AMASTRA, OAHU. 197 



ably darker aperture. The growth-wrinkles are more pro- 

 nounced through the wearing-off of the more friable perios- 

 tracum in this species and the contrast of the brown remnants 

 with the more opaque white of the middle layer. Gulick's 

 type figure is copied in fig. 19 of plate 31. 



The shells in the Cooke collection and U. S. Nat, Mus. (no. 

 4T22&) differ from rubicunda chiefly in the colder color- tones, 

 the aperture being whitish rather than pink, and the summit 

 white, or in one specimen, purple. The spire is not so high 

 as in typical rubicunda. Such differences as there are seem 

 insufficient for specific distinction. Pauoa is a small valley 

 immediately east of Nuuanu, and which divides the lower 

 part of a ridge leading up to Konahuanui, the locality of A. 

 rubicunda. 



37. A. tenuilabris rubicunda Baldwin. PL 32, figs. 12, 14, 15. 



''Shell dextral, imperf orate, rather solid, elongately ovate- 

 conic ; surface lusterless, striated with irregular growth striae ; 

 embryonic whorls smooth. Color reddish, with traces of a de- 

 ciduous, thin, brown epidermis. Whorls 7, slightly convex; 

 suture well impressed. Aperture elongately oval, a trifle ob- 

 lique, rather small, purplish-red within; peristome simple, 

 thin, margined with dark purple; columella white with a 

 purple tinge, flexuous, abruptly terminating in a thin, slightly 

 curved lamellar plait. Length 19, diam. 9 mm. 



''Animal, mantle brown, margin of a deeper shade. Foot 

 brown, the superior portion almost black. The formula of the 

 dentition is 18.10.1.10.18, according to H. Suter" (Baldw.). 



Oahu: Konahuanui Mt. (Baldwin, type loc.) ; Nuuanu, 

 Kalihi and Moanalua (C. M. Cooke). 



Amastra rubicunda BALDW., Proc. A. N. S. Phila., 1895, p. 

 229, pi. 11, f. 38. Helicter (Amastra} rubicunda Baldwin, 

 SUTER, Proc. A. N. S. Phila.. 1895, p. 240, pi. 11, f. 54,56 (jaw 

 and teeth). 



The embryonic whorls are somewhat worn in the type lot of 

 four specimens, no. 65719 A. N. S. P., but a few fine striae are 

 visible on the second and third whorls. The ground-color is 

 light red, sometimes becoming fleshy-yellowish on the last 



