8 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 95 



KEY TO THE SPECIES OF THE GENUS BLANFORDIA 



Incremental sculpture consisting of closely spaced, well defined threads, .iiitrgra. 

 Incremental sculpture not consisting of closely spaced, well defined threads. 



Outer lip reenforced by a heavy varicial callus japonica. 



Outer lip not reinforced by a heavy varicial callus. 

 Callus of the outer lip merely indicated. 



Shell large ; height more than 7.5 mm bcnsoni. 



Shell smaller ; height less than 7.0 mm simplex. 



BLANFORDIA INTEGRA Pilsbry 



Plate I, fig. 12: plate 2, fig. 2; plate 3, fig. 4 



1924. Blanfardia iiitegra Pilsbry, Proc. Acad. Nat. Sci. Philadelphia, vol. 76, 

 p. 12, fig. 3. 



Shell small, very broadly ovate, thin, semitranslucent, horn-colored 

 with the outer edge of the peristome bounded by a narrow, very dark 

 brown zone ; interior of the aperture of the same color as the exterior. 

 Nuclear whorls 2.2, inflated, strongly rovmded, very finely granulose 

 when viewed under high magnification, forming a rather blunt apex. 

 Postnuclear whorls 2.9 in the specimen figured, strongly inflated. 

 The first turn at its junction with the nuclear whorl marked by almost 

 axial riblets, which slant retractively and which gradually become 

 lessened in strength and on the last turn appear as fine axial threads, 

 which are about as wide as the spaces that separate them. These 

 whorls are also marked by faintly incised spiral lines which give to 

 the surface an obscurely granulose effect when viewed under high 

 magnification. Suture .strongly constricted. Periphery inflated, 

 strongly rounded. Base inflated, strongly rounded, moderately openly 

 umbilicated. having the same sculpture as the spire covering it and 

 extending into the umbilicus. Aperture large, very broadly obliquely 

 ovate ; peristome somewhat expanded all around and adnate at the 

 parietal wall to the preceding whorl. Operculum thin with 2.2 whorls. 

 In the radula the rachidian tooth has a strong median cusp bordered 

 by two lesser cusps which decrease regularly in size outwardly. The 

 basals are 4 in number and also decrease regularly outwardly, the 



2-1-2 



formula for this, therefore, being — . The lateral tooth is very 



oblique with a very strong cusp and 2 minute cusps on the inside 

 of this and 4 on the outside, the outer one being extremely small. 

 The first marginal bears 7 denticles which decrease in size from the 

 innermost otitwardly. The outer marginal has 6 denticles with a 

 seventh one indicated on the thinnblike projection on the inside of 

 the denticulated end. 



