THE NAUTILUS. 11 



blunt, always more or less eroded; there are about four whorls 

 in the adult with indications of about five resting stages; the 

 surface is smooth except for inconspicuous lines of growth; the 

 young are somewhat naticoid, with a small umbilicus, but this 

 shape rapidly changes; the whorls enlarge rapidly, being as it 

 were appressed toward the suture which is distinct but not 

 channeled, while the umbilicus becomes relatively larger and 

 more or less funicular; the aperture is egg-ovate, entire, the 

 posterior commissure solidly filled with callus, the outer lip 

 internally thickened, patulous not reflected; the inner thickened, 

 continuous over the body; height of shell 33; of last whorl 31; 

 of aperture 23; maximum diameter (in front of the middle of 

 the whorl) 26 mm. U. S. Nat. Mus. Cat. No. 332780. 



Habitat. Rio Uruguay, Department of Paysandu. 



The operculum is horny, concentric, with the nucleus at the 

 inner third; the radula is typically Ampullarioid and might be 

 quite accurately represented by Troschel's figure of the radula 

 of A. urceuSj in the "Gebiss der Schnecken." 



The literature has been carefully searched, both on the lines 

 of Ampullaria and Campeloma, but nothing of the sort has been 

 discovered. 



The subgenus is named in honor of Doctor Florentine Felip- 

 pone, whose energy and interest in exploring the fauna of 

 Uruguay are deserving of great praise. 



The peculiar form of this species, and its funicular umbilicus, 

 so' different from that of any other in the genus, seem to authorize 

 its separation. 



A NEW SPECIES OF PHYSA FEOM NEW YOBK STATE. 



BY FRANK C. BAKER. 



PHYSA ONEIDA n. sp. Shell of medium size, ovate, slightly 

 inflated; whorls about five, slowly increasing in diameter; spire 

 short, broad, the whorls flattened; color yellowish-horn; surface 

 smooth and shining, with rarely a trace of spiral striae, but the 



