552 
PLATE XLIII. 
Fic. 1, CrENACANTHUS TENUISTRIATUS, Agass., 
A large but imperfect specimen. 
» la. Section across the same. 
Limestone, Bristol, 
Fic. 2. CTENACANTHUS TENUISTRIATUS, A gass., 
», 2a. Section showing the posterior cavity. 
» 20. Section nearer apex, cavity enclosed. 
Limestone, Bristol, 
Fic. 3, CrENACANTHUS BREVIS, Agass., 0 
5, 2a Section near the base. 
Limestone, Armagh, 
Natural size. 
Page 
F ; 335 
He. coll. Rnniskillen Collection. 
Ex. coll. Bristol Museum. 
337 
Ex. coll. Enniskillen Collection. 
