52 THE NAUTILUS. 
A NEW TEINOSTOMA. 
BY HENRY A. PILSBRY. 
Teinostoma Hidalgoana n. sp. 
Shell orbicular, depressed, solid, bright, bluish-white. Spire very 
low, wide-conic, the apex acute. Whorls 23, hardly convex, the 
last large, rounded at periphery, depressed beneath ; on its latter 
third the periphery descends toward the base, and immediately 
behind the lip is decidedly pinched into a short rounded keel. Sur- 
face closely engraved throughout with spiral lines of close, fine 
stippling or punctation. Aperture oblique, rounded, except for the 
straight parietal wall; peristome continuous, the outer lip thick, 
blunt, strengthened outside by a heavy rib or collar a short distance 
behind the edge; parietal wall bearing a low nodule or tooth near 
its upper termination. Parieto-umbilical callus heavy, deeply and 
coarsely pitted all over, forming a rounded lobe over the umbilical 
tract and a band in front of the parietal edge uf peristome proper. 
Alt. 2, diam. 3°2 mm. 
Singapore (Dr.S.Archer!). This exquisite species is respectfully 
dedicated to Dr. J. G. Hidalgo, of Madrid, author of numerous valu- 
able contributions to malacological science. 
One specimen of the type lot is much smaller than the others (diam. 
2 mm.), but in all other respects exactly resembles them, and has the 
lip of a fully mature shell. 
NOTES ON THE SMALLER AMERICAN PLANORBES. 
BY E. G. VANATTA. 
Including the species put in the sub-genera Menetus and Gyraulus- 
by Binney in “ Land and Fresh-water Shells of the United States.” 
The smaller species of Planorbis are, as a general rule, found on 
leaves and sticks in small ponds and springs. 
The Western Slope species are centervillensis, opercularis, opercu- 
laris var. oregonensis and callioglyptus. 
P. alabamensis Pils. has so far been found only in Woodville, 
Alabama, and Grove, Cooper River, 8. C. 
P. sampsoni has been found hitherto only in Pettis and Henry 
Co., Mo., and Athens, II. 
