tentirtii. Two of these pairs 

 \vcrc so uniformly persistent 

 in their movements that I 

 noted tlie same careful])'. 



"In one case the attacking 

 lish would driA'e its unrcsist- 

 ing companion half uut of the 

 water on the lower har h\- 

 biting vigorously at the tail, 

 and then leaving it stranded 

 in the scorching sun would 

 return to the upper end of the 

 ])ool until the other fish, after 

 slowly wriggling its bodv 

 around, would re-enter the 

 podl, when the attack would 

 be renewed in ])reciselv the 

 same manner. This continued 

 during two hours' ohserva- 



I'll. .tu In- C, 



rd 



I'l'.AI.M.I-; OF WILI.OW I'T.VR.M ICAX ST-\XUIX(", KKECT, 



AXD WITH Till': ytn'si; staxdixi; ix 

 I -\ST I X cT I \i; I .M rr.vriox 



I'll tc b) C toioL ^liii 



FEilALK UF Sl-KUCK PAKTKUiCE 



467 



