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 iit 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 Thijsanophora Strebel and Pfeffer for the section. It was pro- 

 posed for JNIexican species which are essentially similar to the 

 West Indian forms. * 



PLANORBIS cultratus d'Oibigny. 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 4j 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-strife 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. Me.x. et VAvier. Cent, 

 vol. ii, p. 68 ; Strebel Beitrag zur Kenntniss der Fauna Mex., p. 46, 

 (as "Planorbis nov. spec?"); and Orbigny's Mollmques 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. 



