ACHATINELLA BELLULA. 231 



10 to 10d. The ground varies from white or maize yellow to 

 burnt sienna with chestnut streaks ; a sutural band is always 

 present, though often weak, and about one-third of the shells 

 have nearly black bands below and above the periphery, some- 

 times also around the columella. The upper band is often 

 reduced to a line, or pair of lines, frequently absent. The 

 many-banded forms of Nuuanu are wanting or very rare in 

 Pauoa. Similar forms extend up the Pauoa side of Mt. 

 Tantalus the eastern limit of the species. Hon. L. A. Thurs- 

 ton has taken it on the Manoa-Koolau ridge, its eastern limit 

 on the main mountain axis. It does not pass Mt. Olympus. 



In the head of Nuuanu valley similar forms occur, also with 

 patterns shown in pi. 48, figs. 3, 4, coll. by Dr. Cooke. Other 

 forms are figured from Waolani Peak and towards the head 

 of Waolani valley (pi. 48, figs. 13 to 16, coll. by H. A. P.). 



A series from top of ridge of a northern lateral valley of 

 Kalihi shows the usual patterns of Pauoa, etc., also a few 

 shells of a rare pattern, pi. 48, figs. 17, 18. 



Near the head of Moanalua the typical pattern was taken by 

 Dr. Cooke. This was probably on the eastern ridge, as the 

 shell is not found low in Moanalua. 



On the ridges extending into Nuuanu from the north- 

 western bounding ridge a form occurs, which though inter- 

 grading completely with bellula yet has a certain racial status 

 by reason of the prevalence of a copiously banded pattern. 

 This race has been defined by Mr. Baldwin as follows : 



A. bellula multizonata Baldwin. PL 48, figs. 5 to 12. 



"Shell dextral, imperf orate, moderately solid, elongately 

 conical, apex subacute, surface shining, striated with fine lines 

 of growth, under a strong lens showing very numerous, ex- 

 tremely minute decussating strias ; apical whorls smooth, 

 scarcely decussated. Color white, variously striped with nu- 

 merous dark brown lines and bands, some on the base and 

 others spiral. Whorls 6, lightly marginate above, convex; 

 suture lightly impressed. Aperture oblique, oval, white, the 

 dark bands of the exterior visible within; peristome acute, 

 thickened within, slightly expanded, white, the dark lines of 

 the exterior marked on the inner edge ; columella purplish 



