THE NAUTILUS. 



b5 



Solid and stroiiir. opiujiie. The specimens are dead, lusterle.<s and 

 destitute of epiderinif^, of a dirty-white color with either (1) a 

 single narrow peripheral brown girdle, the umbilicus brown in- 

 side, or (2) abroad brown girdle 

 encircling the middle of the 

 whorl, or (3) the up])er surface 

 of the last whorl brown except 

 for a light girdle just above the 

 periphery, below which there is 

 a broad zone, its lower edge fad- 

 ing out on the base, the periph- 

 ery itself marked l)y a narrow 

 darker band ; in all the forms 

 the umbilicus is brown inside and 

 the whorls of the spire light, the 

 apex somewhat rufous. The su r- 

 fsice has very coarse and uneven, 

 irregular, oblique stride above ; 

 they are weaker below ; and 

 under a lens, close incised spiral 

 lines become visible, making the 

 surface granulate; they are 

 nearly obsoleteon thebody-whorl, 

 but usually distinct inside the 

 umbilicus and on the earlier 

 whorls. The spire is low, ob- 

 tuse ; sutures deeply impressed. 

 Whorls 6, slowly widening, the 

 inner three somewhat pi'otruding 

 above the outer; the last whor 

 very convex above, obsoletely angled on its earlier portion, becoming 

 rounded, shortly but decidedly deflexed in front. Aperture very 

 oblique, rounded-lunate ; peristome expanded on its outer margin, 

 reflexed, blunt and much thickened on the basal and columellar 

 margins. Umbilicus deep, permitting one to see to the apex, and 

 funnel-shaped. 



Alt. 22, greater diam. 42, lesser 37 mm. ; width of umbilicus 8 

 mm. ; oblique alt. of mouth (meas. outside perist.) 21, width 21 mm. 

 Another specimen measures : Alt. 22, diam. 45 mm. 



