12 THE NAUTILUS. 



lines of growth may form more or less marked raised lines in 

 some specimens; sutures slightly impressed, bordered below by 

 a wide white band; protoconch smooth, rounded, rich wine 

 color; aperture long-ovate, twice the length of the spire; peri- 

 stome bordered within by a thickened rib edged with dark 

 brown; columella thickened, slightly twisted; parietal wall 

 covered by a thin callus which is folded over into and com- 

 pletely closing the umbilical region. 



Length, 11.0; width, 7.5; aperture length, 8.0: width, 

 3.5 mm. Type. 



Length, 13; width, 8.5; aperture length, 10.5 mm. Para- 

 type. 



Length, 10.5; width, 7.2; aperture length, 7.5; width, 

 3.7 mm. Paratype. 



Length, 15.0; width, 9.0; aperture length, 11.0; width, 

 5.0 mm. Paratype. 



This Physa has been included under warreniana Lea by the 

 writer for a number of years. It is a small edition of that 

 species agreeing in outline with Lea's figure and description in 

 all essential details except size (see Lea's Observations, xi, p. 

 120, pi. 24, fig. 81). Lea's species, however, differs not only 

 in size but has strong spiral lines on the surface which are ab- 

 sent in oneida. The shell in the smaller species is also more 

 swollen and less cylindrical, and the spire is more depressed 

 than in tvarreniana. It resembles ancillaria and has been con- 

 stantly associated by the writer with that species as a variety. 

 The shell is not as broad as ancillaria and the whorls are not 

 shouldered. It perhaps more nearly resembles Walker's an- 

 cillaria crassa, but differs constantly in being less solid, lacking 

 the variceal bands, the body whorl is less swollen, the columella 

 is not as heavy, the spire is higher, the outer lip is not as much 

 arched, and the aperture is more elongate. The color of crassa 

 is purplish-white with an opaque texture while oneida is 

 yellowish-horn, polished, with a translucent texture. Hetero- 

 stropha has a longer, more acute spire, a rounder aperture, 

 somewhat shouldered whorls, and a more twisted columella. 

 There is some variation in oneida in the height of the spire, im- 

 mature specimens having a somewhat longer spire than mature 



