AMASTRA, MOLOKAI. 271 



Mr. Sykes' figure is copied (fig. 15), and two other speci- 

 mens from the Cooke collection are figured. Fig. 11 repre- 

 sents a roseate shell with dark summit and very small re- 

 mains of a brown cuticle on the last whorl. Fig. 12 is a lilac- 

 gray shell with yellow upper whorls, and also mere traces of 

 cuticle. 



75b. A. m. citrea Sykes. PI. 28, figs. 16, 7 to 10. 



" Shell dextral, imperf orate, ovate-fusiform, rather solid, 

 a little glossy, yellow; somewhat obliquely, strongly striate, 

 Apex resinous, rather acute. Whorls 6, plano-convex, the 

 first moderately plicate, the last two-thirds the length of the 

 shell, slightly covered with a black-brown cuticle ; suture im- 

 pressed. Aperture ovate-lunate; columella twisted, with a 

 strong white lamina; peristome simple, the right margin un- 

 expanded, acute. Length 15, diam. 8 mm " (Sykes). 



Molokai (Hutchison, Baldwin) ; Moakea, at the eastern end 

 of the island (Borcherding). 



Amastra citrea SYKES, Pro'C. Malac. Soc., Lond., ii, Oct., 

 1896, p. 129 ; Fauna Hawaiiensis, p. 335, pi. 11, f. 5. BOR- 

 CHERDING, Zoologica, xix, p. 114, pi. 10, f. 20. 



This form is usually smaller and a little more widely conic 

 than A. simularis, but it is chiefly distinguished by the pale 

 yellow ground-color. The shapes intergrade; and there are 

 specimens intermediate in color between citrea and roseotincta. 

 Typically, only traces of the outer cuticle remain (as in fig. 

 16, 'copied from Sykes, and fig. 10, Cooke coll.), the apex 

 being whitish at the tip in some, dark brown in other indi- 

 viduals ; or there may be a brown cuticle in oblique, angular 

 lines, becoming nearly uniform behind the lip, as in the typi- 

 cal form of simularis (pi. 28, figs. 7, 8, 9). The size varies in 

 specimens apparently adult. 



Fig. 7. Length 16.2, diam. 8.4, aperture 8 mm. ; 6% whorls. 



Fig. 8. Length 13.5, diam. 7, aperture 6.2 mm. ; 6% whorls. 



Fig. 9. Length 11.6, diam. 6 mm. ; 5% whorls. 



Fig. 10. Length 13, diam. 7.8 mm. ; 6 whorls. 



