32 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I25 



fold at its insertion ; the parietal wall is glazed with a thin callus ; the 

 outer lip is thick and provided with 4 strong spiral folds deep within. 



The type, U.S.N.M. No. 561686, comes from the Pliocene of North 

 St. Petersburg, Fla. It has 9.5 whorls remaining which measure: 

 Length 6.0 mm., diameter 1.7 mm. U.S.N.M. No. 561687 contains 

 an additional specimen from the same source and another is in the 

 collection of the A.N.S.P. 



The much narrov/er intercostal spaces and different spiral markings 

 will readily distinguish this species from Mormula woodringi (p. 30). 



I take pleasure in naming this species for William B. Marshall, 

 my colleague, who was the able assistant curator of the division of 

 moUusks for many years. 



MORMULA HARRISI, new species 

 Plate 5, figures la, b 



Shell elongate-turrited, cream-yellow. The nucleus consists of a 

 little more than 2 strongly rounded, smooth whorls that form a de- 

 pressed helicoid spire whose axis is at right angles to that of the 

 postnuclear spire, in the first whorl of which the nucleus is about 

 one-third immersed. The postnuclear whorls are almost flattened 

 and crossed by moderately strong axial ribs, which have the same 

 strength from the sum.mit to the periphery, where they terminate. 

 Of these ribs 16 are present upon the second to fifth whorl; 17 upon 

 the sixth; 18 upon the seventh, and 20 upon the rest of the whorls. 

 At irregular intervals some of the ribs become thickened and form a 

 weak varix. The intercostal spaces are about as wide as the ribs and 

 are crossed by 26 incised lines or pits which vary greatly in width 

 and spacing and are best described by our detailed sketch (pi. 5, 

 fig. lb). The suture is well marked and rendered wavy by the axial 

 ribs at the summit of the whorls. The periphery is well rounded. The 

 base is hemispherical and without sculpture. The aperture is sub- 

 quadrate; the columella is slender, vertical, slightly revolute and 

 provided with a weak fold at its insertion ; the parietal wall is glazed 

 by a thin callus; the outer lip is thin, gently curved, and shows no 

 internal cords. 



The type, U.S.N.M. No. 561688, comes from the Pliocene of North 

 St. Petersburg, Fla. It has 10 postnuclear whorls and measures : 

 Length 6.0 mm., diameter 2.4 mm. U.S.N.M. No. 561689 contains 

 three specimens from the same source, and four more are in the 

 collection of the A.N.S.P. 



