EXTINCT SPECIES. 121 



16. PALJSOTRINGA LITTORALIS MARSH. 



17. PAL^OTRINGA VETUS MARSH. 



18. PAL-ffiOTRINGA VAGANS MARSH. 



19. STJLA LOXOSTYLA COPE. 



20. GRACULUS IDAHENSIS MARSH. 



21. GRACULAVUS VELOX MARSH. 



22. GRACULAVUS PUMILUS MARSH. 



23. GBACULAVUS ANCEPS MARSH. 

 23bis.* GRACULAVUS AGILIS MARSH. 



24. ICHTHYORNIS DISPAR MARSH. 

 24bis.f APATORNIS CELER MARSH. 



25. PUPPINUS CONRADI MARSH. 



26. CATARRACTES ANTIQUUS MARSH. 



27. CATARRACTES APPINIS MARSH. 



28. HESPERORNIS REGALIS MARSH. 



29. LAORNIS EDVARDSIANUS MARSH. 



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



fNot In the Key. This species, with No. 24, represents a nevr order, Ichthyor- 

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

 p. 161, Feb., 1873.) 



