172 



ARTHROPODA 



Fig. 77. Stalked barnacles {Lepas anatifera). 

 (From Kellogg & Doane. Courtesy of Henry 

 Holt & Co.) 



Fig. 76. Caligiis mutabilisy dor- 

 sal view. F.P., frontal plates; 

 C.A., cephalic area; L.A., lateral 

 areas; T.A., thoracic area; F.S., 

 free thoracic segment;G. 3"., genital 

 segment; A., abdomen; E.S., egg 

 strings. (Courtesy of C. B. 

 Wilson.) 



Fig. 78. Sacculina, a crustacean parasite of 

 crabs, {a) Attached to a crab, with root-like 

 processes penetrating the crab's body; {b) re- 

 moved from the crab. (From Jordan and 

 Kellogg, Animal Life. Courtesy of D. Appleton 

 &Co.) 



