82 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I25 



The type, U.S.N.M. No. 561668, comes from the Pliocene of North 

 St. Petersburg, Fla. It has 4.5 postnuclear whorls and measures: 

 Length 2.0 mm., diameter 0.9 mm. U.S.N.M. No. 561669 contains 

 an additional specimen from the same source, and another is in the 

 collection of the A.N.S.P. 



This species is easily distinguished from Fargoa calesi (p. 80) by 

 its stout shape. 



This species is named for Harry Archer, who has worked the 

 Pliocene deposits of North St. Petersburg diligently. 



Genus EULIMASTOMA Bartsch 



1916. Eulimastoma Bartsch, Nautilus, vol. 30, p. 73. 



Shells having a strong peripheral keel. 



Type: Odostomia (Eulimastoma) dotella Dall and Bartsch= 

 Odostomia (Scalanostoma) dotella Dall and Bartsch, 1909. 



KEY TO THE SPECIES OF EULIMASTOMA 



Shell openly umbilicated harbisoni 



Shell not openly umbilicated olssom 



EULIMASTOMA HARBISONAE, new species 

 Plate 16, figure i 



Shell small, turrited, pale brown. 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 moderately rounded and rendered strongly angulated at about 

 one-third of the width of the turns above the suture. This angulation 

 is less expressed on the last whorl than on the preceding turns. The 

 suture is strongly constricted. The base is rather long, rounded, and 

 openly umbilicated. The surface of the shell is smooth, with the 

 merest indication of lines of growth and microscopic spiral striations. 

 The aperture is broadly ovate ; the columella is oblique and bears a 

 fold at its insertion; the parietal wall is covered by a thick callus 

 that renders the peritreme complete; the outer lip is thin and gently 

 curved. 



The type, U.S.N.M. No. 561678, comes from the Pliocene of North 

 St. Petersburg, Fla. It has 6.2 postnuclear whorls and measures: 

 Length 2.2 mm., diameter 0.9 mm. 



The larger size and open umbilicus will easily distinguish this 

 species from Eulimastoma olssoni (p. 83). 



