EXTINCT SPECIES. 121 



16. PAL^OTRINGA LITTORALIS Marsh. 



17. PAL^OTRINGA VETUS Marsh. 



18. PAL^OTRINGA VAGANS Marsh. 



19. SULA LOXOSTYLA Cope. 



20. GRACULUS IDAHENSIS Marsh. 



21. GRACULAVUS VELOX Marsh. 



22. GRACULAVUS PUMILUS Marsh. 



23. GRACULAVUS ANCEPS Marsh. 

 23bis.* GRACULAVUS AGILIS Marsh. 



24. ICHTHYORNIS DISPAR Marsh. 

 24bis.t APATORNIS CELER Marsh. 



25. PUFPINUS CONRADI Marsh. 



26. CATARRACTES ANTIQUUS Marsh. 



27. CATARRACTES AFPINIS Marsh. 



28. HESPERORWIS REGALIS Marsh. 



29. LAORNIS EDVARDSIANUS Marsh. 



*Not in the Key. (Marsh, Am. Jour., Sci. and Arts, t, p. 230, March, 1873.) 



jNot in the Key. This species, with No. 24, represents a new order, Ichthyor- 

 nithes, of a new subclass, Odontornithes. (Marsh, Am. Jour., Sci. and Arts, v, 

 p. 161, Feb., 1873.) 



