62 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I25 



to the periphery. The intercostal spaces are a little wider than the 

 ribs and are crossed by five spiral cords, which are less strong than 

 the ribs and which render the ribs weakly nodulose. These spiral 

 cords are equally spaced, the first being at the summit and the last 

 immediately adjacent to the suture. The suture is deeply impressed 

 and rendered wavy by the strong nodules at the summit of the 

 whorls. The base is weakly rounded and marked by five spiral cords 

 which are consecutively a little smaller from the one below the periph- 

 ery toward the tip of the columella. The aperture probably is oval; 

 the columella is stout and provided with a weak fold at its insertion ; 

 the parietal wall is covered by a heavy callus ; the outer lip is fractured. 



The type, U.S.N.M. No. 561698, comes from the Pliocene of 

 North St. Petersburg, Fla. It has 6.5 postnuclear whorls and meas- 

 ures: Length 2.1 mm., diameter 0.9 mm. 



I take pleasure in naming this species for Senator Truman H. 

 Aldrich, whose explorations and collecting produced the fine collec- 

 tion now in the care of Johns Hopkins University. 



CHRYSALLIDA WEBERI, new species 

 Plate IS, figure 8 



Shell large, elongate-conic, cream-yellow. The nucleus consists of 

 about 2 strongly rounded whorls, which are obliquely half immersed 

 in the first postnuclear turns. The postnuclear whorls are moderately 

 rounded and crossed by strong, retractively slanting axial ribs, which 

 are equally strong from the summit to the periphery. The intercostal 

 spaces are a little narrower than the ribs and are crossed by five spiral 

 cords, which are not quite so strong as the axial ribs. The junctions 

 of the spiral cords with the axial ribs render these strongly nodulose. 

 The nodules on the 4 upper cords are equally strong while those 

 above the periphery are a little weaker. The suture is rendered wavy 

 by the strong nodules at the summit. The base is almost hemispheri- 

 cal, strongly rounded, and marked by eight spiral cords, of which 

 the upper three are of equal strength, while the rest become consecu- 

 tively weaker, the last being very slender. The spaces between the 

 spiral cords on the base bear many slender axial threads. The aper- 

 ture is large, oval ; the columella is slender and reflected and bears a 

 very strong internal fold at its insertion ; the parietal wall is covered 

 by a thick callus; the outer lip is curved and rendered wavy by the 

 spiral cords. 



The type, U.S.N.M. No. 561699, comes from the Pliocene of North 

 St. Petersburg, Fla. It has lost the nuclear turns ; the 7.5 whorls re- 



