116 Proceedings of the Royal Irish Academy. 



EXPLAIN^^ITION OF PLATE V. 



rigs. 1, 1a. Zaphrentis Phillipsii^ E. & H. : Kilkee ; x f . 2. Chonetes 

 laguessiana^ de Kon. : Kilkee. 3. Pterinopedenp apyraceus, Sow. sp. 

 4. Pseudamusium fihrillosum, Salt, sp.: Lisdoonvarna. ^'b. Posidonomya 

 memlranacea, M'Coy : tlie type specimen. *'6. Modiola megalola^ 

 M'Coy : Eoynes Island. 7. Myalina peralata, de Kon. : Eoynes 

 Island. 8. Posidoniella Icevis^ Brown sp. : Eoynes Island. 9. Po8i- 

 doniella minor, Brown sp. : Eoynes Island. 10. Parallelodon semioos- 

 tatus, M'Coy sp. : Kilkee; x 2. 11. JVuculana stilla, M'Coy sp. : 

 Kilkee ; x 2. 12. Cypricardella selysiana, de Kon. : Kilkee. 

 *13. Chcenocardiola Footii, Baily sp. : Eosscliffe. 14. Macrocheilina 

 reticulatum, Brown sp. : Foynes Island; x 2. 15. Macrocheilina 

 elegans, Brown sp. : Foynes Island ; x 2. 16. Macrocheilina Gihsoni, 

 Brown sp. : Foynes Island ; x 2. 17. Loxonema strigillatum, de Kon. : 

 Kilkee; x 3. IS. Ptychoniphalus interstrialis i?),!^]!!!!.: Kilkee; x 3. 

 19. Ptychomphalus pisum, de Kon. : Kilkee; x 3. 20,21. Orthoceras 

 Steinhaueri, Sow : Foynes Island. 22. Orthoceras Tconinchianwn, 

 d'Orb. : Foynes Island. 23. Orthoceras aciculare^ Brown : Foynes I. 

 24. Orthoceras acutum sp. nov. : Lisdoonvarna. 25. Orthoceras acutum ; 

 showing chambers : Lisdoonvarna. 



EXPLANATION OF PLATE VI. 



Figs. 1, 1a. CcdlonautHus quadratus, Flem. sp. : Foynes Island. 

 2, 3, 4, 5, 6. Glyphioceras reticulatum, Phill. : Foynes Island ; showing 

 stages of growth (fig. 2x4, fig. 3 x 2). 5, 6. Portions of same 

 shell. 6, showing the form of the aperture. 7. Glyphioceras Bavisi, 

 Foord and Crick : Foynes Island. 8. Glyphioceras spirale, Phill. : 

 Foynes Island. 9-12. Glyphioceras diadema (?), var. with large 

 umbilicus and coarse ribs : Lisdoonvarna. 13-15. Glyphioceras 

 diadema, Beyr. : Lisdoonvarna. 16. Glyphioceras divaricatum sp. nov. : 

 Foynes. 17. Dimorphoceras Gilhertsoni^ Phill. sp. : Lisdoonvarna. 



18. Dimorphoceras discrepans, Brown sp. : Lisdoonvarna ; x 2. 



19. Nomismoceras spirorlis, Phill. sp. : Foynes I. ; x 4. 20. Poly- 

 rhizodus sp. : Kilkee. 



N.B. — All specimens are in the writer's collection except those 

 marked of which fig. 5 is in the Griffith collection, acd figs. 6 

 and 13 are in the collection of the Geological Survey of Ireland. 



