PLATE XXIX. 



ACANTHONAUTILUS BISPINOSUS, A. H. Foovd. 



Fig. 1. Lateral view of the same individual as that figured on PI. XXVIII, 

 showing the umbilical cavity with its thick rim and the broken stump of the 

 spine. (Page 118.) 



PhACOOKRAS ? BKCTIRCTTUUAI.E, sp. IIOV. 



Fig. 2a. Lateral view (cast) of the only individual known, showing the 

 renuirkably straight sutures and part of the body-chamber. 2\h. Peripheral 

 view. 2 c. Front view, showing the angular border and steep walls of the 

 umbilicus Couiity of Kildare (?). Public Museum, Belfast. (Page 111.) 



