138 



ACHATINELLA BYRONII. 



Length 17.8, diam. 10.7, 'aperture 9 mm. 



Length 15.5, diam. 9.5, aperture 7.5 mm. 



Through the darkest specimens, this race seems to connect 

 with the more wrinkled small form of rugosa, no. 3. 



3. At the lower edge of the above colony, just above the 

 locality of A. cookei, there is a diminutive race similar to the 

 preceding in shape, but more strongly wrinkled, with the 

 color-patterns of subvar. capax also a few very deep chestnut 

 shells. The narrow lip is purple, and the upper whorls flesh, 

 pink. Length 17, diam. 9.8, aperture 8.3 mm., 5% whorls. 

 PI. 31, figs. 8, 8a. 



Forms 2 and 3 were collected Feb. 17, 1913, in company 

 with Messrs. Spalding and Mem-am. 



4&. A. BYRONII NIGRICANS n. subsp. PI. 31, figs. 10, 11, 12. 



The shell is sinistral, oblong-conic, rather solid. Embryonic 

 3 whorls snow-white, the next whorl brown, or brown and 

 green, with a light band, last whorl intensely 'black above, 

 but on close inspection showing very indistinctly a dusky 

 greenish-yellow band at periphery and a wider one on the 

 base. The surface of the last two whorls is rather coarsely 

 wrinkled, tand has a brilliant gloss. The aperture is very 

 oblique, ovate, white or with a faint lilac tint within; peris- 

 tome has a narrow callous rib within of a fine purple color, 

 changing to violet at the lip-edge. Columellar fold purple 

 with white tip or crest. Parietal wall deep purplish brown. 



Length 17.4, diam. 11, aperture 9 mm. ; 6% whorls. 



Length 21, 'diam. 12.3 mm. 



Waimano-Manana ridge at about 1400 ft. elevation, in a 

 very small area along the summit trail (Spalding, Merriam, 

 Pilsbry, Wilder). 



This form differs from rugosa Newc. by its capacious form, 

 coloration and sinistral coil. The last character would not 

 be of much significance were it not that the whole byronii- 

 rugosa series is dextral, in hundreds of individuals which have 

 been examined from many localities. A snow-wMte embryo 

 is also occasionally seen in rugosa. A. b. nigricans is doubt- 

 less a derivative from rugosa. 



