COCOS ISLAND NESOPUPAE. 323 



group Nesopupa at the eastern rim of the Pacific is not un- 

 precedented. 



20. NESOPUPA COCOSENSIS (Ball.). PI. 30, figs. 10, 11. 



"Shell small, reddish brown, rather pointed, with nearly 

 five rounded whorls; apex paler, polished, rather blunt; last 

 whorl much the largest ; base rounded with a well-marked 

 umbilical pit; aperture wider behind, the posterior part of 

 the outer lip and the pillar lip broadly reflected, the anterior 

 outer and basal margin narrow ; the pillar and outer lip united 

 by a thin callus ; lamella? according to Sterki's formula .ABDE, 

 comprising one columellar and two parietal folds, and, on the 

 outer wall well within the peristome, two narrow little-elevated 

 ridges, of which the anterior is shorter. Axial length of shell 

 2.2, of aperture .8, width of last whorl 1.5, of aperture .8 mm." 

 (Dall.) 



Cocos Island, on leaves (Heller and Snodgrass). 



Vertigo cocosensis DALL, Proc. Acad. Nat. Sci. Phila. 1900, 

 p. 98, pi. 8, f. 13. 



"The chief peculiarity of this species is that the surface, 

 which looks silky under an ordinary hand lens, when more 

 magnified is seen to be punctate all over, recalling V. variolosa 

 Gould, of Florida, which, however, differs in form, size and 

 dental armature" (Dall). 



By the color, sculpture and teeth this species appears most 

 nearly related to those of Polynesia, but differs by the simpler 

 columellar lamella, which does not curve dowai at its inner end. 

 It is the only member of the genus found on the American 

 side of the Pacific. 



The shell is ovate, deeply rimate, tawny, when not dulled by 

 age, with a brighter cinnamon-rufous lip ; densely and very 

 minutely pitted, and with weak striae of growth. The last 

 whorl has a slight impression over the upper palatal fold. 

 The teeth are grayish-w T hite. The angular lamella curves out- 

 ward and in old individuals joins the termination of the outer 

 lip, as in fig. 11. The high parietal lamella is somewhat 

 curved. The columellar lamella slants downward somewhat, 

 enters horizontaJlv and is not turned down at the inner end. 



