306 AMASTRA, MAUI. 



whorl white and the rest of salmon, within pure white. 

 Length 11, diam. 5% twentieths of an inch [14x6.5 mm.] 

 (Newc.). 



W. Maui (New<comb) ; Wailuku and Lahaina (Gulick). 



Achatinella assimilis NEWC., P. Z. S., 1853, p. 148, pi. 23, 

 f. 53 (1854). Amastra assimilis Newc., SYKES, Fauna Ha- 

 waiiensis, p. 334. Achatinella deshaysii MORELET, Bulletin 

 de la Societe d'Histoire naturelle du Departement de la 

 Moselle, viii, 1857, p. 27. 



This shell has much in common with A. affinis and pupoidea 

 of East Maui in texture, color and apical sulpture. The 

 original enlarged figure of Newcomb 's type is copied on pi. 

 27, fig. 17. 



A. assimilis is frequently larger and usually more robust 

 in figure than A. affinis; yet when all is said, the specific dis- 

 tinction is chiefly geographic ; this is West Mauian, the other 

 East Mauian. Each specific name denotes in the conventional 

 mode, a series of more or less divergent races, sometimes very 

 variable and possibly composite or hybrid. 



lao valley above Wailuku is (or in the time of Newcomb 

 and Gulick was) a locality for shells agreeing with the typi- 

 cal form of assimilis. On the western side of the summit of 

 West Maui, in Lahaina opposite the head of lao valley, the 

 shells are larger and more obese, and have often been referred 

 to A. mastersi certainly an error. 



PL 46, figs. 9, 10, 11, 13 represent Wailuku specimens. 

 The ground-color is whitish throughout, whitish with ruddy 

 spire, or coffee-tinted above, white below the periphery. Over 

 this there is a much abraded, dark cuticle, forming zigzag 

 lines or angular spots, or sometimes an olive and brown 

 cuticle is streaked and mottled with whitish (figs. 9, 10). 

 The surface is subplicate below the suture, elsewhere more or 

 less distinctly, rather coarsely striate. Embryo costate and 

 carinate (the carina sometimes almost concealed). Colu- 

 mellar fold small and median. Specimens measure : 



Length 13, diam. 7.2, aperture 6 mm. ; whorls 5%. 



Length 15.5, diam. 8.3, aperture 7 mm. ; whorls 6. 



Another shell from Wailuku is figured, pi. 41, fig. 8. The 



