52 LAMINELLA. 



The shell is solid, resembling flavescens in texture. It is 

 rather sharply irregularly striate, very faintly pink under a 

 very thin naples-yellow cuticle, which is partly deciduous, 

 the spire cinnamon, darkening to the apex. The whorls are 

 closely coiled, the last showing a distinct angle in front, and 

 very shortly descending near the aperture. Suture well im- 

 pressed. The columellar lamella is strong and subhorizonial. 

 Length 15, diam. 9.5, aperture 7.75 mm. ; 6 whorls. 



Genus LAMINELLA Pfeiffer. 

 LAMINELLA GRAVLDA (Fer.). Vol. XXI, p. 327. 



This fine snail lives on the leaves of the olond, which is 

 often referred to by collectors as the "gravida plant." I 

 never saw them on any other plant. They are extremely 

 timid, and drop to the ground at the slightest jar. 



On inspection of the very large series in the Bishop 

 Museum, the Irwiii Spalding and the Thaanum collections, 

 it is obvious that there are several local races, which it is de- 

 sirable to recognize by name. 



The subspecies of L. gravida from west of Nuuanu live in 

 widely separated colonies, and are perfectly distinct from one 

 another in characters. They might be ranked as species, be- 

 ing more distinct than many species of Achatinella. Those 

 from Nuuanu eastward occupy contiguous areas and are less 

 clearly differentiated from each other. 



L. GRAVIDA DIMONDI (C. B. Adams). Vol. XXI, pi. 55, f. 1, 



2, 4, 5. 



The cuticle is bone-brown to black, more or less extensively 

 deciduous in angular patches, exposing the cream or pinkish 

 buff or almost white under-tint. Aperture white or pinkish 

 buff within. Embryonic whorls olive-buff or some shade of 

 brown. Size larger than in Pauoa gravida. 



Length 26, diam. 4, aperture 2.3 mm. 



Length 25, diam. 14.5 mm. 



Oahu: Wailupe, Waialae (fig. 2, Cooke coll.), Palolo (figs. 

 1, 4, A. N. S. P.), Manoa, Mt. Konahuanui and upper Nuuanu 

 (fig. 5, Cooke coll.). 



