342 ACHATINELLA MUSTELINA. 



On the south or Ocean side the range falls so precipitously 

 from the narrow crest that forest is lacking for the greater 

 part. Where the crest is wider, or butresses extend ocean- 

 ward, there is some shell country on the Ocean side of the 

 summit. I understand that this is the case in the Palihua 

 region, which I did not visit. Otherwise, the only tree-snail 

 forests on the south side are in the heads of the valleys under 

 the butresses and peaks. In the head of Makaha there is a 

 modified form of the Mokuleia mustelina, and a peculiar 

 special race, A. m. makahacnsis. In the head of Waianae val- 

 ley, under Kaala, I am informed that mustelina occurs. 



Further east the valleys of the south side look very arid, 

 and no tree snails have been reported. The forms from high 

 on the ridge, lymaniana and concavospira, have already been 

 noticed. 



The distribution of the several races is approximately indi- 

 cated on the accompanying map. 



40. A. MUSTELINA Mighels. PI. 63 ; pi. 62, figs. 1, 2. 



"Shell dextral, conical, dark brown with a light revolving 

 band at the suture, perforate ; whorls 7 ; convex ; aperture ob- 

 long; lip simple, acute. Length 1 inch, diameter nine-twen- 

 tieths inch. Rob. Waianai' (Mighels). 



Oahu : Entire Waianae range, in various varieties. 



Achatinella mustelina MIGHELS, Proc. Boston Soc. N. H., ii, 

 1845, p. 21. REEVE, Conch. Icon., vi, pi. 3, f. 21. PFB., 

 Monogr., iii, 458. THWING, Orig. Descript. Achatinella, pi. 1, 

 f. 9. Apex mustellina Migh., HARTMAN, Proc. A. N. S. Phila., 

 1888, p. 39. ? Achatinella vestita MIGHELS, Proc. Bost. Soc. 

 N. H., ii, 1845, p. 20. Achatinella multilineata NEWC., P. Z. 

 S., 1853, p. 138, pi. 22, f . 23. B [ulimella] multilineata Newc., 

 HARTMAN, Proc. A. N. S. Phila., 1888, p. 30. Achatinella 

 monacha PFR., P. Z. S., 1855, p. 3, pi. 30, f. 9 ; Monographia, 

 iv, 522. Achatinella monarcha Pfeiffer, THWING, Orig. De- 

 script., p. 186. 



The chief races and color-patterns of A. mustelina are as 

 follows : 



Form rather stout ; spire with slightly concave or straight 

 outlines. 



