PTEROPODA. Igo 



COLEOPRION, Sandberger (1847). 



In 1847 Dr. G. Sandberger established the genus Coleoprion, upon a fossil 



form found in the " Spirifer sandstones," near the base of the Devonian 



system in the Rhenish provinces, giving the following generic description : • 



" Shell tubuliform, appearing as an elongate cone, encircled by oblique 

 annulations, which are interrupted along a longitudinal line, and attenuate at 

 their extremities ; internal walls of the shell smooth." 



The typical form described by the author is C. gracilis (Leonhard and 

 Bronx, Jahrbuch I, p. 25, pi. 1, fig. 15). 



In 1852 the author reproduced his description of the genus and typical 

 species, comparing this new type, from the Spirifer sandstones, with the genus 

 Creskis, which he regards as its nearest analogue among the existing fauna 

 (Verslein. des Rheinischen Schichtensyslems in Nassau, p. 246, pi. 21, fig. 8). 



In 1857 Dr. Ferd. Rcemer quoted the observations of Dr. Sandberger on the 

 genus Coleoprion and the typical species C. gracilis, remarking upon the 

 resemblance between CoLEor-RioN and the recent genus Creseis (Lethea Geogn. 

 II, Lief. p. 439). 



In 1864 Prof. Ludwig defined the genus Coleoprion, describing a new species ; 

 C. brevis, from the upper part of the Devonian system in the Rhenish provinces 

 (Palaontographica, p. 322, pi. 50, fig. 23). 



In 1865 M. J. Barrande indicated the presence of Coleoprion in the Silurian 

 basin of Bohemia (Defense des Colonies, III, p. 41). 



In 1867 M. Barrande gave a resume of our knowledge of the genus, and 

 described two species, C. Sandbergeri and C. Bohemicum, from the Silurian basin 

 of Bohemia. 



In 1876 the writer referred to this genus a new species (C. tenuicinctum), from 

 the Hamilton group (middle Devonian), of the State of New York (Illustra- 

 tions of Devonian Fossils, pi. 27. A subsequent examination of this fossil with 

 a larger collection of specimens before me, has proved that it does not possess 

 the characteristic features of the genus Coleoprion, as will be shown in these 

 pages. 



The following form I refer with doubt to the genus Coleoprion. 



