294 PROCEEDINGS OF THE ACADEMY OF [Sept.,. 



laterally expanded, equally strongly constricted anteriorly and 

 posteriorly, forming a broad shoulder behind and a decided con- 

 striction at the base of the body; aperture subcircular, produced in 

 front into a short, slightly curved canal with proximate parallel 

 margins, outer lip thickened a little along the margin, serrated by 

 the extremities of the four spiral ridges, shallow sulcus occurring on 

 the inner surface beneath each spiral ridge of the outer surface, two 

 low denticles developed between each pair of sulci along the inner 

 margin of the outer lip; inner lip broadly excavated at the base of 

 the body, sharply angulated at the entrance of the anterior canal; 

 umbilicus profound; umbilical keel prominent, slightty varicose and 

 flaring. 



Dimensions. — Altitude 11.4 mm.; maximum diameter 9.5 mm. 

 This species is well characterized by its low but acute spire, its 

 four strong spiral ridges and further by a slightly dentate inner 

 margin of the outer lip. It is represented in the Coon Creek collec- 

 tion by four or five specimens, the one selected for the type is perfectly 

 preserved and its generic relations can hardly be doubted. This 

 elegant little species is of special interest since it is the first repre- 

 sentative of this genus, so well known in the later Tertiary of the 

 Atlantic Coastal Plain to be found in the Upper Cretaceous. No 

 Eocene representatives are known from the Coastal Plain of the 

 United States so that the discovery of a typical Ecphora in the 

 Upper Cretaceous indicates that species of this well known genus 

 may be expected in the earliest Tertiary marine sediments of the 

 Southeastern United States. About a half-dozen species of Ecphora 

 are known from the Oligocene and the Miocene and are given in 190)3^ 

 in Cossmann's Essais de Paleoconchologie Comparee as follows: 

 Oligocene — 



Stenomphalus cancellatus Sandberg, France. 



Rapana tampaensis Dall, United States. 



Peristernia succinda T. Woods, Australia. 

 Miocene — 



Ecphora quadricostata Conrad, United States. 



Ecphora tricostata Martin, United States. 



Stenomphalus wiechmanni von Koenen, German3^ 



Rapana moulinsi Brochon, France. 



The protoconch of Ecphora proquadricostata is similar to that of 



E. quadricostata Conrad^^ the type of the genus, though different in 



28 Conrad, 1843, Proc. Acad. Nat. Sci. Phila., Vol. I, p. 310. See synonymy 

 n Martin, G. C, 1904, Maryland Geol. Survey, Miocene, p. 207. 



