI. 1, figs. 5, 6, 7. 



"Shell ovately oblong; turrited, thin or somewhat thin r 

 dextral, corneous, very lightly longitudinally striate ; whorls 

 6-7, flatly convex, the last equal to % of the length of the 

 shell; suture well impressed; aperture quadrately ovate, with 

 the dextral margin slightly thickened, with the eolumellar 

 margin vertical, thickened, reflexed, furnished with a small 

 scarcely conspicuous fold. Length 8.0, diam. 3.6 mm." 

 (Sykes.) 



Hawaii: Kona at 4000 feet (Perkins); Olaa (Baldwin, 

 Thaanu) ; Hamakua, subfossil (Ancey) ; Kaiwiki (Thaa- 

 num). 



Leptachatina arborea SYKES, Fauna Haw., ii, 1900, p. 357, 

 pi. xi, fig. 21. ANCEY, Journ. of Malac. xi, 1904, p. 69. 



The plica is very inconspicous ; the color becomes lighter in 

 adult specimens, and then the polished, transparent gloss 

 disappears and the shell becomes of a straw color. Over thirty 

 specimens were collected by Mr. Perkins; they vary slightly 

 in shape, a few being broader in proportion to the length, 

 and having more inflated whorls. Mr. Baldwin sends me 

 the following note: "It is found on the candle-nut tree 

 (Aleurites moluccana), among the leaves of the bird-nest fern 

 (Asplenium nidus) , sometimes at the height of 30 or 40 feet. 

 All other known species of Leptachatina are terrestrial, living 

 under rocks or on dead leaves and decaying wood." 



48. L. SIMPLEX Pease. PI. 1, figs. 8, 9. 



"Shell dextral, somewhat thin, shining, imperf orate, abbre- 

 viately or elongaitely ovate, longitudinally lightly striate, 

 sometimes narrowly margined at the suture, corneous ; whorls 

 6, flatly convex; aperture vertical, ovate; columellar fold 

 white, basal, oblique, twisted; lip thickened. Length 8.0, 

 diam. 3-4 mm." (Pease.) 



Hawaii: Kona at 3000-4000 feet (Perkins); Waimea 

 (Thaanum, Lyons, Baldwin, Henshaw and Lyman) . 



Leptachatina simplex PEASE, Journ. de Conchyl. 1869, p. 

 170. Achatinella (Leptachatina) simplex PFR., Mon. Hel. 

 Viv., viii, p. 247. Leptachatina simplex HARTMAN, Proc. A. 



