ACHAT1NELLA VITTATA. 293 



to 11, east slope of Waolani Peak, coll. by Pilsbry, and figs. 

 9, 9a coll. by Cooke. The same forms extend around the head 

 of Kapalama and onto the Kalihi ridge. 



In the same colony from the west ridge of Nuuauu there 

 are exceptional forms with clove-brown, sepia, russet, chest- 

 nut or yellow ocher bands, pi. 57, figs. 140, 14c Cooke coll., or 

 chocolate, delicately streaked and spirally lineolate with white, 

 with a tawny sutural band as in A. vittata, pi. 57, fig. 14& 

 Cooke coll. All of the above are sinistral. Some of these un- 

 usual color-patterns of simulans most resemble vittata. One 

 of them also was selected to form the supposed species A. albo- 

 fasciata. 



Dextral form. On a few trees in a little ravine on the west- 

 ern ridge of Kapalama, and in the midst of the sinistral col- 

 ony, Mr. Spalding found a colony of dextral simulans. A 

 light ochraceous buff specimen is shown in pi. 57, fig. 12, but 

 dark-banded shells also were taken. Mr. Gulick found similar 

 ocher-banded dextral shells in ' ' Kalihi ' -possibly the same or 

 an adjacent locality. 



Apex albofasciata Smith was based, as Mr. Thwing has al- 

 ready intimated, upon a tawny-banded individual of simu- 

 lans, such as are found on the west ridge of upper Nuuanu 

 with the more abundant typical form. The original figure is 

 photographically reproduced on pi. 57, fig. 13. The original 

 description follows. 



"Apex albofasciata Sm. Shell sinistral (sometimes dex- 

 tral), perforate, globose-conic, lightly striated with growth- 

 lines ; of a bay color, streaked with darker ; the last whorl 

 encircled with two or three white zones (the median always 

 wide) ; apex white; whorls 6, the first four rather flat, the 

 rest convex, suture distinctly margined, white ; aperture red- 

 dish within ; peristome slightly dilated, thickened within, red- 

 dish, marked in the middle with the white band of the out- 

 side ; columellar fold strong, rosy, white at the apex. Length 

 19, diam. 12!/2 mm. 



Habitat, Sandwich Islands. This species, of which there 

 are several specimens in the British Museum collection, some 

 sinistral and others dextral, I am unable to locate with any 

 yet described' (Smith}. 



Mr. Smith informs me that "the apical half- whorl is tinted 

 with pale brown.' 



