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. cmricahuana, 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, pi. 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 XXI, 1907, p. 172 (Tampico) ; Dall, Proc. U. S. Nat. Mus., XIX, 



1896, p. 336. 

 Not Patula horni Gabb, W. G. Binnev, 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. Lye. Nat. Hist, of New York, XI, 1N74. p. 

 151, figs. 



Microphysa ingersolli Bid., W. G. Binnev, Terr. Moll., V, p. 173, fig. 82 

 (shell)'; pi. Ill, fig. V (teeth) ; Man. Amer. Land Shells, 18S5, p. 170, fig. 160. 



Thysanophora ingersolli Bid., Dall, Proc. U. S. N. Mus., XIX, p. 366 (Fly 

 Park); Pilsbry, Nautilus XI, p. 105; J. Henderson, The Molluscs of Colo- 

 rado, Univ. of Colo. Studies IV, Xo. 3, p. 169. 



This species differs from the typical forms of Thysanophora by the 

 absence of cuticular laminae or hairs, the surface being clean and bright, 

 with the appearance of a Vitrea. Under very high magnification 

 some spiral striae 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. 



