t^ 



The Nautilus. 



Vol. XXIV. JUNE, 1910. No. 2 



A NEW CLAIBOBNIAN SHELL. 



BY REV. H. E. WHEELER. 



OvDLACTiEON ALDRICHI, n. S{). 



Shell minute, subcypraeform, thick, longitudinally sculptured with 

 distinct grooves very closely set, and terminated by the broad oblique 

 callus on the body whorl ; periphery of the apical region smooth, well 

 rounded, the diameter of the perforation being contained in the 

 width of the shell about four times; aperture linear, very contracted, 

 elevated; outer lip thickened, reflected over and close to the apical 

 perforation, and produced downward on the body whorl ; furnished 

 behind with an oblique, rather deep furrow, which is parallel to the 

 labial contour, and terminating at the callus, a similar, less promi- 

 nent rectilinear furrow directly in front. 



Length 4 mm. ; width 2 mm. 



Type (No. 779, Col. Wheeler) from the Ferruginous Sand Bed, 

 Claiborne, Alabama. Co-type in the collection of Hon. T. H. 

 Aldrich. 



The genus to which this shell belongs is new to Eocene paleon- 

 tology. Thus far it is represented only by O. meeki Dall, a recent 

 form dredged oflf the coasts ot Cuba and the Bahamas. The genus 

 is thus characterized by Dr. Dall : * 



" Shell cypraeform, involute ; with an apical perforation as in Bulla ; 



'Bull. Mus. Comp. Zool. Cambridge, vol. xvii, 1889, p. 42. 



