Mictiigaii ( icolofjical ami 

 Biological Survey. 



I'liblicalloii 21): Itiolo^y 4. 

 I'latf XXV. 



A. SHELLDHAKl-: LAKE. LOOKING SOITIIWIISI' 



B. X()iM'ii\vi;si sihii!!'; of 



SIILLL1)|{ \l\i; LAl\i;. I.odKlNO XOK' 

 (SIWIK IN 142). 



ii-:.\s-i' 



