238 



BULLETIN OF THE 



EXPLANATION OF THE PLATES. 



PLATE L 



View of Nanomia cara (life size). 



Nanomia cara, A. Ag. 



c/. Stiff projections at the distal end 



of the embryonic tentacles. 

 1 cl. ) 



} First and second cleavage planes. 



Terminal filament of the adult 

 tentacular knob. 

 ht. Hydrocyst. 

 h ta. Tentacle of tlie hydrocyst. 



2 c/ 



n. 



tnv, Involucrura of adult knob. 



Ic. Lateral nematocyst of the em Dry - 



onic knob. 



07. Oil globule. 



ped. Peduncle of the tentacular knob. 



pi. Protoplasmic elevation. 



sac. Sacculus. 



Fig. 1. Egg with the primitive furrow almost formed, showing superficial proto- 

 plasmic envelope and protoplasmic network. 



Fig. 2. The same, a little younger. 



Fig. 3. Two-cell stage. 



Fig. 4. Four-cell stage. 



Fig. 5. Four-cell stage turned in another plane. 



Fig. 6. Beginnings of the furrows which form the eiglit-cell stage. 



Fig. 7. Hydrocyst of Nanomia found detached from the parent stem. 



Fig. 8. Embryonic tentacular knob. 



Fig. 9. Adult tentacular knob. 



