TORNATELLARIA. 257 



The ovate aperture is deeply excised by the penult whorl, 

 and has a low but long parietal lamella. Columellar lamellae 

 two, emerging, the upper one larger. Length 4.2, diam. 

 2.3, aperture 1.4 mm. ; width of umbilicus 0.4 mm. Whorls 8. 



Oahu: Mt. Tantalus, on the Castle Trail, Panoa slope. 

 Cooke & Pilsbry, 1913. Type no. 112744 A. N. S. P., cotype 

 in coll. Bishop Mus. Also Glen Ada, Nuuanu (Pilsbry). 



By its ample umbilicus this species is related to T. lila, from 

 which it differs by the less obese shape and the rounded, 

 narrower, last whorl. In T. occidentalis only the upper 

 columellar lamella emerges, and the umbilicus is quite notice- 

 ably smaller. 



In both of the localities mentioned, a w r ider form occurs: 

 length 4, diam. 2.45, width of umbilicus 0.5 mm., whorls 

 nearly 8 (pi. 54, fig. 7). This may perhaps prove racially 

 distinct, but from the material examined we do not think so. 



3. T. OCCIDENTALIS P. & C., ii. sp. PI. 54, figs. 5, 6. 



The shell is narrowly mnbilicate (greatest width of umbili- 

 cus contained 6% times in the diameter of the base), pyra- 

 midal, pale brown ; very finely but sharply striate. Spire 

 having almost straight lateral outlines, the individual whorls 

 being very slightly convex ; apex rounded, obtuse. Last 

 whorl convex, not angular, the base strongly convex around 

 the umbilicus, less so toward the periphery. The irregularly 

 ovate aperture has a rather strong parietal lamella. Colu- 

 mella reflexed, the upper lamella emerging nearly to the 

 lip-edge (or sometimes only enough to become visible in a 

 front view) ; lower lamella immersed, not visible in adult 

 shells. Length 3.9, diam. 2.2 mm., width of umbilicus about 

 0.34 mm. ; 7y 2 whorls. 



Oahu: western ridge of Popouwela, Waianae Mountains, 

 Spalding, Cooke & Pilsbry. Type and paratypes no. 108892 

 A. N. S. P., cotype in Bishop Museum. 



This species differs from T. newconibi in the following 

 details : It is smaller and darker colored ; the base is more 

 shortened ; umbilicus larger ; only the upper columellar lamella 

 is visible in the adult stage. In T. adelincc the umbilicus is 

 wider and both columellar lamellae emerge. 



