SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 144. NO. 3. PLATE 12 



1-5, PYGORHYNCHUS OBOVATUS (AGASSIZ); 6, PARAPYGUS 

 TOUCASANUS (D'ORBIGNY); 7, 8, PYGORHYNCHUS MINOR 

 (AGASSIZ); 9, 10, PYGORHYNCHUS CYCLINDRICUS (DESOR) 



(SEE EXPLANATION OF PLATES AT END OF TEXT.) 



