AMASTRA, MOLOKAI. 273 



maura (length 16.5, width 8.5, apert. 6 mm.), with 6 whorls. 

 Apex blackish, the subsequent whorls fulvous, sometimes with 

 straight, somewhat obscured, revolving lines, the lower half 

 of the last whorl yellowish flesh-colored. Columellar margin 

 bluish, with a white plait. Mouth light-colored ' ' ( Ancey) . 

 Amastra simularis var. semicarnea ANC., 1. c., pi. 13, f. 8. 



Not BORCHERDING, 1. C., p. 114, pi. 10, f. 15. 



A cotype from Ancey's collection, no. 18345, Bishop Mu- 

 seum, is figured on pi. 39. The first 1% whorls are flattened, 

 strongly costate and carinate, as in typical mucronata (simul- 

 aris) . Subsequent whorls have the color of A. mastersi; 

 and no doubt this form is what Newcomb referred to as mas- 

 tersi from Molokai in his Synopsis, p. 149, as Dr. Cooke has 

 suggested to me. It differs from the true m,astersi by the 

 less inflated shape and the very strong sculpture of the early 

 whorls. Length 16, diam. 8.8 mm. Borcherding's figures 

 represent a rather obese form of " simularis ". 



76. A. SYKESI n. sp. PI. 42, figs. 2, 3. 



The shell is subrimate, globose-conic, thin, not shining. 

 After the smooth initial half- whorl there is a flat, strongly cos- 

 tate whorl, with a carina half-concealed in the suture; the 

 next whorl is costulate only below the suture, its lower part 

 smooth. Following whorls but weakly convex, finely marked 

 with growth-wrinkles which are a. little stronger on the glo- 

 bose last whorl. The entire shell may be fleshy-ochraceous, 

 with some faint angular brown markings on the penult, 

 whorl, the last whorl without outer cuticle ; or it may be 

 very faintly yellow-tinted white, the apex brownish, last two 

 whorls partly covered with an extremely thin cuticle which 

 is marked with zigzag olive-brown streaks. Aperture pinkish 

 in the one, white in the other color-form; outer lip narrowly 

 rimmed within. Columellar lamella triangularly projecting. 



Length 11.1, diam. 7.5, aperture 6 mm. ; 51/2 whorls. 



Length 10.8, diam. 7, aperture 6 mm. ; 5y 2 whorls. 



Molokai: Halawa (D. Thaanum). Cotypes to be deposited 

 in Bishop Museum, from no. 5316, Thaanum coll. 



Very much more inflated than any other zigzag-striped 



