L'l'- TOKXATKLL1DKS OK HAWAIIAN ISLANDS. 



inrlla is 0.27 mm. in height. The lower eolumellar lamella is 

 0.2, the upper 0.14 mm. in height. Throughout the ueanic 

 stage the lower eolumellar lamella is much larger than the 

 upper (fig. 5). 



28. T. OAHUENSIS C. & P., n. sp. PL 48, figs. 8, 9. 



Shell perforate, subeonie, dark-corneous, somewhat glossy, 

 under a strong lens minutely striate with lines of growth, 

 somewhat solid, not diaphanous. Spire subeonie, with nar- 

 rowly ovate outlines; apex somewhat obtuse. Suture simple, 

 slightly impressed. Whorls 6, slightly convex, the last ovate, 

 slightly attenuate at the base. Aperture obliquely truncate- 

 ovate. Parietal lamella small, slightly oblique. Columella 

 narrowly triangular, unarmed. Peristome simple, erect, outer 

 margin slightly arcuate. Umbilicus small, circular. Length 

 2.9, diain. 1.5, axis of apert. 1.0, par. lam. 0.08, umb. 0.28 

 mm. 



Oa.hu: Kahuku, at a low elevation, on shrubs (Heushaw). 

 Type no. 14133 Bishop Museum, cotypes no. 111836 P. A. 

 N. S. 



Unfortunately all of the material had been preserved in 

 I'nnnalin and is somewhat bleached. This species is cer- 

 tainly closely related to T. cyphostyla Anc. The outlines of 

 the spire are slightly more convex and the parietal lamella is 

 much lower. 



In an immature shell with 5i/.> whorls the periphery is 

 slightly angled, but there is no sign of eolumellar folds. A 

 slightly smaller specimen with 5 whorls has rather weak eolu- 

 mellar folds. The lower is 0.11 and the upper 0.04 mm. in 

 height. The parietal lamella is remarkably low for such a 

 young specimen of this group, being only 0.11 mm. in height. 

 In another immature specimen with 4 whorls the embryonic 

 whorls are faintly and closely spirally striate (fig. 9). 



29. T. MOOMOMIENSIS P. & C., n. sp. PL 48, figs. 14, 15. 



The shell is pyramidal, openly umbilicate, very lightly stri- 

 ate. Spire with straight outlines, the apex subacute. Whorls 

 7. the first convex, the rest nearly flat. Last whorl tapering a 



