NO. 2 PYRAMIDELLID MOLLUSKS — BARTSCH 83 



I take pleasure in naming this species for Miss Anne Harbison, one 

 of the coauthors of the main volume, Bulletin 8, the Pliocene Mollusks 

 of Southern Florida. 



EULIMASTOMA OLSSONI, new species 

 Plate 1 6, figure 5 



Shell small, elongate-conic, cream-yellow. The nuclear whorls are 

 deeply obliquely immersed in the first postnuclear turn, above which 

 the tilted edge of the last whorl only projects. The postnuclear whorls 

 are slightly rounded and bear a keel about one-third of the width of 

 the turns above the suture. Suture strongly constricted. The base is 

 strongly rounded, with a mere umbilical chink. The surface of the 

 shell is without sculpture. The aperture is ovate; the columella is 

 slender, curved, and bears a strong spiral fold at its insertion; the 

 parietal wall bears a strong callus which renders the peritreme com- 

 plete; the outer lip is thin and gently curved. 



The type, U.S.N.M. No. 561679, comes from the Pliocene of North 

 St. Petersburg, Fla. It has 5.8 whorls and measures : Length 2.1 mm., 

 diameter 0.8 mm. 



The small size and absence of an open umbilicus will easily dis- 

 tinguish this species from Eulimastoma harbisonae (p. 82). 



I take pleasure in naming this species for Axel A. Olsson, one of 

 the coauthors of Bulletin 8. 



Genus ODOSTOMIA Fleming 



1813. Odostomia Fleming, Edinburgh Encycl., vol. 7, pt. i, p. 76. 

 1839. Odontostomia Jefifreys, Mai. and Conch. Mag.. 1939, pt. 2, p. 34. 

 1886. Ptychosf onion Locard, Prodrome des mollusques de France, pp. 228, 571. 

 1892. Tiirrifodostomia Sacco, I MoUuschi . . . del Piemonte e della Liguria, 

 p. 41. (same type). 



Shell with sinistral apex, usually short, few-whorled, subconic or 

 ovate, with a single columellar fold which varies in strength and some- 

 times is not apparent at the aperture. The sculpture varies from 

 smooth in Odostomia to spirally Urate in Evalea. 



Type : Turbo plicatus Montagu. 



KEY TO THE SUBGENERA OF ODOSTOMIA 



Shell with spiral striations Evalea 



Shell without spiral striations Odostomia 



