TORNATELLINA. 149 



In general form this species resembles T. conica, with which 

 the major part of the description also agrees. In the three 

 examples observed, the spire is a little less elevated, and the 

 last whorl is relatively larger. The chief difference between 

 the species is in the columella, which in conica forms a weak 

 subvertical cord, but in columellaris an acute lamella revolves 

 about the columellar column, without reaching the edge. In 

 one of the specimens there is a vertical series of three little 

 dentiform granules some distance within the aperture. 



The above description and observations, somewhat abbre- 

 viated from Mousson, show that T. columellaris is a form 

 closely related to T. nitida, from which it differs by its shorter, 

 broader shape. The internal teeth, which Mousson thought 

 were probably pathologic, are apparently vestigeal structures 

 in both of these species, being present only in certain indi- 

 viduals, or at certain stages of growth. 



12. T. KERMADECENSIS P. & C., n. sp. PL 39, figs. 1 to 5. 



The shell is imperforate, oblong-conic, yellowish-corneous, 

 glossy, composed of 5^ rather strongly convex whorls, the 

 last not compressed peripherally. Aperture irregularly 

 ovate; parietal lamella strongly developed, at least a half- 

 whorl long, straight in section. Columellar lamella median, 

 very strong, deeply entering ; a small, obtuse fold visible above 

 it in oblique view. Palatal wall bearing several pairs of 

 teeth, which are slightly lengthened in a spiral direction, and 

 are visible through the shell. Length 3.3, diam. 1.6, aperture 

 1.2 mm. 



In the paraneanic stage (figs. 4, 5) the parietal lamella has 

 an outward-flaring median lobe, and there are distinct, blunt, 

 teeth above and below the median columellar lamella. 



Kermadec Is.: Sunday Island (Tom Iredale). Type to be 

 deposited in the Canterbury Museum, Christchurch, N. Z. ; 

 paratype in coll. A. N. S. P. 



While very closely related to T. perplexa, this species is 

 noticeably stouter in figure from the apex on ; yet possibly it 

 should be ranked as a subspecies of that Polynesian shell. 



