140 THE NAUTILUS. 
and have seen what I believed to be unios hanging from the feet v1 
others flying overhead. What has come under my individual obser- 
vation fwice must have happened thousands of times. How else could 
Unionide from the Mississippi drainage get into Florida ? 
OS 
DESCRIPTIONS OF NEW AMEBICAN LAND SHELLS. 
BY HENRY A. PILSBRY. 
Gastrodonta coelaxis, n. sp. 
Shell rather widely umbilicate, the width of umbilicus contained 6 to 
6% times in the greatest diameter of the shell; thin, somewhat fragile, 
yellow-corneous, sub transparent, the last suture readily visible through 
the base; much depressed, the periphery subangular, upper surface 
convex ; surface glossy, sculptured with irregular wrinkles in the di- 
rection of growth lines above, almost smooth beneath, and in favorable 
lights showing subobsolete spiral striz. Whorls 63, slowly widening 
a little convex, the last moderately convex below. Aperture oblique 
irregularly lunar, deeply excised by the preceding whorl, not calloused 
inside, two-toothed a short distance within; one thin and rather short 
lamella projecting from the lower part of the outer wall, and another 
smaller one from the middle of the baso-columellar wall; both some- 
times wanting; pristome thin and sharp, the outer margin well 
rounded, baso-columellar margin straightened. Umbilicus well-like, 
but widening at the opening and showing the penultimate whorl. Alt, 
3, diam. 6 to 62 mm. 
Cranberry, North Carolina (Mrs. George Andrews). 
This species adds another to the long series of mountain snails dis- 
covered by Mrs. Andrews, whose success in finding new and rare 
species has been remarkable. Future students of the snails of this 
“Cumberland” mountain region will always gratefully remember two 
ladies who have done much of the pioneer work—Mrs. ANDREWS 
and Miss Law. 
G. coelaxis is intermediate between G. gularis (Say) and G. las- 
modon (Phill). It is more widely umbilicate than the former and has 
a narrower umbilicus than the latter species. There is no callus 
within the basal lip, such as shows a yellowish blotch in most speci- 
mens of gularis. 
This species is perhaps what Mr. Binney identified as Zonites ma- 
cilenta Shuttl. in First Supplement to Terr. Moil. V, p. 143, but is 
not the macilenta ot Shuttleworth, which is an absolute synonym of 
