U. S. NATIONAL MUSEUM 



BULLETIN 93 PL. 24 



M 



^^ 



la 



# 



V ' 



3a 



^^: 



lc 



lb 



5c 



1-2, Balanus eburneus; 3-3b, 5-5d, B. improvisus; 4, B. amphitrite peruvianus. 



For explanation of figures see page 343. 



I: 



5d 



