Figs. 1-4. — Trinacromerum hentonianum Cragin. t, skull from below, one-sixth 

 natural size; 2, extremity of beak, one-half natural size; 3, pectoral girdle in pait 

 one-sixth natural size; 4, left hyoid from below. At, atlas; CI, clavicle, Co, coracoid; 

 Ic, interclavicle; Icf, interclavicular foramen; PI, palatine; Ps, parasphenoid; Pt, 

 pterygoid; Sc, scapula. 



