106 PUPOIDOPSIS. 



Pupa anodon Desh. (see Vol. XXV, p. 218) is another 

 edentulous species of uncertain affinities. 



PUPA PALANGULA Boissy, Mem. Soc. Geol. France (2), iii, 

 1848, p. 276 ; Deshayes, An. s. Vert. Bassin Paris, ii, 1864, p. 

 849, pi. 55, f. 25-27, from the lower lacustrine bed, Rilly, has 

 also somewhat the aspect of Negulus. 



Subfamily PUPILLIN^:. 



This group is characterized by the possession of inferior 

 tentacles. Prior to the adult stage the shell has no apertural 

 armature. Adults have to 5 teeth in the typical positions ; 

 angular lamella when present is tuberculiform (not entering 

 and lamelliform, as in Gastrocoptinae), and remote from the 

 parietal lamella. Basal lamella is wanting. The peristome is 

 usually reflected or expanded. The size of the shell is usually 

 greater than in Vertigininae, and the small teeth, when pres- 

 ent, obstruct the aperture very little. 



Distribution continental, with the exception of Pupoidopsis 

 from Oahu, the relationships of which are uncertain. 



Genus PUPOIDOPSIS Pilsbry & Cooke, n. gen. 



The shell is umbilicate and openly rimate, conic-turrited, 

 thin, of few (4 to 4yo) very convex whorls. Aperture ob- 

 lique, ovate, toothless; peristome slightly expanded and a 

 little thickened within, the columellar margin dilated; mar- 

 gins converging, joined by a short parietal callus. Internal 

 axis rather large. 



Type : P. haivaiensis. Distribution : Lower zone of the 

 Hawaiian Islands, in Post-Pliocene deposits. 



These shells remind one forcibly of the continental genus 

 Pupoides; but they differ by the decidedly larger internal 

 axis (compare pi. 17, fig. 1, Pupoides, and fig. 2, Pupoidopsis), 

 the distinct umbilicus, the less developed peristome and the 

 absence of any trace of an angular lamella or tubercle. The 

 genus is probably not directly related to Pupoides; we doubt 

 whether it belongs to the Pupillinaa. Yet we are unable to 

 suggest any more likely place, and the general appearance 



