PARTULA, SOCIETY IS. 259 



apex; spire conic, the apex obtuse, roseate. Whorls 

 little convex, the last slightly more than half the total length ; 

 suture white-margined. Aperture subvertical, ovate, the 

 throat whitish; peristome thin, narrowly expanded, pale 

 Hesh colored, the columellar margin dilated, overhanging. 

 Length 19, dram. 10, aperture 10x8 mm. (Morelet). 



Tahiti (Morelet). 



Partula simplaria MOREL., Journ. de Conchy!. 1853, p. 370, 

 pi. 11, f. 13, 14. PFR., Monogr. iv, 512. 



This Partula is distinguished from P. varia by its swollen 

 shape, obtuse summit, wider, less oblique and more rounded 

 aperture, and finally the less thickened, less dilated peris- 

 tome (Morelet). 



This form has not been rediscovered, and its locality is 

 uncertain. It stands near P. assimilis', and by some authors 

 has been considered a form of P. rosea or P. varia. 



50. P. DIMINUTA C. B. Adams. 



"Shell rather thick, ovate-conic; translucent, horn-colored, 

 sometimes reddish, with a thin shining brownish horn-'colored 

 epidermis, which is much interrupted by transverse stripes; 

 with the tip white, with unequal, irregular, rather coarse 

 transverse striae, and numerous excessively minute impressed 

 spiral lines; apex subacute; spire rather short, with the out- 

 lines slightly curvilinear; whorls five, a little convex, with a 

 moderately impressed suture ; last whorl moderately oblique : 

 aperture rather small, subovate, with a tubercle on the middle 

 of the intruding part of the last whorl : lip much thickened, 

 but narrow, with a regularly rounded surface : umbilicus 

 small." (Ad.). 



Length .63, greatest breadth .36, length aperture .23 inch, 

 mean divergence 58. 



Length .525, greatest breadth .28, length of aperture .21 

 inch, mean divergence 60. 



Habitat unknown (Mus. Amherst College). 



Partula diminuta C. B. ADAMS, Annals of the Lyceum of 

 Natural History of N. Y., v, p. 41 (1851) ; Contrib. to Conch. 

 no. 8, p. 125. 



