l60 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. IO3 



Group of A. a.^ aloha Pilsbry and Cooke 



ACHATINELLA APEXFULVA ALOHA Pilsbry and Cooke 

 Plate 2, Figure 31 ; Plate 12, Figures i-2a 



Achatiriella apexjulva aloha Pilsbry and Cooke, Man. Conch., vol. 22, p. 330, 

 pi. 60, figs. 15-150 (only), 1914. 



To quote from Pilsbry and Cooke : 



The shell is dextral, rather small and light, often perforate; white, with 

 unequal spiral bands of pale cinnamon pink on the penultimate and last whorls, 

 deepening to brownish vinaceous or orange-cinnamon behind the lip, where they 

 usually become confluent. The embryonic whorls and a broad band below the 

 suture are zvhite. Peristome moderately thickened within, light purplish vina- 

 ceous, the columellar fold paler. 



Length 18.5, diam. 12.7 mm. ; 6^ whorls. 



Length 19.2, diam. 11. 9 mm.; 6\ whorls. 



Crest of the division ridge between the two branches of the Kaukinehua 

 [Kaukonahua] stream, above the Wahiawa head-gates cabin, the colony extend- 

 ing to within | mile of main ridge; on mokihaua [mokihana?], pua VOsnianthus\, 

 maile [Alyxial, and alani [Pelea]. Cotypes in collections A.N.S.P. and Bishop 

 Mus., from No. 3813 Irwin Spalding Coll. 



By its cleanly-defined pinkish bands, absence of streaks and white embryo, this 

 snail is well distinguished from other forms of A. apexjulva. It is very constant 

 in a large series collected by Mr. Spalding, except for a mutation which occurs 

 in the same colony. This is illustrated in pi. 60, fig. 16, and differs from the 

 normal A. a. aloha only by having the bands chocolate-black. 



A. a., aloha is always dextral. It is plentiful in a limited locality on one 

 ridge, which is isolated by perennial streams on both sides, and mauka (toward 

 the mountains) is shut in by the precipitous side of the main Koolau Range. 



Distribution, area lOO?: Kaukonahua, Wilder, BBM 50561; 

 North Kaukonahua Stream, Thurston, BBM 130740. Lectotype 

 BBM (pi. 12, fig. i). Pilsbry and Cooke plot this locality in the region 

 of area 100 ?. This locality has not been collected in recent years. Since 

 their information w^as obtained from Spalding, I believe that the 

 Wilder and Thurston shells can be plotted as coming from the same 

 place because these men either collected together or told each other 

 about their localities so that they could visit them separately (fig. 5a, 

 p. 105). 



The usual form and color pattern (pi. 2, fig, 31) on 87 percent of 

 the shells in the Wilder collection has the first postembryonic whorl 

 and penultimate white, penultimate banded just above the edge of 

 the periphery with pale ochraceous salmon, last whorl pale ochraceous 

 salmon with a few faint broken lines of white, sutural and subsutural 

 bands white ; lip tinged with pale grayish vinaceous ; columella callus 

 white. Length 19.2 mm., greater diameter 13.2 mm., spire height 

 9.6 mm. 



