TORNATELLIDES OF HAWAIIAN ISLANDS. 237 



strong, and the columellar dilation, slightly swollen in the 

 adult, carries an indistinct fold above, tending to be obsolete. 

 In young shells, on the contrary, two strong columellar folds 

 may be observed, the lower one projecting more. The colora- 

 tion is a very light reddish-corneous" (Ancey). 



Ancey 's type-specimen is broken about the parietal wall 

 and does not show the characters of the aperture. A second 

 lot from the Ancey collection, from Hilo, has three speci- 

 mens, one of which is immature. This is undoubtedly the 

 young specimen referred to by Ancey in his note. 



Typical specimens were -collected in Olaa. In an adult 

 specimen (pi. 51, fig. 1) the columella is furnished with two 

 low, indistinct folds. This specimen measures: length 2.6, 

 diam. 1.25, axis of apert. 0.92, par. lam. 0.14, umb. 0.25 mm. 

 T. pyramidatus is very closely related to T. macroptychia of 

 East Maui. It differs mainly in its slightly more convex and 

 closely-coiled whorls, shorter last whorl and, in adult speci- 

 mens, the columellar folds are less strongly developed. 



In a young specimen with 5 whorls the lower columellar 

 fold is not as strongly developed as in the young of T. ma- 

 croptychia of about the same age. The upper fold is 0.02, the 

 lower 0.09 mm. in height. The parietal lamella is 0.22 mm. 

 in height (pi. 51, fig. 2). 



An embryonic shell from Kilauea is nearly smooth, there 

 are no indications of spiral lines, but the surface is minutely 

 transversely striate, especially near the suture. 



42. T. WAIANAENSIS P. & C., n. sp. PI. 51, figs. 3, 4. 



The shell is slender, turrited, umbilicate (the umbilicus 

 moderately large at the last whorl, but the axial perforation 

 above it very minute) ; cinnamon-brown, usually showing 

 darker and paler streaks ; somewhat shining ; distinctly striate 

 at and below the periphery. Outlines of the spire straight. 

 Whorls 61/2, convex. Parietal lamella high and at least a half- 

 whorl long. Columellar lip broadly dilated, and having the 

 very weak, inconspicuous trace of a lamella, which is subhori- 

 zontal and close to the upper insertion. Length 3.2, diam. 

 1.45. aperture 1 mm. 



