302 PROCEEDINGS OF THE ACADEMY OF [Sept., 



consisting of eleven on the body whorl and about the same number 

 on the whorls of the spire; spiral lines on base of body very faint; 

 suture impressed; base of body nearly flat; angular edge between 

 base and sides of body well rounded; aperture ovate; margin of outer 

 lip broken away; inner lip strongly and smoothly excavated medially; 

 parietal wall washed with a thin glaze of callus; columella smooth. 



Dimensions (apex of individual broken away) . — Altitude 39.4 mm. ; 

 maximum diameter 11.1 mm. 



This species is well characterized by its long, slender, rather large 

 spire, and its flattened base, by its well defined axial costse but 

 obscure spirals. Whether the bend in the spire is an individual or 

 specific character of this many-whorled species cannot be determined 

 without additional material. Only one specimen is known at present 

 but it is of special significance since it is the first evidence of the 

 presence of this genus in the Upper Cretaceous. In Europe a number 

 of species of Hemiacirsa have been reported ranging in age from the 

 Montian^^ up to the recent species now living in the Gulf of Lyons. 

 One species only is known from the Eastern United States. This is 

 Hemiacirsa -peiiaqueata (Conrad) Cossmann,^'' a form originally 

 described as a Turritella by Conrad,'*^ later referred to the genus 

 Trachyrhynchus Morch by Martin^'-* and finally to the genus 

 Hemiacirsa by Cossmann in 1912. 



Family PYRAMIDELLID^. 



Genus CREONELLA n. gen. 



Etymology: A diminutive of Creon, king of Corinth. 



Type: Creonella triplicata n. sp. 



Shell small and smooth, in outline a simple, slender cone; whorls 

 closely appressed and increasing in size slowly; whorls of spire 

 generally flat and narrow ; protoconch very small and heterostrophous 

 with only two volutions; sculpture absent except for microscopic 

 incremental lines in the glaze of the external surface; suture sharply 

 impressed; body well rounded in front; aperture ovate; outer lip thin 

 and simple, inner surface of the outer wall of the l^ody strongly 

 Urate; inner lip excavated medially; columella marked by two plaits, 

 the posterior of which is the stronger; just behind the strong colu- 



« Cossmann, M., 1912, Ess. de Pal. Comp., livr. IX, pp. 97, 98. 



" Ibid.,, p. 97. 



48 Turritella perlaqueala Conrad, 1841, Proc. Acad. Nat. Sci. Phjla., Vol. I, 

 p. 32. 



"*" Trachyrhynchus pcrlaxjueatus Martin, 1904, Miocene Text, Md. Geol. Survey, 

 p. 239, PI. LVII, fig. 9. 



