SMITHSONIAN CONTRIBUTIONS TO KNOWLEDGE, VOL. xxxin. 



PLATE 3. 



FIG. i. 



FIG. 2. 



FIG. 3. 

 CRANIUM OF BALMNOPTERA PHYSALUS (L.). 



Figs. 1-3. Cape Cod, Mass., Ward's Natural Science F.stablishment, Rochester, N. Y. 



