PUPA. 



211 



Lingual membrane with 25 teeth (12 1 12) in each row. Central teeth very 

 small, tricuspid ; laterals bicuspid, modified into serrated marginals. (Fig. 14.) 



Genitalia unobserved. 



Fig. 114. 



Fig. 115. 



Pupa pellucida. 



Lingual dentition of Pupa corticaria. 



Pupa pellucida, PFR. 



Shell subperforate, cylindrical, thin, pellucid, shining, pale yellow, spire 

 somewhat attenuated, apex obtuse ; whorls 5, convex, the last flatter than the 

 penultimate ; aperture semi-oval, with 5 teeth ; single strong 

 teeth on columella and parietal wall of aperture, two moderate 

 ones on right side, a fifth small basal one within the aper- 

 ture ; peristome simple, its right end expanded, its columellar 

 end reflected. Length, 2 mill. ; diameter, scarcely 1 mill. ; 

 aperture, scarcely f mill. long. 



Pupa pellucida, PFEIFFER, Symbols, I. 46 ; Mon. Hel. Viv., II, 

 360; in R"MER'S Texas, 456. KUSTER, in CHEMNITZ, ed. 2. 

 89, PI. XII. Figs. 24, 25. W. G. BINXEY, Terr. Moll., IV. 147; L. & 

 Fr.-W. Sh., I. 246 (1869). 



Pupa srrrilis, GOULD, Bost. Journ. Nat. Hist., IV. 356, PI. XVI. Fig. 14. - 

 PFEIFFER, Mon. Hel. Viv., II. 360. 



Pupa Rusei, PFEIFFER, olirn, Mon. Hel. Viv., III. 532. KUSTER, in CHEM- 

 NITZ, ed. 2, 176, PI. XXI. Figs. 13, 14. 



Leucochila pellucida, TRYON, Aiuer. Journ. Conch., IV. (1868). 



A West Indian species quoted by Pfeiffer from Texas, but not elsewhere 

 noticed ; it is probably confined to the Texan Subregion. I have seen no 

 specimens of it. Fig. 115 is a fac-simile of that of P. servilis. 



Animal unobserved. 



Pupa borealis, MORKLKT. 



Shell rimate, ovate-oblong, shining, diaphanous, reddish horn-color, with 

 miscroscopic revolving striae ; whorls 6, rather convex, the last compressed be- 

 low, forming a medium-sized excavation ; aperture somewhat rounded-oval, 

 moderate, four-toothed, one deep, foldlike, on the parietal wall, one columellar, 

 the rest smaller, palatal ; peristome simple, straight, its columellar extremity 

 slightly dilated above. Length, 3 mill.; width, 1^ mill. (Morelet.) 



Pupa borealis, MOKELET, Journ. de Conch., VII. 9 (1858). 



An Asiatic species, said also to be found in Alaska. 

 Animal unknown. 



