PLATE 2 



EXPLANATION OF FIGURES 



2 Skeleton of a nestling hoatzin (Opisthocomus cristatus) ; two-thirds natural 

 size. Same lot as the one shown in figure 1, with same history. Skull and lead- 

 ing cervical vertebrae in right oblique lateral view. Skeleton of trunk twisted 

 over so as to give a ventral view of the thorax, pelvis, and skeleton of tail. Wings 

 rotated over with skeleton of trunk. Pelvic limbs separated from skeleton by 

 dividing bones of the leg at their middles, in order to present more instructive 

 views of them. 



3 Dorsal view of the trunk and pectoral limbs of a nestling hoatzin (Opis- 

 thocomus cristatus). Head viewed upon left oblique aspect, and the right pel- 

 vic limb seen upon its outer side. Same lot as the one shown in figure 1, with 

 the same history. Figui-es 1 to 3 alcoholic specimens; two-thirds natural size. 



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