Phrag. 



638 



Phragmoceras eUipticum^ on page 637. 



Half ciTicLW^^, 



Fa/.Ohio.yo/JZ. 



Phragmoceras hector, Billions. Pal. l^oss. Vol i. 1862, 

 p. 163. For figure see S. A. Miller's N. A. Geol. & Pal. 1^89, 

 p. 453. Guelph. -formation. — Vi. 



Phragmoceras natator, Hall, {Bellerophon expansusf 

 V(i{ ,^ i. ..; .-^ .. .^«^ //. Hall, 1843. Not 



JB. expansus ^ 

 Sowerby,) 15th 

 Annual Report, 

 1862, p. 60, pL 

 6, figs. 12, aper- 

 ture ; 13, back ; 

 14, section lengthwise. '' The accidental breaking of the apex 

 of a specimen disclosed an extension of the lip on the ventral 

 side into the cavity of the shell, forming a septum as in the 

 typical forms of PJiragmoceras.'^'' Perhaps Sowerby's Bellero- 

 phon may turn out to be also a PJiragmoceras (Hall). Ham- 

 ilton coarser sJiales^ Chenango Co.. and Portage shale, Genesee 

 Co., N. Y.— F///^, /. 



