ACHATINELLA DECIPIENS. 149 



Oahu: Kahana, Kaaawa and Waikane (Gulick) ; Waiolu 

 (J. S. Emerson). 



Waiolu may be considered the type locality, as here the 

 typical form (pi. 32, figs. 11, Ha, 11&) occurred. It is closely, 

 .streaked with rather dull-green or chestnut on a light ground, 

 the streaks sometimes confluent. A wide subsutural white> 

 band (often denuded of cuticle) is frequently present. The 

 apex is not chestnut, as Gulick states, in any of the lot of over 

 a hundred from Ms collection, from all the localities men- 

 tioned above. Six out of a set of 56 from Kahana are dex- 

 tral, all others seen being sinistral. Specimens with streaked 

 pattern are almost mirror images of A. decipiens, but they 

 differ by having the aperture a little more oblique, the lip is 

 usually a trifle less thickened within, and the surface in the 

 average torrida is more corrugated. The lip usually has a 

 fleshy or brownish border. Specimens from Kaaawa (pi. 32, 

 fig. 9) are similar to those of Waiolu. 



A small set from Waikane is strongly corrugated, heavily 

 streaked, with a dark band below the suture (pi. 32, fig. 8) . 



In Kahana the shells are variable (pi. 32, figs. 10 to lOc?) . 

 Those having blackish streaks on a yellowish or chestnut 

 "ground resemble forms of other valleys. Others have one or 

 two black-brown zones and a white sutural band ; and in some 

 the blackish-chestnut color spreads over all but the earliest 

 whorls. The surface has very little gloss in this lot, Kahana 

 specimens in 'coll. C. M. Cooke are similar except that the 

 ground-'Color is greenish and the surface glossy. 



Length 18, diam. 10.7 mm. Kahana. 



Length 18.5, diam. 10.5 mm. Kahana. 



Length 17, diam. 10 mm. Kahana, 



Length 17.5, diam. 10 mm. Waiolu. 



Kaaawa-Hakipuu division ridge (pi. 32, figs. 12 to 12c). 

 In a very handsome series collected by Mr. Spa.ldlng the em- 

 bryonic whorls are light-brown, differing thus from the large 

 series of torrida in Gulick 's collection, in which the early 

 whorls are white or nearly so. The last whorl, fig. 12, is green, 

 streaked with a much darker shade, or similar, with two black 

 "bands and a white sutural band. Fig. 12c, black with a yellow 



