1S03.] NATURAL SCIENCES OF PHILADELPHIA. 763 



Polygyra suprazonata Pils. PI. LXI, figs. 1, la, 16. 

 Proc. Acad. Xat. Sci. Phila., 1899, p. 393. 

 Tzintzimtzan, State of Michoacan. 



Polygyra rhoadsi Pils. PI. LXI, figs. 2, 2a, 26. 



Proc. Acad. Nat. Sci. Phila., 1899, p. 392. 



Topo Chico, near Monterey, Nuevo Leon. 

 Thysanophora conspurcatella (Morel.). 



Antigua, V. C. 

 Thysanophora impura (Pfr.). 



Antigua, V. C. 



Thysanophora proxima Pils. PI. XLIX, figs. 2, 2a. 

 Proc. Acad. Nat. Sci. Phila., 1899, p. 394. 



Uruapam, Huingo, Patzcuaro and Morelia, in the State of Michoacan; 

 the types from the former locahty. 

 Thysanophora horni (Gabb). 



^'ictoria, State of Tamauhpas, in chaparral; Topo Chico, near Mon- 

 terey, Nuevo Leon. The specimens have been carefully compared 

 with the types from Arizona, and are undoubtedly this species, which, 

 when fresh, has a sparsely hairy cuticle. See Nautilus, XIII, 98. 

 It is new to the Mexican fauna. 



Thysanophora coloba Pilsbry. 



Proc. Acad. Nat. Sci. Phila., 1893, p. 403, figs, in text. 



Polvon, department of Chinandega, western Nicaragua (McNiel 

 expedition). A minute species, diam. L8 mm., overlooked by the 

 authors of the Biologia and Mission Scientifiqiie, and inserted here to 

 rescue it from oblivion. 



In this connection it may be mentioned that Pupisoma americanum 

 Mlldff., Nachrhl. d. d. vialak. Ges., 1899, p. 91, is apparently a synonym 

 of Thysanophora caeca. 

 Thysanophora fischeri n. sp. PI. XLIX, figs. G, 6a. 



Shell umbihcate, depressed-conic, thin, pale brown. Surface dull, 

 sculptured with thin cuticular laminse more oblique than the lines of 

 growth. Spire conic, the apex obtuse. Whorls 4, very convex, the 

 last rounded peripherally and beneath. Umbilicus contained about 7 

 times in the diameter of the shell. Aperture quite oblique, rounded- 

 lunate, the peristome thin and simple, columellar margin dilated. 

 Alt. 1.5, diam. 2.4 mm. 



Tamaulipas, in a cafion about 4 miles west of Victoria. Tj^pes No. 

 85,911, A. N. S. P., collected by S. N. Rhoads, 1903. 



This species is almost exactly intermediate between T. granum 



