AURICULELLA, MOLOKAI. 103 



21. A. FLAVIDA Cooke, n. sp. PL 26, figs. 8, 9. 



The shell is minutely perforate, dextral or sinistral, ovately 

 conic, naphthalene yellow, very thin, slightly diaphanous, 

 glossy, under a lens minutely striate with lines of growth and 

 with extremely fine revolving striae. Spire conic, apex obtuse. 

 Suture hardly impressed, simple. Whorls 6^2, slightly con- 

 vex, the embryonic rather large, rounded, the last rotund, sac- 

 cate but slightly tapering below. Aperture broadly oval, 

 scarcely oblique. Parietal lamella very small, white. Colu- 

 mella nearly straight. Lip very slightly thickened, the outer 

 margin arcuate ; the columellar margin is reflexed ; parietal 

 callus thin. Umbilicus moderate, rimate. Length, 6.2, diam. 

 3.1 mm. 



In the young the shell is imperforate, the columella is sim- 

 ple, not dentate, slightly twisted. 



Molokai: Kamalo (Thaanum, Pilsbry & Cooke). 



This shell has the appearance of a small A. cerea Pfr. It 

 differs considerably from the common forms of Pfeiffer's 

 species in being much thinner and smaller, with a smaller 

 umbilicus and thin parietal callus. It is closely related to 

 A. newcombi Pfr., but differs in its less flattened base, and 

 less conic spire, and the aperture is not diagonal. 



In thirteen specimens of the original lot before me, only 

 two are sinistral. In a lot of eight from one of the colonies 

 above Kamalo amphitheatre, six are sinistral ; and in a lot of 

 seven from a neighboring colony, two are sinistral. The type 

 is a dextral individual. The color varies ordinarily from mar- 

 guerite yellow to amber yellow ; but a single specimen is a uni- 

 form light brownish-corneous; two specimens are yellowish- 

 corneous with a broad brown band just above the periphery 

 and extending on the spire. 



In a lot from above the western colony of Partulina redfieldi 

 kamaloensis, the parietal callus is thickened, as in A. cerea. 



22. A. CEREA (Pfeiffer). PI. 26, figs. 1 to 7. 



"Shell slightly perforate, dextral, elongately conic, thin, 

 finely striate, diaphanous, wax colored; spire turrited, apex 

 obtuse ; whorls 8, scarcely convex, the last whorl nearly equal 



