586 
PLATE LX. 
Fic. 1. Pretatopus GRANDIS, Davis, 5 ; 5 ; 3 : 
Posterior aspect of a large tooth, natural size. 
Carboniferous Limestone, Armagh, Hx coll. Enniskillen Collection. 
Fic. 2. Peranopus rEcurvus, Davis, ; : 6 : ; : 
Mountain Limestone, Bristol, . ; Ex coll. Enniskillen Collection. 
Frias. 3, 4. PrETALODUS INEQUILATERALIS, Davis, . : : : 9 
,, 93 Anterior view of an average-sized specimen. 
» 4. Posterior view of another example. 
Mt. Limestone, Wensleydale, Yorkshire, £x coll. Enniskillen Collection, 
Fic, 5, PETALODUS RECTUS, Agass., 5 : a : : 
Carboniferous Limestone, Lowick. 
Fic. 6. PETALOPSODUS TRIPARTITIS, Davis, 6 : : : 6 
» 6a. Transverse section of figure 6. 
Carb. Limestone, Wensleydale, Yorkshire, Lx coll. Wm. Horne, Esq. 
Figs. 7, 8. Pontyruizopus RADICANS, Agass., a ; 0 9 6 0 
, 1. Anterior surface of a large specimen. 
, 8. Posterior or concave surface of another specimen. 
Mountain Limestone, Armagh, : Hx coll. Enniskillen Collection. 
Figs. 9, 10. Potyruizopus coLet, Davis, . 3 3 - 3 5 ° 
, 9. Convex front surface of a large specimen. 
,, 10. Concave posterior surface of another specimen. 
Mountain Limestone, Armagh, 6 Ex coll. Enniskillen Collection. 
Figs. 11, 12, 13. Poryruizopus stnuosus, Davis, 0 5 : : 
11. Anterior face of a large example. 
12. A smaller example with lateral prolongations of the crown surface. 
,, 13. Small specimen, probably immature, with crown, small and imperfectly developed. 
Mountain Limestone, Armagh, : Hx coll. Enniskiilen Collection. 
Fic. 14. Potyruizopus aTreNuAtTUS, Davis, 0 0 : : : 
Anterior face of medium-sized example. 
Mountain Limestone, Armagh, : Lx coll. Enniskillen Collection. 
Fic. 15. Potyruizopus constrictus, Davis, 5 ; : . 5 4 
Mountain Limestone, Armagh, : He coll. Enniskillen Collection. 
Fig. 16. PoLyruizopus ELoNGATUS, Davis, 5 b : 5 ° 6 
Convex anterior surface. 
» 16a. Concave posterior surface. 
, 16 6. Longitudinal section of tooth. 
Mountain Limestone, Armagh, , £z coll. Enniskillen Collection. 
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