EXTINCT SPECIES. WAAL 
16. PALMOTRINGA LITTORALIS Marsz. 
17. PALHOTRINGA VETUS Marsu. 
18. PALMOTRINGA VAGANS Marsu. 
19. SULA LOXOSTYLA Copx. 
20. GRACULUS IDAHENSIS Marsu. 
21. GRACULAVUS VELOX Marsu. 
22. GRACULAVUS PUMILUS Marsu. 
23. GRACULAVUS ANCEPS Marsu. 
23bis.* GRACULAVUS AGILIS Marsu. 
24. ICHTHYORNIS DISPAR Marsu. 
24bis.f APATORNIS CELER Marsz. 
25. PUFFINUS CONRADI Marsu. 
26. CATARRACTES ANTIQUUS Marsu. 
27. CATARRACTES AFFINIS user, 
28. HESPERORNIS REGALIS Mars. 
29. LAORNIS EDVARDSIANUS Marsu. 

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