TORN ATELL ARIA. 259 



ture, as there is a slight angle at the periphery. In adult 

 specimens this angle entirely disappears. 



There are about 14 spiral striae on the embryonic whorls 

 of this species. The parietal lamella is 0.1-0.2 mm. in height 

 and is very minutely serrate along its margin. The umbili- 

 cus is from one-eighth to one-tenth of the diameter of the 

 shell. In immature specimens the upper columellar fold is 

 usually slightly stronger than the lower. 



PL 54, figs. 9, 10 represent a specimen from the Waianae 

 Mts. above Waialua compared with the type in the British 

 Museum. A series of specimens from Kauai and different 

 parts of Oahu were compared with the type and this specimen 

 was nearly identical. It is fully adult, has 7% whorls and 

 measures length 4.2, diam. 2.3, axis of apert. 1.5 mm. The 

 Waianae mountains above Waialua may be considered the 

 type locality, as it is known that Newcomb collected in this 

 region. 



Another specimen, from Kaipapau, Oahu, with 8 whorls 

 is shorter, it measures length 3.9, diam. 2.4, axis of apert. 

 1.5 mm. The specimens from Kauai are identical with those 

 from Oahu. 



A shell (no. 10026 A. N. S. P.) from Dr. Newcomb, prob- 

 ably a topotype, though no locality is given, measures 4.2 mm. 

 long, 2.3 wide, with 7 whorls. 



5. T. STOKESI P. & C., n. sp. PL 54, fig. 8. 



The shell is perforate, ovate-conic, cinnamon-colored, glossy, 

 with faint, irregular striation. Outlines of spire barely con- 

 vex, nearly straight. Whorls 6^2? slightly convex, the last 

 rotund. Parietal lamella broad, a little more than a half 

 whorl long, entire and tapering in front. Columellar la- 

 mellae emerging to the edge, the upper one a little more 

 oblique and less prominent than the lower. Length 3.1, diam. 

 2, length aperture 1.2 mm. ; height of parietal lamella 0.25 mm. 



Oahu: Glen Ada, Nuuanu (Pilsbry). Type no. 112747 

 A. N. S. P. 



Shorter and more obese than T. newcombi, but like that in 

 having a minute umbilicus. In other Oahuan species the 



