Original Descriptions of Achatiyielta. 75 



Many of the shells of this group are closely related to some of 

 the shells of the livida or curta group. They are all found farther 

 west, and as a rule are more slender in shape. 



107. Achatinella sonata Gulick. 



A. zonata Gk. Ann. Lye. New York, vol. vi, 1858, p. 237, pi. viii, fig. 58. 



Shell sinistral, sometimes dextral, imperforate, ovate-conic, 

 solid, shining, striated, white or yellowish, with a brown sutural 

 band, and two black bands, one entering the aperture ; apex some- 

 what acute; spire conical, with outlines slightly convex; suture mar- 

 ginate, moderately impressed ; whorls 6, convex ; the last regularly 

 rounded ; columellar fold central, rose or white, moderately de- 

 veloped ; aperture semiorbicular, white within ; peristome slightly 

 thickened within ; with external margin unrefledled, arcuate, 

 acute ; columellar margin dilated, adnate ; parietal margin wanting. 



Length 0.65 in. (16 1-2 mill.), breadth 0.40 in. (10 mill.). 



Length of body whorl 0.49 in. (12 2-5 mill.). 



Average weight 4.60 grains. 



Remarks. The dextral specimens are for the most part found 

 in Waimea and Pupukea. — Gk. 



Hab. Waimea, Pupukea, Waialee, Kahuku, and Hauula. 

 — Gk. Kaaawa. — J. S. Emerson. 



108. Achatinella dimorpha Gulick. 



A. dimorpha Gk. Ann. Lye. New York, vol. vi, 1S5S, p. 236, pi. viii, fig. 56. 



Shell sinistral, sometimes dextral, imperforate, turreted, solid, 

 shining, striated, white or yellow, with a brown sutural band ; 

 apex rather obtuse ; spire turreted ; suture marginate, moderately 

 impressed ; dark brown ; whorls 6, convex ; columellar fold cen- 

 tral, white or rose, moderately developed ; aperture truncately 

 ellipsoidal, white within ; peristome slightly thickened within ; 

 with external margin unrefledted, arcuate, acute ; columellar mar- 

 gin dilated, adnate ; parietal margin wanting. 



Length 0.70 in. (18 mill.), breadth 0.37 in. (9 2-5 mill.). 



Length of body whorl 0.45 in. (11 2-5 mill.). 



Average weight 4.00 grains. 



Station. On the leaves of the Pua, Ahakea, and other trees. 



Remarks. This and A. zonata Nob., which inhabit the same 

 valleys, correspond to A. curta and A. recta Newc, which are 

 similarly associated in the valleys of Waialua, an adjoining dis- 

 trict of the same i.sland. — Gk. 



Hab. Waimea, Pupukea, Waialee, and Kahuku. — Gk. 



