NO. 2 PYRAMIDELLID MOLLUSKS — BARTSCH 33 



The finer ribbing and detailed spiral sculpture readily distinguish 

 this species from Mormula marshalli (p. 31). 



I take pleasure in naming this species for Prof. G. D. Harris, of 

 Cornell University, who has not only contributed much to our knowl- 

 edge of geology, but has also trained a host of students to continue 

 his researches. He is also the founder of the Paleontological Research 

 Institute at Cornell University, 



MORMULA PALMERAE, new species 

 Plate S, figures 4a, b 



Shell elongate-turrited, cream-yellow. The early whorls in all our 

 specimens are decollated; those remaining are slightly rounded and 

 crossed by very stout, protractively slanting axial ribs, which are of 

 the same strength from the summit to the periphery, where they 

 terminate. Of these ribs, 12 are present upon the first three of the 

 remaining whorls, 14 upon the fourth, 16 upon the fifth, and 17 upon 

 the last turn. At irregular intervals some of the ribs are thickened 

 to form a varix. The intercostal spaces are well impressed and about 

 as wide as the ribs. They are crossed by five pits, of which the first 

 near the summit and the fourth are about half as wide as the rest; 

 the space between the summit and the first pit is about as wide as 

 that between the first and second and third and fourth, while the space 

 between the second and third and fourth and fifth are of about half 

 the width of the rest. The suture is strongly impressed 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 

 subquadrate; the columella is rather stout, reflected, vertical, and 

 bears a strong fold a little below its insertion; the parietal wall is 

 glazed with a thin callus ; the outer lip in the specimen before us shows 

 some ill-defined indications of spiral cords deep within. 



The type, U.S.N.M. No. 561690, comes from the Pliocene of 

 North St. Petersburg, Fla. Its 6.2 whorls remaining measure: 

 Length 7.5 mm., diameter 2.0 mm. U.S.N.M. No. 561691 contains 

 another fragment, and a third specimen is in the collection of the 

 A.N.S.P. 



This species is readily distinguished from Mormula harrisi (p. 32) 

 by its much stouter axial ribs and intercostal sculpture. 



I take pleasure in naming this species for Dr. K. V. W. Palmer, 

 Dr. Harris's able associate and successor as director of the Paleonto- 

 logical Research Institute at Cornell University. 



