PUPA. 197 



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

 are copied below. 



The law is low, wide, arcuate (in P. riipicola. 



' . , . Fig- 100. 



strongly arched) ; ends but little attenuated in mus- ^ 



corum, pentodon, fallax, rupicola^ acutely pointed ^^rj^^^^^^^^ _^_^ "^^^^^ 



in corticaria ; a more or less developed, broad, ^"^ — .^^^'^^^ '"^'*u_> 



,, ,. . . ,, ,,. , Jaw of Pura 6arf/o (MorBc). 



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 nan'ow, the teeth arc 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 rimate 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, Liisr. 

 Vol. III. PI. 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 bearino- an ob- 

 tuse tubercle ; upon the parietal wall is a single tubercle ; transverse maro-in 

 subreflected ; peristome slightly reflected. Length, 4 mill.; breadth, \\ mill. 



Pupa hadia, Adams, Bost. Journ. Nat. Hist., III. 331, PI. IIL Fig. 18 ; Shells of 



Vermont, 157. — Gould, Bost. Journ. Nat. Hist., III. 404; IV. 360. — DeKay, 



N. Y. Moll., 49, PI. IV. Fig. 45. — Chemnitz, ed. 2, 117, PI. XV. Figs. 25-29! 



— BiNNEY, Terr. Moll., 323, PI. LXX. Fig. 3.— W. G. Binney, Terr. Moll., 



IV. 142. 

 Pupa muscorum, Linn^us, part, Pfeiffer, Mon. Hel. Viv., IV. 666, etc. W. 



G. BiNN., L. & Fr.-W. Sh., I. 234 (1869). —Gould and Binn., Invert of Mass., 



ed. 2, 433 (1870). 

 Pupilla hadia, Morse, Journ. Portl. Soc, I. 37, Figs-. 89, 91, PI. X. Fig. 92 



(1864) ; Amer. Nat., I. 609, Fig. 52 (1868). — Tryon, 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 ; 



