EXPLANATION OF PLATES. 



PLATE I. 



Reptiles, birds, and mammals, all of the natural size, excepting fig. 12. 



Fig. 1. Femur of an Iguana, posterior view; a, exterior; 6, proximal, and c, distal views. 



Fig. 2. Hunierus of a species of Procellaria, front view ; a, posterior ; 6, proximal, and c, distal 

 view. 



Fig. 3. Coracoid bone of a large bird, superior view ; a, interior view. 



Figs. 4-6. Long bones of a rodent. 



Fig. 4. Left Inimerus without distal extremity, external view ; a, proximal view. 



Fig 5. Distal portion of right humerus, anterior view ; a, posterior view. 



Fig. 6. Left femur, front view ; a, posterior view. 



Fig. 7. Proximal portion of a rib which accompanied the jaws of Amblyrhiza latidcns, posterior 

 view ; a, proximal end. 



Fig. 8. Proximal phalange of rudimental first digit of Amblyrhiza inundala, superior view; 

 a, inferior, b, proximal, and e, distal views of the same. 



Fig. 9. Unknown bone found with those of Amblyrhiza; a and b, extremital views. 



Fig. 10. Symphysis mandibuli of Amblyrhiza from above. 



Fig. 11. Maxillary, molar, and palatine bones of an Arliodaclyle, supporting the temporary 

 dentition, from the right side ; a, from below. 



Fig. 12. Shell chisel of human manufacture, three-fourths natural size, viewed on the external 

 surface of the shell ; a, edge view. 



PLATE II. 



Figs. 1-3. Amblyrhiza quadrant, natural size. 



Fig. 1. Portion of the left maudibular ramus from above ; a, the same, the external side ; b, the 

 inner side, the incisive alveolus broken open. 



Fig. 2. Ilight ramus, probably of the same animal, from above ; b, the inner side. 



Fig. 3. First superior molar from below; a, outer side; b, inner side. 



Figs. 4 and 5. Left and right mandibular rami of Amblyrhiza latidens, natural size ; lettering 

 as above. 



PLATE III. 



Mandibular and premaxillary bones of Amblyrhiza latidens or A. qnadrans, natural size. 



Fig. 1. Premaxillary bone with portions of both incisor teeth, right side; a, superior view. 



Fig. 2. Inferior view of premaxillary bone of another individual. 



Fig. 3. Right mandibular ramus and symphysis ; a, from above. 



Fig. 4. Symphyseal region with incisor teeth from below; a, from above. 



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