NO. 2 PYRAMIDELLID MOLLUSKS — BARTSCH 79 



from the cord above it is a little wider than the spaces separating the 

 spiral cords on the spire. The base is strongly rounded and marked 

 by four equal and equally spaced moderately strong spiral cords. 

 The aperture is oval; the columella is stout and bears a very strong 

 fold at its insertion ; the parietal wall is glazed by a callus ; the outer 

 lip is fractured. 



The type, U.S.N.M. No. 561723, comes from the Pliocene of North 

 St. Petersburg, Fla. It has 6.3 whorls remaining and measures: 

 Length 4.0 mm,, diameter 1.5 mm. Another specimen from the same 

 source is in the collection of the A.N.S.P. 



The elongate-conic outline and strong basal spiral cords will readily 

 distinguish this species from Chrysallida tuomeyi (p. yy). 



I take pleasure in naming this species for F. S. Holmes, who, with 

 Mr. Tuomey, produced the monumental work on Carolina pale- 

 ontology. 



Genus MIRALDA A. Adams 



1863. Miralda A. Adams, Journ. Linn. Soc. London, vol. 7, p. 3. 

 1873. Lia Folin, Les fonds de la mer, vol. 2, p. 171 (type: Lia decorata Folin). 

 1904. Ividia Dall and Bartsch, Proc. Biol. Soc. Washington, vol. 17, p. 11 

 (type: Parthenia armata Carpenter). 



Shells with very strong spiral keels between the sutures and on the 

 base; the anterior one of which, and sometimes the one next to it, 

 is strongly crenulate; the remainder simple and acute. Base axially 

 Urate. 



Type : Parthenia diadema A. Adams. 



MiRALDELLA, new subgcnus 



Shell very minute, with strong axial ribs extending from the sum- 

 mit to a deep peripheral sulcus and beyond this as slender threads 

 over the base. Spiral sculpture confined to a very strong subperipheral 

 nodulose cord. 



Type : Miralda (Miraldella) gordonae, new species. 



MIRALDA (MIRALDELLA) GORDONAE, new species 



Plate 16, figure 3 



Shell very minute, pupoid, cream-yellow. Nuclear whorls small, 

 obliquely about half immersed in the first postnuclear turn. The post- 

 nuclear whorls are slightly rounded and marked by very strong axial 

 ribs, which are slightly thickened at the summit and at their strong 

 termination above the peripheral sulcus. Of these ribs 12 are present 



