TORNATELLINA. 173 



regularly striate ; outlines of spire slightly convex ; last whorl 

 somewhat compressed laterally. Parietal lamella very broad, 

 subhorizontal, about a half-whorl long. Columella spirally 

 twisted. 



Length 3, diam. 1.2, aperture 1 mm. ; 5 whorls. 



Length 2.4, diam. 0.9, aperture 0.8 mm. ; 4% whorls. 



In the neanic stage (fig. 8, length 1.8 mm.) the parietal 

 lamella is broader but not sinuated ; the columella has a stout 

 median lamella; there are no palatal ribs or plicae. 



Oahu: southwestern rim of Tantalus bowl, outside, living 

 in lichen growing on damp tree trunks (Cooke & Pilsbry). 



With some resemblance to T. cylindrica, this species dif- 

 fers by the characters of the neanic stage and the stronger 

 striation. The systematic position of the species is uncertain, 

 as it may prove to have Lamellina characters in the ananeanic 

 stage, which is not represented in the numerous series under 

 examination. 



32. T. IMPRESSA Mousson. PI. 34, fig. 8. 



''Last whorl somewhat tapering, the side concavely im- 

 pressed in the middle. The last whorl tapers as it nears the 

 aperture, and becomes a little concave, the concavity spiral 

 in direction. At the same time it thickens a little, as may be 

 seen by the greater opacity. Between this form and the type 

 with rounded last whorl there are all possible intermediate 

 forms" (Mouss.). 



Kanathia, Fiji Is. (Dr. Graeffe). Mousson reports T. 

 conica var. impressa as occurring also in Vai-Tupu, Ellice 

 Is., and as an individual variation on other islands of the 

 group. 



Part of Garrett's specimens of T. conica from Huaheine are 

 referable to var. impressa. Pi. 34, fig. 8, represents one from 

 Huaheine measuring 3.5 mm. long, diam. 1.55, aperture 1.1 

 mm. ; nearly 6 whorls. 



T. pusilla Gld. has a similar impressed zone on the last 

 whorl, but it differs by having a more heavily calloused colu- 

 mella ; that of T. impressa is only moderately thickened above, 

 where the columellar curvature is greatest. "Var. impressa" 



