NO. 2 PYRAMIDELLID MOLLUSKS — BARTSCH 3I 



where they terminate. Of these ribs lo are present upon the first 

 two of the remaining turns, ii upon the third; 12 upon the fourth, 

 and 14 upon the rest of the whorls. At irregular intervals some of 

 these ribs become thickened to form a varix. The intercostal spaces 

 are deeply impressed and a little wider than the ribs. The intercostal 

 spaces are marked by 20 incised spiral lines and grooves, which vary 

 decidedly in strength and spacing. They are best visualized by ex- 

 amining the detailed sketch on plate 4, figure 8b. The suture is well 

 constricted and rendered wavy by summits of the axial ribs. The 

 periphery is well rounded. The base is short, strongly rounded, 

 smooth, and without sculpture. The aperture is subquadrate; the 

 anterior portion of the columella and basal lip are broken; the upper 

 part of the columella is thick, and provided with a weak fold; the 

 parietal wall is glazed with a thin callus; the fractured outer lip is 

 thick. 



The type, U.S.N.M. No. 561685, comes from the Pliocene of 

 North St. Petersburg, Fla. It has 8.2 whorls remaining and measures : 

 Length 5.1 mm., diameter 1.8 mm. 



The less rounded whorls and entirely different spiral sculpture 

 easily distinguish this species from Mormula cookei (p. 30). 



I take pleasure in naming this species for Dr. W. P. Woodring, of 

 the United States Geological Survey, whose exhaustive and masterful 

 report on the fauna of the Bowden beds of Jamaica lent a new im- 

 petus to West Indian and Tropical American paleontology. 



MORMULA MARSHALLI, new species 



Plate 5, figures sa, b 



Shell elongate-turrited, slender, cream-yellow. The early whorls 

 in all our specimens have been lost. Those remaining are slightly 

 rounded and marked by very strong, broad, slightly protractively 

 slanting axial ribs, which are of the same strength from the summit 

 of the whorls to the periphery, where they terminate. Of these ribs 

 14 are present on all the whorls. At irregular intervals some of 

 the ribs become thickened to form a weak varix. The intercostal 

 spaces are a little narrower than the ribs and are crossed by 13 in- 

 cised lines and grooves which vary greatly in strength and spacing 

 and are best visualized by viewing the detailed sketch on plate 5, 

 figure 5b. The suture is slightly constricted and rendered wavy by 

 the summit of the axial ribs. The periphery is well rounded. The 

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

 quadrate ; the columella is thick, vertical, and provided with a strong 



