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PLATE LY. 
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Fics. 1-14. PsepHopus maenus, Agass., 6 : ‘ : : 439 
Fies. 1, 2, 3. A set of three teeth which probably occupied the ramus of one jaw. 
Figs. 1a, 2a, 3a. The same set of teeth, showing under-surface hollowed out for attachment 
to the jaw. 
Fic. 4. Three helodoid teeth of PsEpHoDUS MAGNUS in natural position relative to each other. 
Fic. 5. Under-surface of larger specimen similar to figure 3. 
Fic. 6. Two attached teeth showing crenulated edges. 
Fias. 7, 8, 12. Several teeth of PSEPHODUS MAGNUS. 
Fie. 9. Three teeth in natural relative position, attached. 
Fie. 10. Side view of tooth, probably from the upper jaw, highly convoluted with. crenu- 
lated edge. 
Fic. 11. Side view of small tooth. 
Fics. 13, 14. Two large posterior teeth, much worn by attrition. 
All from Mountain Limestone, Armagh, Hex coll. Enniskillen Collection. 
Fries. 15-18. Tomopus convexus, Agass., : 0 6 : ‘ 0 446 
Fic. 15 a. Transverse section of tooth represented by figure 15. 
Fics. 16, 17. Teeth probably occupying opposite rami of the jaw. 
Fic. 16 a. Side view of figure 16, showing its enrolled form. 
Mountain Limestone, Bristol, H coll. Fig. 16, Bristol Museum. Figs. 15 
and 17, Enniskillen Collection. 
Fic. 18. Tomopus convexus, Agass. 
Smaller elongated teeth. 
Fig. 18 a. Longitudinal section of same tooth. 
Mountain Limestone, Bristol, : : Lx coll. Bristol Museum, 
Fias. 19, 20, 21. Xysrropus auausrus, Agass., 0 : ; z 449 
Mountain Limestone, Armagh, : Ee coll. Enniskillen Collection. 
Fics. 22, 23. XysTRoDUS EGERTONI, Davis, 0 . ° ° 6 5 450 
Fic. 23 a. Lateral aspect of same specimen, figure 23. 
Mountain Limestone, Bristol, 0 Ex coll. Enniskillen Collection. 
Fic. 24. XysTRoDUS PULCHELLUS, Davis, i 3 : ; : 5 450 
Fic. 24a, The same magnified. 
Mt. Limestone, Wensleydale, Yorkshire, Ha coll. Reed Collection, York. 
