TORNATELLINA. 147 



flattened and slightly depressed around the middle ; aperture 

 small, ovate, less than one-half the length of shell; outer lip 

 simple, acute, slightly contracted at the middle; plait on 

 inner lip prominent; base of the columella slightly reflected 

 over the umbilical region and furnished with one or two 

 plaits or tooth-like projections" (Pease). 



9. T. MICANS Garrett. 



"Shell small, irnperf orate, ovate-conic, transparent, thin, 

 polished, faintly striate under the lens, pale brownish-horn 

 color; spire subacute, oblong-conic, sides planulate ; suture 

 distinctly and narrowly marginate ; whorls six, siib-planulate, 

 slowly and regularly increasing, the last rather large, not 

 descending in front; aperture oblique, ovate-lunate, more 

 than a third the length of the shell; parietal wall with a 

 prominent, strongly compressed lamina; peristome thin, sim- 

 ple, regularly curved; columella slightly twisted, depressed, 

 armed with a sub-median, nearly horizontal, acute tooth-like 

 fold ; palate with numerous irregularly disposed denticles. 



Length 21/2, major diameter iy 2 mm. 



Austral Is.: Rurutu (De Gage). 



Tornatellina micans GARRETT. Proc. A. N. S. Phila., March 

 25, 1879, p. 23. 



4 i A single example before me differs so much from any other 

 species, that, after some hesitation, I have concluded to de- 

 scribe it as new. 



"It is shaped almost precisely like affinis, but has the pala- 

 tal denticles, and acute, columellar, tooth-like plait of nitida" 

 (Garr.). 



This species will be recognized by its flattened whorls. 



10. T. SOCIETATIS n. sp. PL 36, fig. 1 ; pi. 35, figs. 8, 11. 



The shell resembles T. nitida in shape, is light brown with 

 some whitish streaks on the last whorl, marked with weak 

 growth-lines, glossy. In front view the columella is rather 

 strongly sigmoid, as in T. nitida ; but viewed obliquely in the 

 mouth there is seen to be an oblique, spirally entering colu- 

 mellar fold above, then a rather acute columellar lamella, and 





