56 



bulletin: museum of comparative zoology. 



o 



o 



En 

 CO 



o 



<^ 



— v^^ 



• • • • >• •• 



• • • ••|M*t**tl 



5 





•N 



05 





• • 





vO 



o o o 



o o o 





Go 



• ••6 o o o 



o o > 



0> 



M rn 



i/^ -o 



Diagram 1. (For explanation see opposite page.) 



