154 BULLETIN OF THE 
Triodopsis Levettei, Branp. (p. 314.) 
Plate I. Fig. E. 
Shell umbilicate, orbiculate-convex, thin, shining, translucent, slightly and 
irregularly obliquely striated, chestnut-colored, the upper whorls paler ; spire 
searcely elevated, apex obtuse ; suture impressed ; whorls 7, rather convex, 
gradually increasing ; the last somewhat depressed at the aperture, obsoletely 
spirally striated, constricted behind the aperture, and slightly scrobiculated, 
base subconvex ; umbilicus moderate, } diameter of the shell, pervious ; 
aperture very oblique, subcircular, with a well-developed flexuose, transverse 
white tooth on the parietal wall; peristome reflected, pale chestnut-colored, 
thickened within, the margins joined by a slight callus, the right margin with 
a white, obtuse, erect, submarginal tooth, the basal margin with two white 
transverse teeth, the upper one the larger. 
Triodopsis Levetteit, Buanp, Ann. N. Y. Acad. Sci., Vol. II. No. 4, p. 116, Fig. 
(1880). 
Near Santa Fé, New Mexico, where two living and one dead specimen were 
collected by my friend, Dr. G. M. Levette, who presented to me one of the 
former. Cabinet of Dr. Levette, and the Binney and Bland collection in the 
American Museum of Natural History, New York. 
This species is quite distinct from any known North American or other 
form. The number of whorls, and of teeth, their form and color, with the 
color of the shell and peristome, are its peculiar features. The strie are by no 
means so well developed as shown in the figures. (Bland.) 
The figures are copied on my plate. 
Von Martens suggests that the species may be a Polygyra. 
Mesodon. (p. 314.) 
All the specific names should have the masculine termination. 
Mesodon Andrewsi, W. G. Bryn. (p. 524.) 
Plate Il. Fig. L. Plate III. Fig. E, F. 
Shell imperforate, globose, very thin, with delicate wrinkles of growth and 
microscopic revolving strie ; horn-color; spire elevated, conic, apex obtuse ; 
whorls six, convex, the last greatly swollen; peristome white, thickened, 
slightly reflected, ends separated, the columellar one expanded. Greater diam- 
eter, 25 mm. ; lesser, 20 mm. ; height, 14 mm. 
Mesodon Andrewsi, W. G. Brxy., Ann. N. Y. Acad. Sci., Vol. I. p. 360, Pl. XIV. 
Fig. E, F, Pl. XV. (1879). 
Roan Mountain, Mitchell Co., North Carolina. Mrs. G. Andrews. The 
on 
