ILLUSTRATIONS 



PLATES 



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1. View of principal fossiliferous exposures of Dragon Paleocene in 



Dragon Canyon, Utah 4 



2. General view of Wagon Road Ridge and Ferron Canyon localities... 4 



3. View over newly discovered Paleocene locality, Dragon Canyon 8 



4-9. DinosuehuH neivensis, a new fossil crocodile from Colombia 58 



10-12. Species of Arachnis 70 



13-18. New hydroids, mostly from the Atlantic Ocean 89 



19-24. Early Ordovioian sponges 102 



25-28. Species of Aegla 520 



TEXT FIGURES 



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1. Geologic map of the Dragon Canyon area, Utah 5 



2. Lower molar portion, occlusal view, of Taeviolahis; occlusal views of 



Catopsalis utahensis, type 9 



3. Jaw fragment of PtUodus ferronensis, new species, type 10 



4. Left rannis of mandible of Aphronorus simpsvai Gazin, type 11 



5. Maxillary portion of pantolestid (a), genus and species undetermined-- 12 



6. Loft ramus of mandible of Dracontolestes nphantus, new genus and 



species, type 13 



7. Maxillary portion of mixodectid? (b), with one upper molar and part 



of another 15 



8. Maxillary portion of Conoryctella drayonensis Gazin, type IG 



9. Left ramus of mandible of Protogonodonf spiekeri Gazin, type 18 



10. Left ramus of mandible of Protogonodon Uaihcles, new species, type — 19 



11. Left maxillary portion of Protogonodon? sp 20 



12. Right ramus of mandible of Oxyclaenus pearcci, new species, type 21 



13. Upper molars of Tricenles elassus, new species 23 



14. Dentition of Dracoclaenus griphus Gazin 25 



15. Fragment of left ramus of mandible of Oxytomodon perissum, new 



genus and .species, type 27 



16. Dentition of Ellipsodon fthepherdi Gazin 29 



17. Portion of right ramus of mandible of Ellipsodon sternbergi Gazin, type. 30 



18. Right maxillaiy portion of Jepsenia mantiensis Gazin, type 33 



19. Left upper dentition and right lower dentition of Desmatoclaenus 



hermaeus, new genus and species, type 35 



20. Dentition of Desmatoclaenus paracreodus, new species 38 



21. Dentition of Ectoconus symholns, new species 40 



22. Dentition of Carsioptychus hamaxitus, new species 41 



23. Right upper dentition of Periptychus gilmorei Gazin, type 43 



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