AMASTRA, MAUI. 307 



white ground is nearly covered with a whitish cuticle densely 

 marked with zigzag stripes. The last whorl is carinate in 

 front, and somewhat malleated below the carina. On the 

 last third of the last whorl the cuticle becomes nearly uni- 

 form and blackish. Length 14, diam. 8.2 mm. 



There are also some stouter shells in this lot, resembling 

 those from Lahaina. 



In the Boston Society collection (part of no. 1519) there 

 is a small form with the ordinary Waialua shape, which was 

 segregated by Hyatt as siibassimilis (pi. 46, figs. 7, 8). It 

 has a ground-color of pale fleshy-brown above the periphery, 

 the embryonic whorls dark brown, and the base brown-tinted 

 whitish. Cuticle remains in angular blackish figures on a 

 pale ground on the last part of the penult, whorl, becoming 

 dense, black and continuous on the latter half of the last 

 whorl. The carina of the neanic stage is visible above the 

 suture on the penult, whorl, and continued as an impressed 

 line on the first half of the last whorl. Aperture as in as- 

 similis. Length 12.7, diam. 7.1, aperture 6 mm. ; 6 whorls. 

 "Waialua, Gulick coll. Probably a local race. 



In Lahaina (pi. 46, figs. 12, 14, 15) the shells are mainly 

 larger, more obese though some also occur exactly similar to 

 those of Wailuku. The color-patterns are as described above, 

 with transitions between them, but most large shells are 

 almost wholly denuded of the outer cuticle. 



Fig. 14. Length 18, diam. 10, aperture 9 mm. ; 6 whorls. 



Fig. 15. Length 17, diam. 11, aperture 9.4 mm. ; 6 whorls. 



Fig. 12. Length 16, diam. 9 mm. 



Length 15, diam. 8 mm. 



This form resembles some of the Molokai shells identified 

 as A. mastersi by Herr Borcherding, but which are now re- 

 ferred to A. borcherdingi. 



Morelet's original series of A. deshaysii, now in the British 

 Museum, has been examined by Mr. Sykes, who states that 

 two specimens belong to A. assimilis and one to A. biplicata. 

 The diagnosis, translated below, applies to assimilis only. 



"Achatinella deshaysii. Shell slightly rimate, ovate-tur- 

 rite, longitudinally rugose, fleshy straw-colored under a deep 



