345 



0. anellus, Conrad, and 0. laqueatum, Hall, to Hyatt's genus Spyroceras. 



Page 214. 



For " Teipterockras semiplanatum, Whiteaves (Sp.)" read : — 



JoVELLANIA SEMIPLANATA, WhiteaVBS. 



The reference of Orthoceras semiplanatu^n to Hyatt's genus Tripteroceras 

 has not proved satisfactory, as the siphuncle of the former is known to be 

 cylindrical, while that of the latter is said to be nummuloidal. For the 

 present 0. semiplanatum may be provisionally referred to Jovellania, as 

 redefined by Foord, who says that its siphuncle is "generally nummuloidal" 

 rarely cylindrical. 



Page 236. 



For " Cheirurus pleueexanthemus, Green," read : 



Ceraueus pleueexanthemus, Green. 



