ART. 21 TERTIARY MOLLUSKS FROM FLORIDA MANSFIELD 5 



tude, are broadly conical in outline. Following whorl much larger 

 than preceding and strongly inflated. Body whorl large and sub- 

 cylindrical in outline. Nucleus consists of one smooth, rounded, 

 porcelaneous, terminally flattened whorl. Suture of postnuclear 

 whorls distinct and channeled. Aperture about half the length of 

 shell. Margins of outer lip broken. A heavy wash of callus lies 

 on the inner lip and extends upward on the body whorl nearly to 

 the suture. Columella, within, provided with one fold situated at 

 its lower border, behind which is a shallow depression. No lirations 

 are visible on the inner lip callus. 



Dimensions. — Holotype (U.S.N.M. No. 371331) measures : Altitude, 

 24 mm. ; diameter, 10 mm. ; length of aperture, 12 mm. 



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



The material at hand consists of two specimens. 



The shell of the new species compares in size with the Recent 

 species Olivella rotvmda Dall, but 0. taniiamiensis has a more pro- 

 duced and acuminate spire and lacks the lirations on the inner lip. 



OLIVELLA JUSPmEA GLADEENSIS, new snbBpeciea 



Plate 1, Figxjbe 1 



Description. — Shell large, solid with a moderately acuminate spire, 

 and consists of 6 or 7 whorls. Suture deep, narrow, and channeled. 

 Spire broadly conical; body whorl subcylindrical in outline. Inner 

 lip and face of body whorl provided with a heavy wash of callus. 

 Aperture narrow above and rather wide below. Inner lip callus, 

 except upper area, marked with 18 to 20 lirations. 



Dimensions. — Holotype (U.S.N.M. No. 371332) measures: Alti- 

 tude, 23.5 mm. ; diameter, 9 mm. ; length of aperture, 15 mm. 



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



This subspecies differs from the Recent species Olivella juspidea 

 Gmelin in having a stouter shell with a more acuminate spire and 

 longer body whorl. 



MITROMORPHA GUNTERI, new species 

 Plate 2, Figure 6 



Description. — Shell very small, slender, subfusiform, and consists 

 of 11/^ nuclear and 4 postnuclear whorls. Suture inconspicuous and 

 shallowly depressed. Apical half turn minute ; following turn much 

 larger, smooth, and inflated. Postnuclear spire whorls sculptured 

 with 3 raised, blunt, equisized spirals. The spirals on the two pos- 

 terior whorls are weakly beaded, while the following spirals are 

 nearly smooth. The space between the posterior and the following 



