1910.] NATURAL SCIENCES OF PHILADELPHIA. 115 
of this snail indicate one of the most distinct Chiricahuan species, a 
penis and its retractor being absent, as in some slugs. 
The lot originally referred to this species consisted of three specimens, 
two being included in Mus. No. 88,886. The soft parts of one of these 
were mutilated and not preserved. The other one has been dissected 
and proves to be A. esuritor. When we were in Barfoot Park near 
the end of November, 1906, snow lay almost knee-deep among the 
big pine trees and living snails were hard to find. Some dead shells 
(No. 97,930), taken in the head of Pine Canyon, may be metamorphosa, 
but we refer them for the present to A. esuritor. No shells known to 
have the anatomical peculiarities of A. metamorphosa have been taken 
since 1904. 
We have found no character in the shell to certainly distinguish 
A. metamorphosa from A. esuritor. The latter varies from forms with 
a nearly simple lip, like A. chiricahuana, to those with various callous 
vestiges of teeth, as shown on the plate, figures 1 to 8. Further 
collections of specimens in the flesh are needed. 
Thysanophora hornii (Gabb). 
Helix hornii Gabb, Amer. jour. of Conch., II, 1866, p. 330, pl. 21, fig. 5 (bad). 
Thysanophora hornii Gabb, Pilsbry, Nautilus XI, 1898, p. 105; XIII, 
Jan., 1900, p. 98; Proc. A. N.S. Phila., 1903, p. 763; 1896, p. 126; Hinkley, 
Nautilus X XI, 1907, p. 172 (Tampico); Dall, Proc. U.S. Nat. Mus., XIX, 
1896, p. 336. 
Not Patula horni Gabb, W. G. Binney, Man. Amer. Land Shells, Bull. 28, 
U.S. N. M., 1885, p. 169. 
Chiricahua Mountains: near Dos Cabezas cave; near Lawhorn’s 
ranch, mouth of Big Emigrant Canyon; White Tail Canyon above 
Stations 4 and 11, rare; Cave Creek Canyon on the slope below the 
cave, at Station 6, and about a half mile up the South Fork. 
Thysanophora ingersolli (Bland). Fig. 24, A, B, C. 
Helix ingersolli Bland, Ann. Lyc. Nat. Hist. of New York, XI, 1874. p. 
151, figs. 
Microphysa ingersolli Bld., W. G. Binney, Terr. Moll., V, p. 173, fig. 82 
(shell) ; pl. ILI, fig. V (teeth) ; Man. Amer. Land Shells, 1885, p. 170, fig. 160. 
Thysanophora ingersolli Bld., Dall, Proc. U. S. N. Mus., XIX, p. 366 (Fly 
Park); Pilsbry, Nautilus XI, p. 105; J. Henderson, The Mollusca of Colo- 
rado, Univ. of Colo. Studies IV, No. 3, p. 169, 
This species differs from the typical forms of Thysanophora by the 
absence of cuticular lamin or hairs, the surface being clean and bright, 
with the appearance of a Vitrea. Under very high magnification 
some spiral strie are visible on the intermediate whorls, but not on 
the first. In the typical form, the aperture is narrowly lunate, the 
spire almost flat, umbilicus nearly one-fourth of the diameter, “ Height 
2.5, diam. 4 mm.” In many Colorado examples the umbilicus is 
narrower, about one-fifth the diameter of the shell. 
