PUPA. 197 



formation about the other species I am indebted to Mr. Morse, whose figures 

 are copied below. 



The jaw is low, wide, arcuate (in P. rupicola, . 



strongly arched) ; ends but little attenuated in mus- 

 corum, penlodon, fallax, rupicola, acutely pointed 

 in corticaria ; a more or less developed, broad, 



Jaw of Pupa badia (Morse). 



blunt median projection to the cutting edge; an- 

 terior surface without ribs, but generally with vertical stria;. 



PI. IV. Figs. S and T show more correctly the characters of the individual 

 teeth of the genus, the general arrangement being as in Patula. The mem- 

 brane is long and narrow, the teeth are as in the genus Vertigo described be- 

 low ; excepting that in Pupa, the central tooth is quite small in proportion to 

 the laterals. The marginal teeth are irregularly denticulated, the inner den- 

 ticle the largest. 



SUBGENUS PUPILLA, LEACH. 



Animal, as in the genus, small, short; tail short, pointed ; eye-peduncles long; 

 tentacles stout, very short. 



Shell deeply rimatc or perforate, cylindrically shortened, apex extended 

 into an obtuse cone ; horn-colored, smooth ; whorls 5 - 9 ; aperture rounded 

 with few or no folds ; peristome somewhat expanded. 



Pupa muscorum, LIN. 

 Vol. III. PL LXX. Fig. 3. 



Shell perforate, cylindrical, subfusiform, obtuse at both extremities ; epider- 

 mis dark chestnut-color or bay ; whorls 6 to 7, rounded, the anterior 4 of 

 about equal diameter; suture deep; aperture lateral, nearly circular, small, its 

 diameter equal to two thirds of the diameter of the last whorl, a thin, testa- 

 ceous deposit forming a thickened margin internally, sometimes bearing an ob- 

 tuse tubercle ; upon the parietal wall is a single tubercle ; transverse margin 

 subreflected ; peristome slightly reflected. Length, 4 mill.; breadth, 1| mill. 



Pupa badia, ADAMS, Bost. Journ. Nat. Hist, III. 331, PL III. Fig. 18 ; Shells of 



Vermont, 157. GOULD, Bost Journ. Nat. Hist, III. 404; IV. 360. DEKAY, 



N. Y. Moll., 49, PL IV. Fig. 45. CHEMNITZ, ed. 2, 117, PL XV. Figs. 25-29. 

 I'.IN-XKY, Terr. Moll., 323, PL LXX. Fig. 3. W. G. BINNEY, Terr. Moll., 



IV. 142. 

 Pupa muscorum, LINNJEUS, part, PFEIFFER, Mon. Hel. Viv., IV. 666, etc. W. 



G. BINN., L. & Fr.-\V. Sh., I. 234 (1869). GOULD and BINN., Invert of Mass., 



ed. 2, 433 (1870). 

 Papilla badia, MORSE, Journ. Portl. Soc., I. 37, Figs. 89, 91, PL X. Fig. 92 



(1864) ; Amer. Nat, I. 609, Fig. 52 (1868). TKYON, Am. Journ. Conch., III. 



302 (1868). 



A circumpolar species, in our limits found in the Northern Region, on the 

 islands in the Gulf of St. Lawrence, and in Maine, Vermont, and New York ; 



