260 - Marsh's Monograph on the Odontornithes 
— 1—Ontline of skull and brain-cavity of Hesperornis regalis, Marsh; nee 
om ; three-fifths nat size. 
Figure 2.—-Outline of skull and sant of the Loon, (Colymbus torquatiss 
mse wee same view; natural s x ene 
= "e coreal tic lobes; ¢ 
bellum; ff 3 < cue emispheres ; op. optic 5 
