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, Proc. Malac. Soc., Lond., ii, Oct., 

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

 CHERDING, Zoologiea, 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. 



