PLATE XLIV. 
Fig. 1. CrenacaNtHus HETEROGYRUS, Agass. MSS., 
, la. and 1 b. Sections of the same. 
Limestone, Armagh, 3 : Ex coll, Enniskillen Collection. 
1as. 2, 3, CTENACANTHUS HETEROGYRUS, Agass. MSS.,_. : F i ‘ 
Mountain Limestone, Armagh, . Le coll. Enniskillen Collection. 
Fic. 4. CrENACANTHUS DENTICULATUS, M‘Coy,  . : : : : 0 
» 4a. Portion of surface enlarged. 
Shales of Monaduff, 5 Ex coll. Woodwardian Museum, Cambridge. 
Fic. 5. CreNACANTHUS LIMAFORMIS, Davis, 
» Da. Section across the same. 
Limestone, Bristol, ‘ : Ez coll. Enniskillen Collection. 
Fic. 6. CrENACANTHUS SALOPIENSIS, Davis, 
, 6a. and 6 6b, Sections across the spine. 
,, 6c. Portion of surface ornamentation enlarged. 
Limestone, Oreton in Salop, Bristol, Ez coll. Enniskillen Collection. 
Fic. 7. Crenacantuus pustus, Davis, ° ° 0 0 : 6 
Limestone, Armagh, . Lx coll. Enniskillen Collection. 
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