180 ACHATINELLA, SECT. ACHATINELLASTRUM. 



This is the western terminal member of the sowerbyana 

 series. In a considerable lot seen it is always dextral. Ex- 

 cept in direction of coil and some details of banding it has a 

 close resemblance to laiensis. Some of the white shells have 

 the lip white, others 1 having it purple-brown. 



Further up, on the Kahuku division ridge, the same sub- 

 species has been taken by Mr. Spalding, 3558 of his col- 

 lection, 108129 A. N. S. P. The shells are pure white, or light 

 brown with dark sutural line and bands ii, iii, and the colu- 

 mellar region are narrowly dark; band ii being narrow, iii 

 wide and darker. 



This subspecies is quite unlike A. s. roseoplica except that 

 both are dextral. 



13d. A. SOWEBBYANA ROSEOPLICA P. & C., n. s-ubsp. PL 34, 

 fig. 12. 



The shell is dextral, oblong-conic, rather solid, white under 

 a greenish-yellow (sulphine-yellow) cuticle which is slightly 

 streaked and is deciduous in a band below the suture and on 

 the spire; apex white or pale-brown. Whorls but slightly 

 convex. Lip-rib narrow, white or pale pink, the columellar 

 fold roseate. 



Length 18, diam. 9, aperture 8.2 mm. ; 6 whorls (A. N. S.) . 



Length 17.2, diam. 8.7, aperture 7.8 mm. (Bishop IVCus.) 



Opaeula, above forest- fence line, type loe. ; also on the 

 northeastern division ridge between Opaeula and Kawaiha- 

 lona, Irwin Spalding. 



A few of the specimens from the last locality have a pink- 

 ish-brown line bordering the suture on the last whorl. All of 

 the specimens from both colonies are dextral. It is widely 

 separated from all other known colonies of sowerbyana. 



Section ACHATINELLASTRUM Pfeiffer. 



Achatinellastrum PFR., Malakozoologische Blatter i, 1854, 

 p. 133. PEASE, P. Z. S. 1869, p. 646 (restricted to "species 

 allied to A. productum Reeve"). SYKES, Fauna Hawaiiensis, 

 p. 320, 1900. 



The shell is imperforate, ovate-conic or oblong-conic, 



