AURICULELLA, OAHU. 91 



near the outer margin of the eolumella extending to the inner 

 margin of the lip, at the base of the eolumella. Lip rather 

 thin, expanded, the outer margin curved, the columellar mar- 

 gin reflexed over the umbilicus, the margins united by a thin, 

 transparent callus. Umbilicus minute, subcircular. Length 

 4.5, diam. 3.0 mm. 



Immature specimens have a rather prominent transverse 

 columellar fold, and the perpendicular fold 011 the face of the 

 eolumella is absent. 



Oahu: Nuuanu (Cooke) ; Kuliouou (Thaanum). 



This species is closely related to A. perpusilla Sm. It has a 

 slightly larger shell, with the last whorl more tumid. The 

 shell is slightly thicker. The columellar fold is slightly more 

 distinct and with the presence of the additional perpendicular 

 fold easily separate the two species. This outer fold is rather 

 hard to make out as it is very minute. A. perversa differs 

 from A. minuta by the sinistral coil and the vertical fold men- 

 tioned. It is also usually wider. 



The specimens from Kuliouou are a shade darker and 

 slightly smaller, 4.4 mm. long. 



12. A. PERPUSILLA Smith. PL 25, figs. 1, 2. 



"Shell minute, sinistral, shortly ovate-conic, perforate, 

 fragile, corneous. Whorls 5, somewhat convex ; suture simple ; 

 aperture subcircular; parietal lamina thin; lip thin, very 

 slightly dilated ; eolumella scarcely plicate, somewhat reflexed. 

 Length nearly 4, diam. 2.66 mm." (Smith). 



Oahu: Kahalu (Gulick) ; Kahana (Lyman, Kuhns) ; Kali- 

 uwaa (Judd) ; Kaaawa (Spalding, Kuhns). 



Auriculella perpusilla SMITH, P. Z. S., Lond., 1873, p. 87, 

 pi. 10, fig. 26. PFEIFFER, Mon. Hel. Viv., viii, p. 213. AN- 

 CEY, Bull. Soc. Malac. France, vi, 1889, p. 220. 



The single specimen collected by Mr. Gulick and described 

 by Mr. Smith, is unfortunately broken. There is enough re- 

 maining to make out the characters of the last whorl and aper- 

 ture. The shells from Kahana collected by Mr. Lyman agree 

 very closely with the type. They are multicolored, as fol- 

 lows : corneous ; dark chestnut ; corneous with a dark band at 



