ACHATINELLA ABBBEVIATA. 123 



The viridans group is somewhat intermediate between the 

 byronii and the bulimoides series, but most nearly related to 

 the former by the frequent development of bright green 

 color, which none of the bulimoides series has. Besides the 

 following forms, one unrelated sinistral species occurs on the 

 southeastern ridges, A. fuscobasis, no. 11. 



1. A. ABBBEVIATA Reeve. PL 31, figs. 1 to 5a. 



' ' Shell ovate, somewhat ventricose, dextral ; whorls convex, 

 margined round the upper part ; spire rather short, obtuse at 

 the apex ; columella callous, twisted. Olive-yellow, with a 

 black-brown line at the sutures, lower part of the last whorl 

 very dark green, apex black.' (Reeve.) 



Oahu: Eastern ridge of Nuuanu to Niu. Palolo (Gulick 

 and others; type loc.) ; around edge of the crater, and Palolo- 

 Waialae ridge (Spalding) ; northwestern ravine, next to the 

 Palolo-Manoa ridge (Pilsbry & Cooke). Konahuanui (Bald- 

 win) ; eastern Nuuanu, perhaps washed down from Kona- 

 huanui ( Spalding) . W'aialae, Niu, and over the ridge in Kai- 

 lua ( Gulick) . 



Achatinella abbreviata REEVE, Conch. Icon., vi, pi. 3, fig. 

 19, April, 1850. PFR., Monogr., iii, 460; iv, 532; vi, 172. 

 BALDWIN, Catalogue, p. 5. SYKES, Fauna Hawaiiensis, p. 305. 

 THWING, Orig. Descr. Achat,, p. 81, pi. 1, f. 22. GULICK, 

 Evolution, Racial and Habitudinal, p. 41, pi. 2, f. 25. Acha- 

 tinella bacca Reeve, Conch. Icon., vi, pi. 6, f. 45, May, 1850. 

 GULICK, Evolution, Racial and Habitudinal, p. 41, pi. 2, f . 22. 

 Achatinella nivosa NEWC., P. Z. S., 1853, p. 132, pi. 22, f. 6 

 (Niu). Achatinella Clementina PFR., P. Z. S., 1855, p. 205; 

 Monogr., iv, 534. 



A. abbreviata differs from the viridans forms by its broad 

 contour, thin outer lip, smoother surface and different pat- 

 tern, yet is related to them by color and the faint traces of 

 corrugation noticeable in some specimens. It is a very dis- 

 tinct species. 



A. abbreviata is a common species around the crater of 

 Palolo valley, and on its bounding ridges near the heads of the 

 upper ravines. It lives by preference in the axils of ieie. Hot 



