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NEW YORK STATE MUSEUM 



The septa are regularly concave and close together, the surface 

 ornamented by very fine elevated threadlike eccentric lines. The 

 species is not unlike the -C. subrectum Hall of the Helder- 

 bergian, whatever generic form that may prove to be when better 

 known. 



Lower Devonic. St Alban beds, Cape Rosier Cove, P. Q. 



Kionoceras rhysum nov. 



Straight longicones with regular narrow, erect annulations which 

 may be slightly oblique and are separated by broad, smooth, con- 



Kionoceras rhysum 



cave or flat interspaces. On the best preserved external casts 

 there is no trace of either longitudinal or concentric lines but the 

 summits of the annuli are dotted or punctured. 



This form is represented by specimens for the most part small, 

 in which there are on the average six annuli in a length of 20 mm 



