ACHATINELLA TJENIOLATA. 131 



with almost equal propriety in tceniolata, viridans rutila or 

 viridans subvirens, or 'assorted into these several strains. 

 The fact seems to 'be that several forms, well differentiated 

 in pure colonies, have interbred in other places, forming hy- 

 brid ^colonies. Strictly speaking, t&niolat& is a subspecies of 

 A. viridans, because there is complete intergradation between 

 them ; but as the race is usually quite recognizable, it is here 

 'admitted as a species. In dealing with Achatinella it is im- 

 possible to be logical and at the same time preserve a practi- 

 cally useful classification. 



The color in Palolo shells varies from white to few-banded 

 or many-banded with light reddish-brown, apex and sutural 

 border white, or rarely the apex is purplish-brown, perhaps 

 stained from within (pi. 24, figs. 15, 16, Plalolo, Gulick coll.). 



Length 20, diam. 10.2 to 11.2 mm. 



Length 18, diam. 11.5 mm. (exceptionally obese). 



Length 21, diam. 10.8 mm. 



Length 21, diam. 11.8 mm. 



AB these shells agree well with Pfeiffer's description and 

 Reeve 's figure, Palolo may be taken as type locality. 



In some colonies the color-form rubiginosa Newc. (pi. 24, 

 fig. 19, Palolo, and pi. 25, figs. 13, I3a, Wailupe, all from 

 Gulick coll.) is prevalent, together with banded shells. In 

 this form the shell is suffused and streaked with rufous, a 

 band or line below the suture and a columellar patch usually 

 white. Typical tceniolata might be described as rubiginosa in 

 which white bands traverse the shell spirally, cutting the 

 dark color into bands. It has thus a more advanced pattern 

 than that of rubiginosa, and the white shells are still further 

 evolved, though the pattern is degenerate. 



According to Newcomb, rubiginosa has a light flesh-colored, 

 and tceniolata a brown or dark slate-colored animal and 

 mantle. In his later paper he admits the specific identity of 

 rubiginosa and tceniolata. 



In Waialae (pi. 24, fig. 14) and Wailupe some large lots 

 taken by Gulick are white or with but few spiral lines or none, 

 while in others the profusely banded and the rubiginosa type 

 of coloring prevails. PI. 25, figs. 13 to 13c are Wailupe shells 



