PLATE II. 



Orthoceras CoLEi, A. H. Foord. 



Fig. 1 «. Fragment sliowiug part of the bod3-cljamber and septate part of the 

 shell. 1 h. Longitudinal section of the same, showing the septa and siphuncle. 

 1 c. Transverse section of the same. Clane. Dublin Museum of Science and 

 Art. (Page 3.) 



Orthoceras acre, .1. H. Foord. 



Fig. 2 a. Specimen wanting a portion of the body-chamber, but perfect at the 

 apex. 2 h. The apical portion of 2 «, separated from it to avoid reduction of 

 the figure. 2 c. Apical extremity greatly enlarged. 2 d. Transverse section, 

 showing the siphuncle. Little Island. Dublin Museum of Science and Art. 

 (Page 6.) 



Orthoceras pekapproximatcjm, A. H. Foord. 



Fig. 3. Specimen showing the very numerous septa. Clane. Dublin Museum 

 of Science and Art. (Page 11.) 



