THE NAUTILUS. 63 
ZONITES (Guppya?) gundlachi Pfr. 
This species is now for the first time recorded from west of the 
Gulf. Mr. Singley collected it at Hidalgo, Texas. 
PATULA (Microphysa) incrustata Poey. 
Found by Mr. Singley at Hidalgo, Texas. Heretofore recorded 
from Galveston and Corpus Christi. At the former locality I was 
unable to find the species when there several years ago; and Mr. 
Singley writes me that he did not get it at the last-named place, 
although special search was made. 
My attention has been called to the fact that the name Microphysa 
is preoccupied. If a change is necessary, it is likely that we can 
use Thysanophora Strebel and Pfeffer for the section. It was pro- 
posed for Mexican species which are essentially similar to the 
West Indian forms. 
PLANORBIS cultratus d’Orbigny. Figures 1, 2, 3. 
This is a small form, flatter than any other United States species, 
very acutely keeled at the circumference ; outer whorl convex above 
(considering the shell dextral), the spire slightly concave; almost 
perfectly flat beneath. There are about 43 whorls on the largest 
specimen before me, very slowly and regularly widening (seen from 
beneath) ; the aperture is oblique, narrow, angular. The surface is 
finely marked by growth-strize and has the faintest possible indica- 
tions of spiral sulci near the peripheral keel. Diameter 4 mill. ; 
altitude .65 mill. The specimens are from Hidalgo, Texas, sent by 
Mr. Singley. The species has been found in the Mexican State of 
Vera Cruz, in Guatemala and Venezuela. It was described from 
Cuba. The insular form is decidedly larger than the Mexican 
shells, or than ours, measuring 9 mill. diam. For the bibliography 
of the species consult Crosse & Fischer, Moll. Mex. et ? Amer. Cent., 
vol. ii, p. 68; Strebel Beitrag zur Kenntniss der Fauna Mex., p. 46, 
(as “ Planorbis nov. spec?”); and Orbigny’s Mollusques de Cuba. 
Mr. Ralph Tate in his article on Nicaragua shells (in Amer. 
Journ. Conch., vol. v, p. 158) calls this species “ P. kermatoides.” 
One of his specimens is before me. The real kermatoides Orb. is a 
much larger shell. 
