SEA-FISHERIES LABORATORY. 499 



Plate XIII. 



Fig. 83. Protozoea of Cancer pagurus, two hours after 

 hatching. View from the left side. x 120. 



Fig. 84. Telson of the same stage, from above, x 175. 



Fig. 85. Zoea of Cancer pagurus, thirty hours after 

 hatching, showing the maximum development 

 of the frontal and dorsal spines. x 90. 



Fig. 86. Dorsal view of the cephalothorax of the same 

 stage. The dorsal and frontal spines are cut 

 off short, x 110. 



Fig. 87. Telson of the same stage, from above. x 160. 



ii 





