148 THE CHICAGO ACADEMY OF SCIENCES. 
tivity, taking a long time to come from its shell, even when 
immersed in water for a considerable time. When extended it 
will retract at the slightest jar. It does not readily crawl about, 
as do many of the smaller species of Polygyra, but rests 
half extended from its shell, twists its head about, raises its 
body high in the air, and constantly feels about with its eye- 
peduncles and tentacles. This species is found in the southern 
and western regions. 
My friend, Mr. George H. Clapp of Pittsburg, Pennsylva- 
nia, has questioned the propriety of changing this well-known 
name and has offered very weighty reasons for the rejection of 
fraudulenta, With a view to prove or disprove the validity of 
the change I hunted up all the references to this species in 
American works (Tryon, the two Binney’s, Pilsbry, etc.), andalso 
carefully read the original descriptions of Say. After a care- 
ful perusal of these, and a comparison of numerous specimens, 
I am of the opinion that the change is valid, although Say’s 
description is rather ambiguous. I believe the curved parietal 
tooth refers to zntroferens rather than to fallax. It is my opin- 
ion that Say had before him specimens of both fal/ax and intro- 
ferens, and that he intended his type to be the zntroferens-like 
shell. It may be remarked, however, that the truth of the 
matter is that without the actual type, which is not now in ex- 
istence, nothing can be definitely settled concerning what Say 
really meant by his description, as it will fit pretty well both 
fallax and introferens. 
54. Polygyra profunda Say, pl. xxix, figs. 8, 10, 11. 
Helix profunda SAy, Journ. Phil. Acad., Vol. II., p. 160, 1821. 
Flelix richardi FERUSSAC, Tab. Syst., p. 43; Hist., pl. lxx (three lower 
figures). 
Helix bulbina DESHAYES, in Ferussac Hist., Vol. I, p. 108, pl. Ixxxv, 
figs. 14-18. (Junior?) 
Polygyra profunda alba WALKER. Terr. “Moll. Mich., p. 12, 1899 (va- 
riety). 
Shell: Depressed, rather solid, widely umbilicated; sur- 
face covered with numerous coarse, oblique, rib-like growth 
lines which are crossed by numerous very fine spiral lines; 
nucleus without markings; periphery rounded; sutures deeply 
impressed; color yellowish horn, with one well-defined brown 
band above the periphery, and one wide or two narrow fainter 
bands below the periphery; the shell may also be uniform horn- 
color, brown, albino, or there may be a peripheral wide band 
