174 THREE CRUISES OF THE “ BLAKE." 
however, it is easy to distinguish the different forms. The 
huge ctenophores float by, like luminous balls, among the 
myriad lesser lights caused by the smaller jelly-fish, while the 
Fig. 73. — Balanus Larva. Greatly 
magnified. 
Fig. 5. — Pagurus Larva. Fig. 70. — Peneus Embryo. 
Greatly magnified. Greatly magnified. 
Physalia resemble fire-balloons on the surface, and spread the 
phosphorescence in all directions. 
