Intercalary Cartilages of Chorus Frogs 
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Fig. 1. Diagrams of mid-sagittal sections of three types of intercalary cartilages 
(IC) from the digits of forelimbs of frogs in the family Hylidae: A. Hyla ander- 
soni, showing the type found in numerous arboreal hylids; B. Pseudacris nigrita, 
showing the cuboidal type found in terrestrial chorus frogs not known to bur- 
row; C. Pseudacris streckeri, showing the reduced or wafer-shaped type found in 
the forelimbs of forward-burrowing chorus frogs. 
