214 TORNATELLIDES OF HAWAIIAN ISLANDS. 



upper being always obsolete. In an immature specimen with 

 5 whorls, the parietal lamella is 0.16, the columellar fold 0.07 

 mm. in height. There are no spiral striae on the embryonic 

 whorls (fig. 10). 



19. T. ONCOSPIRA C. & P., n. sp. PL 46, fig. 8. 



Shell perforate, ovate, dark-corneous, glossy, minutely 

 striate with lines of growth, somewhat thin and slightly trans- 

 parent. Spire ovate, with convex outlines; apex obtuse, 

 rounded. Suture simple, impressed. Whorls 5y 2 , convex, 

 the last rotund, sub-saccate below. Aperture small, obli- 

 quely truncate-ovate. Parietal lamella well developed, ob- 

 lique. Columella triangular, slightly concave below, fur- 

 nished with a deeply-seated lower fold. Peristome thin, 

 erect, outer margin convex. Umbilicus rather small, circular. 

 Length 3.0, diam. 1.6, axis of apert. 1.2, par. lam. 0.22, umb. 

 0.27 mm. 



Hawaii: Kaiwiki (Thaanum). Type no. 14170 Bishop Mu- 

 seum, cotypes in Thaanum coll. 



A very rare species of which only four specimens have been 

 taken. Unfortunately no immature specimens have been seen. 

 A second specimen in the Bishop Museum has barely over 5 

 whorls. The parietal lamella is 0.18 mm. in height. The 

 single basal columellar fold is slightly stronger than that of 

 the type. The very convex outlines of the spire and the blunt 

 apex easily separate this species from the others of the genus. 



20. T. INORNATUS P. & C., 11. sp. PL 46, fig. 13. 



The shell is ovate-pyramidal, umbilicate, the axial perfora- 

 tion very small, but enlarged at the opening by the consid- 

 erable deviation of the last whorl. Cinnamon, with some 

 whitish lines and spots due to erosion. Glossy. Outlines of 

 the spire straight, the apex obtuse. Whorls 6, not very con- 

 vex, the last rounded basally. The aperture is irregularly 

 ovate. Parietal lamella well developed, about one-third of a 

 whorl long. Columellar margin broadly dilated, the colu- 

 mella vertical, unarmed. 



Length 3.4, diam. 1.8, aperture 1.3 mm. 



