140 THE NAUTILUS. 



and have seen what I believed to be unios hanging from the feet >>1 

 others flying overhead. What has coine under my individual obser- 

 vation twice must have happened thousands of times. How else could 

 Unionidae from the Mississippi drainage get into Florida? 



DESCRIPTIONS OF NEW AMEBICAN LAND SHELLS. 



BY HENRY A. PILSBRY. 



Gastrodonta coelaxis, n . sp. 



Shell rather widely unibilicate, the width of umbilicus contained 6 to 

 (i| 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 stride. Whorls 6J, slowly w idening 

 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, diani. 6 to 65 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 macilcnta of Shuttleworth, which is an absolute synonym of 



