176 TORNATELLINA. 



weakly twisted, moderately folded above, projecting forward 

 in the middle. Palatal laminae smooth, rather low, chiefly 

 placed with the first half of the last whorl. Length 3.2, diam. 

 1.7, length of aperture 1.2 mm. 



Society Is.: Huaheine (A. J. Garrett), with T. conica. 



Several examples differ from T. conica, with which they 

 were found, in having internal callous ribs at intervals, as in 

 Lamellina, but the columella is not lamellate, being merely 

 twisted, as in T. conica, at least in the mature stage, thereby 

 differing markedly from the typical Lamellinae. Further ma- 

 terial, especially young shells, are needed to determine the 

 status of this form. 



33. T. PUSILLA (Gould). PL 34, figs. 1 to 4. 



Shell small, elongate, conic, polished, whitish-corneous, per- 

 forate. Spire acute. Whorls 6, convex, tabulate above. 

 Aperture subquadrate, posteriorly furnished with a lamella 

 revolving inward. Peristome reflexed, the right margin 

 sinuous. Length three-twentieths, width three-fortieths inch. 

 [L. 3.75, diam. 1.87 mm.] (Gould.) 



Paumotu Is. : Metia (Makatea) , an island in the western end 

 of the archipelago, found under stones (Couthouy, U. S. Expl. 

 Exped.). 



Partula pusilla GOULD, Proc. Boston Soc. N. H., ii, 1847, p. 

 197 ; Expedition Shells, p. 33 ; U. S. Expl. Exped., Mollusca 

 and Shells, p. 83, pi. 7, f . 90, 90a. Cf. Ancey, Bull. Soc. Malac. 

 France, vi, 220. 



Gould's description and figure (fig. 4) are copied. 



In describing the peristome as "reflexed" he evidently re- 

 ferred to its columellar margin only. This species resembles 

 T. impressa in all but the perforation; and it may be sus- 

 pected that Gould was mistaken about this point. Unfor- 

 tunately, the type specimen is no longer to be found in the 

 National Museum. 



Shells (pi. 34, figs. 1, 2, 3) agreeing well with the figure 

 and dimensions of pusilla are before us from Rarotonga, and 

 another lot was labeled "T. nitida, Ebon Island." The shell 

 is imperforate, turrite, with slightly convex sides, compara- 



