NO. 2 PYRAMIDELLID MOLLUSKS — BARTSCH 49 



oval, columella slender, gently curved and provided with an oblique 

 fold a little below its insertion, outer lip thin. 



The type, U.S.N. M. No. 561651, comes from the Pliocene of North 

 St. Petersburg, Fla. It has 8.1 whorls remaining and measures: 

 Length 5.2 mm., diameter 2.2 mm. U.S.N.M. No. 561652 contains 

 another specimen that has furnished the description of the nucleus. 

 A third specimen is in the collection of the A.N.S.P, 



The rather large size and elongated shape, as well as detailed spiral 

 sculpture, will readily differentiate this from Pyrgiscus harmoniae 

 (below). 



PYRGISCUS HARMONIAE, new species 

 Plate 9, figures 8a, b 



Shell rather large, turrited, elongate-conic, cream-yellow. The 

 nucleus consists of about 2.5 strongly rounded whorls, which form a 

 moderately elevated helicoid spire whose axis is at right angles to that 

 of the postnuclear spire. The postnuclear whorls are much wider at 

 the periphery than the summit. The first postnuclear whorl is smooth ; 

 the rest are marked by strong, retractively slanting axial ribs, of 

 which 20 are present upon the second to sixth, 21 upon the seventh, 

 22 upon the eighth, and 24 upon the last whorl. The intercostal 

 spaces are about as wide as the ribs and are crossed by seven incised 

 spiral pits which are subequal, excepting the first which is only about 

 half the width of the rest. The spacing of these pits is best described 

 in our detailed sketch, plate 9, figure 8b. The suture is moderately 

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

 base is hemispherical, smooth. The aperture is obliquely oval ; the 

 columella is short, slender, curved and provided with an oblique fold 

 a little below its insertion; the outer lip is thin. 



The type, U.S.N.M. No. 561653, comes from the PHocene of North 

 St. Petersburg, Fla. It has lost the nucleus ; the 9 postnuclear whorls 

 measure: Length 4.7 mm., diameter 1.2 mm. U.S.N.M. No. 561654 

 contains a young specimen, which has furnished the description of 

 the nucleus. 



The decidedly retractively slanting axial ribs and different spiral 

 sculpture readily distinguish this species from Pyrgiscus cadmusi 

 (below). 



PYRGISCUS CADMUSI, new species 



Plate 9, figures 6a, b 



Shell small, turrited, elongate-conic, cream-yellow. The nucleus 

 consists of about 2.5 strongly rounded whorls that form a moderately 



