TOBNATELLIDES OF HAWAIIAN ISLANDS. 235 



larly crenulate. Whorls 7, the embryonic increasing rapidly, 

 the rest convex, increasing slowly, the last elongate, tapering 

 towards the base, slightly flattened about the umbilicus. 

 Aperture rather large, obliquely truncate-oval. Parietal la- 

 mella moderate. Columella narrowly triangular, furnished 

 with two minute parallel folds, which extend to the margin. 

 Peristome thin, erect, with the outer margin slightly flattened. 

 Length 3.8, diam. 1.65, axis of apert. 1.2, par. lam. 0.14, umb. 

 0.38 mm. 



Oahu: Palehua in the Waianae Mts. (type loc.) and along 

 the range as far as Popowela. Type no. 36267 Bishop Mu- 

 seum, cotypes no. 111844 P. A. N. S. 



Named for Ronald von Holt, who collected a part of the 

 original series. This species is found on the leaves and twigs 

 of shrubs and on the ieie. T. ronaldi is separated from the 

 other species of this group by its size, long attenuate spire 

 and convex whorls. Its distinctly irregularly striated sur- 

 face also serves to differentiate it. 



In an immature specimen with 5 whorls the embryonic 

 whorls are smooth, without an indication of spiral stride. The 

 parietal lamella is strong, oblique and 0.21 mm. in height. 

 The lower columellar fold is strong, but not as strong pro- 

 portionately as in most of the other species of this group. The 

 upper columellar fold is 0.11, the lower 0.18 mm. in height 

 (fig. 7). 



40. T. POPOUELENSIS P. & C., n. sp. PI. 50, figs. 9, 10. 11, 12. 



The shell is pyramidal, urnbilicate (the umbilicus moder- 

 ately wide in the last whorl, but above it the axial perforation 

 is very small), cinnamon-brown, somewhat glossy, finely, un- 

 evenly striatulate. The outline of the spire is straight, the 

 apex rather obtuse. Whorls 5i/ 2 , moderately convex, the last 

 narrowly rounded at the base, and somewhat excavated be- 

 hind the broad wall of the columellar lip. Aperture truncate- 

 ovate. Parietal lamella moderate, nearly a half-whorl long. 

 Columellar margin slightly sinuous, dilated. Columella hav- 

 ing a quite small, deep-seated, oblique lamella close to its in- 

 sertion, and the trace of another below it ; neither reaching to 



