Catalogue of Fossil Cephalopoda. 



283 



Ammonoidea into two groups, viz. : Group A, to include the Clj'menias 

 and Goniatites with more or less simple sutures; Group B, to 

 include the Ammonites with highly complex sutures. 



Fig. 3. — Pericyehis Doohylcitsis . a, lateral view; h, peripheral view; c, suture- 

 line, (nat. size.) Carboniferous Limestone : Doohyle, near Eatlikeale, co. Limerick, 

 Ireland. (Fig. 72, p. 151, op. cit.) 



^ The present volume is entirely occupied with Group A, Ammon- 

 oidea with more or less simple suture-lines, commencing with the 

 family Clymenidse, and the one genus Clymenia and eight species ; 



Fig. 4. — Glyjihioceran Hispanicum, Foord and Crick. Carboniferous : Asturias, 

 Spain, (nat. size.) a, lateral view ; 5, peripheral view ; c, suture -line. (Fig. 91, 

 p. 190, op. cit.) 



