304 ACHATINELLA LEUCORRAPHE. 



main ridge, on map, p. 277). The Kaukinehua shell, pi. 59, 

 f. 10, is a dextral form of the same color-pattern, but another 

 lot (2095 coll. Spalding) contains similarly banded sinistral 

 shells only. 



Mr. Spalding 's no. 2042 from the ridge between South Kau- 

 kinehua and Waikakalaua (at 6 on map, p. 277), contains a 

 few specimens streaked like those of the southeastern ravines 

 of Waikakalaua (fig. 14a) ; others have a light buff ground, 

 with indistinct pale purplish vinaceous stains in streaks and 

 spirals, deepening to light violet-gray on the back; apical 

 spiral olive brown ; lip light pinkish lilac, pi. 59, fig. 9. Others 

 are white with dark spiral lines below, similar to pi. 59, fig. 

 11 b. This colony also is a hybrid between the streaked and 

 the banded forms. 



Still further southeastward, A. I. irwini is found on the 

 Waikakalaua-Kipapa division ridge. In a lot from two miles 

 above Waipio Mountain house (at 5 on map, p. 277), the col- 

 ony (no. 1986) is chiefly dextral and banded, sometimes with 

 dark subsutural border and reddish bands above the dark 

 ones, sometimes typical (pi. 59, fig. 12, coll. by Spalding) ; but 

 there are also some streaked shells, like those from lower down. 

 This is therefore a transitional hybrid or undifferentiated col- 

 ony. There are some very short shells, 15.6 x 12 mm., with 5% 

 whorls. 



Further down the same ridge, in the ' ' southeastern ravines 

 of Waikakalaua, half a mile above Waipio," pi. 59, figs. 14- 

 14&, Mr. Spalding collected a series containing some speci- 

 mens very close to the type of leucorraphe; differing mainly 

 in being sinistral (175 sinistral, 4 dextral in his no. 2328 from 

 Station 4 on the map), and in having a tinted lip and a 

 rufous or chestnut line below the suture, instead of a white 

 band. It is a pure race, showing only "fluctuating variation " 

 from dark to light. The dark shells have a summit colored ex- 

 actly like leucorraphe; later whorls with black or olivaceous- 

 black streaks and faint or distinct white spiral lines ; lip 

 tinted, fleshy brown. Length 18, diam. 22 mm. The lighter 

 shells have the apical spiral more of a russet-vinaceous hue, 

 and the stripes of the later whorls from cinnamon to walnut 



