TORN ATELL ARIA. 251 



length 2.9, diam. 1.3, axis of aperture 1.1 mm. The parii-tiil 

 lamella is 0.13 mm. in height. There are 26 costee on the last 

 whorl. This specimen was collected by Heushaw and is from 

 the original lot of dirt from which Ancey's type was selected. 



This and T. waianaensis are the only Hawaiian perforate 

 species having an entering or spiral palatal plica. This char- 

 acter is found in some of the Hawaiian species of Elasmias 

 and Auriculella. In all it occurs in the neauic stage, disap- 

 pearing in maturity. 



In very young specimens the two columellar folds are rather 

 strong, slightly oblique and of about an equal size. In slightly 

 older specimens the upper columellar fold is a little stronger 

 than the lower (fig. 11). 



Mr. Thaanum has searched the region from which the fossil 

 material came, but was unable to find living examples of this 

 species. 



Genus TORN ATELL ARIA Pilsbry. 



Tornatellaria PILS., Nautilus xxiii, March, 1910, p. 123, type 

 T. newcombi. 



Tornatcllinidce with the shell perforate or umbilicate, thin, 

 dextral ; shape from ovate to pyramidal-conic, the outlines of 

 the spire nearly straight; whorls G 1 /^ to 9%, flattened or not 

 very convex; apex minutely striate spirally, surface smooth- 

 ish. Parietal lamella from two-thirds to an entire whorl long. 

 Two columellar lamella? in the young stages, one or both 

 emerging in the adult. Peristome thin, unexpanded and 

 acute. Mantle marked with narrow black blotches and lines 

 transverse to the whorls. Oviparous. 



Type : T. newcombii Pfr. Distribution : Hawaiian Islands, 

 i-xcept Niihau and Kahoolawe. 



These small forest snails are like Tornateltides in being thin, 

 self-colored or nearly so, and umbilicate. They are separated 

 from Tornatellides chiefly by reason of their oviparous repro- 

 duction (the other genus being viviparous), and also by the 

 more deeply entering parietal lamella. Usually, too, the shape 

 is more strictly conic or pyramidal, and the whorls are flat- 

 tened. The genus is neither so generally distributed nor so 



