346 ACHATINELLA MUSTELINA. 



color of the last whorl, sometimes producing a real multilin- 

 eata pattern. The embryonic whorls are typical in some lots, 

 the first neanic whorl bro\vn or marked with brown, as in 

 shells taken by Mr. Spalding in the northern ravines of Hale- 

 auau; but in a lot from the eastern ridge of Haleauau the 

 embryo is bicolored, ochraceous with a white band below the 

 suture, the tip fleshy. PL 63, figs. 6, 6a from the Thaanum 

 collection. Most lots from Haleauau include both dextral and 

 sinistral shells. 



Pukuloa. Several colonies where Mr. Spalding collected, 

 Pukuloa, between Mikalua Gap and Pukuloa, and on Kalena 

 Peak, have forms resembling those of the western ridge of 

 Popouwela, plain or multilineate, the sutural border some- 

 times as narrow as in Mokuleia. Also specimens approaching 

 bicolor by widening of the sutural white band. 



On the Leilehua-Waialua division ridge the colony found 

 was all dextral, with a more or less dark basal tract not ex- 

 tending to the periphery (pi. 63, fig. 7, coll. by Spalding). In 

 a colony from the same neighborhood, but nearer Kaala, no. 

 1646 of Spalding 's collection, there are a few sinistral shells; 

 very few have a dark basal patch. 



Popouwela. On the western ridge the shells are mainly 

 sinistral, 43 sinistral to 14 dextral in one lot I collected. 

 The embryonic whorls are bicolored, the upper half of each 

 buff, lower half white, or rarely they are all ochraceous or all 

 very pale buff, the tip is always slate-violet. The last whorl 

 is wood brown to light buff or almost white, with faint oblique 

 darker striae and olive-brown spiral lines and bands, or rarely 

 very dilute purplish-gray bands (pi. 63, figs. 9-9&, northern 

 colony of the western ridge of Popouwela). Further up the 

 ridge there are more white shells with faint or pale neutral 

 gray streaks, with or without blackish spiral lines (pi. 63, figs. 

 8, 8a). 



PL 63, figs. 10 to lOc. Near the foot of the third small 

 ridge eastward there is a large colony in which the color is 

 Mars brown with blackish bands and a wide, snow-white 

 sutural band, occupying half of the penultimate whorl. Only 

 18 in 173 found by me are dextral. Among the dark shells are 



