ACHATINELLA DECORA. 331 



38. A. DECORA (Ferussac). PL 61, figs. 1 to 6. 



The shell is imperf orate, sinistral, solid, ovate-conic, outlines 

 of spire straight or slightly concave. Suture superficial, with 

 the usual impressed line defining a margin, bordered below by 

 a white band. Embryonic whorls cream color (varying from 

 almost white to light ochraceous buff), with the tip often a 

 little darker ; first neanic whorl often blotched with chocolate, 

 or with a chocolate band, extending as far as the last whorl. 

 Last whorl variously marked. (1) Copiously streaked with 

 chestnut, bay or blackish chocolate on an ochraceous buff 

 ground. (2) The same, with a light subperipheral band. (3) 

 Lightly streaked with chestnut over ochraceous buff, with dark 

 bands below the white sutural band, at the periphery and 

 around the columella, or otherwise placed. (4) Cream or 

 ochraceous buff, not streaked, having a few narrow dark 

 bands, lip nearly white with yellowish edge. 



Surface weakly striate, not highly polished. Aperture 

 bluish white within, the lip expanding slightly, well thickened 

 within, and pale flesh color. Columellar fold moderate, nearly 

 white. 



Length 21.3, diam. 13, aperture 11 mm. ; 6% whorls. 



Length 19, diam. 13, aperture 10.3 mm. ; 6% whorls. 



Length 17.2, diam. 12.8, aperture 9.7 mm. ; 6 whorls. 



Length 20, diam. 12, aperture 9.5 mm. ; 6% whorls. 



Oahu : Kawailoa and Wahiawa (Gulick) . Helemano ; Gulch 

 east of Opaeula; gulch west of Helemano; and eastern spurs 

 of Kawaiholona, on kukui trees (Irwin Spalding). 



Helix decora FER., Tableaux Systematiques des Animaux 

 Mollusques, etc., p. 56, no. 430 (1821), based solely upon 

 Turbo lugubris sinistrorsus Chemnitz, Conchylien Cabinet, xi, 

 p. 307, pi. 213, f. 3014, 3015. Achatinella decora var. b, PFR., 

 Monogr., iii, p. 465. Apex decorus Fer., GULICK, P. Z. S., 

 1873, p. 82 (under A. tumefactus). Achatinella decora Fer., 

 SYKES, Fauna Hawaiiensis, p. 301, 1900. Not A. decora 

 Reeve, or of most writers and collectors. 



Achatinella perversa SWAINSON, Quarterly Journal of Sci., 

 Lit. and Art, iii, 1828, p. 84; Zoological Illustrations, iii, p. 



