b PKOCEEDINGS OF THE NATIONAL MUSEUM vol. 79 



spiral is a little wider than that between the medial and the anterior 

 spiral. Body whorl with 11 spirals, which slightly decrease in 

 strength anteriorly. A very weak spiral lies adjacent to and behind 

 the suture. Very weak axial growth lines intercalate the spirals. 

 Aperture rather narrow; margin of outer lip broken off; within 

 marked with weak entering lirations. Columella bearing two oblique 

 folds, the posterior being much the stronger and situated near the 

 middle of the aperture. The anterior plication is situated near the 

 lower border of the columella. 



Dimensions. — Holotype (U.S.N.M. No. 371346) measures: Length, 

 4.2 mm. ; diameter, 1.7 mm. ; length of aperture, 1.7 mm. 



Tyj)e locality. — Tamiami Trail, 42 miles west of Miami, Fla. 



The material consists of one nearly perfect specimen — the holo- 

 type — and a fragment of another shell. 



The new species differs from Mitromorpha pygmaea Dall, a Plio- 

 cene species, in having a more slender shell, which is sculptured on 

 the spire whorls with three spirals instead of four. Mitroniorpha 

 mitrodita Gardner and Aldrich, a species occurring in the Duplin 

 marl, N. C, has axial costae and four spirals on the spiral whorls. 



CYPRAEA CAROLINENSIS FLORmANA, new subspecies 



Plate 1, Figxjres 2, 6, 7 



Description. — Shell rather large, solid, and subelliptical in out- 

 line. Dorsal area well rounded; ventral area slightly rounded. 

 Aperture wide, more expanded below than above. Posterior com- 

 missure wide and deep. Teeth strongly developed on both lips. 

 The holotype has 24 teeth on the outer lip and 17 on the inner. 

 The number of teeth on the outer lip of paratype specimens ranges 

 from 21 to 24, and on the inner lip, 16 to 18. 



Dimensions. — Holotype (U.S.N.M. No. 371333) measures: Length, 

 80 mm. ; diameter, 48 mm. ; dorso-ventral diameter, 34.5 mm. Fig- 

 ured paratype measures : Length, 69 mm. ; diameter, 45.5 mm. ; dorso- 

 ventral diameter, 23 mm. 



Type locality. — Tamiami Trail, 42 miles west of Miami, Fla. 



The subspecies differs from Cypraea carolhiensis Conrad in hav- 

 ing a more rounded ventral area. One specimen collected by the 

 writer from the Duplin marl at Station 11831, 5 miles west of 

 Faison, Sampson County, N. C, agrees in detail with the Florida 

 specimens. 



TURRITELLA PONTONI, new species 



Plate 2, Figures 4, 5, 7 



Description. — Shell rather large, solid, acute, having an apical 

 angle of 19° and consisting of 11 whorls on the holotype. Whorls 



