PLATE XII. 



Cyrtoceras (Meloceras) apicale, sp. nov. 



Fig. 1 a. Lateral view of a specimen, nearly perfect at the apical end, showing 

 part of the body-chamber and the obliquity of the sutures on the lateral areas. 

 1 b. Ventral view of the same specimen, showing the horizontally of the sutures 

 on this aspect of the shell ; the median line is also seen. 1 c. Transverse section 

 showing the position of the siphuncle. 2. Lateral aspect of another specimen, 

 perfect at the apex, but not preserved in such a way as to show any indication of 

 a cicatrix; from a to b is the base of the body-chamber. 3. Polished longitudinal 

 section of a portion of another specimen showing the siphuncle with its beaded 

 segments. 4 a, 4 b. Ventral and lateral views respectively of a young individual, 

 showing three of the beaded elements of the siphuncle. St. Doulagh's. Dublin 

 Museum of Science and Art. (Page 33.) 



