PLATE III. 



Orthoceras Nolani, A. H. Foord. 



Figs. 1 a, 1 b, 1 c. A large specimen covered with the test, the figure divided 

 into three portions to avoid the necessity of reducing it. Id. Longitudinal sec- 

 tion of the same. 1 e. Longitudinal section of another individual. 1 /. Trans- 

 verse section of the same along the longer diameter, and showing the excentric 

 siphuncle. Claue. Dublin Museum of Science and Art. (Page 4.) 



