Fig. 81 shows the young Plenrobrachia swimming about in 

 the egg just before hatching, and in Fig. 82 (after A. Agassiz), 

 Fig. so. we see the young after batching 



■■■■■■■■^■H^BB (magnified) with nearly the same 

 ^Rj^^MjH^^H^^I form as the adult 5 / indicates the 

 iJra^HI^H funnel l eatnn g to tlje anal opening, 7, 

 ^■nRSj^Hnf^S^H the lateral tubes, and c c & & 

 ^^■m^^^lffl^^^H of locomotive flappers. The remain- 

 ^1 ing changes are slight, and there is 

 H not even a slight metamorphosis, the 

 body simply becoming spherical and 



Young pieurobrachia .till in the in ,en S th - In Bolina and its allies, 

 Egg. ' as A. Agassiz states, "the morpho- 



logical changes are very great, and it would indeed puzzle the 

 most accurate systematist to recognize in the early stages of some 

 of the Mnemidre the young of well known genera. We cannot 

 say that there is a metamorphosis in the ordinary sense of the 

 word, as supposed by Gegenbaur, but there certainly are remark- 



able changes, such as the almost total suppression of the tentacu- 

 lar apparatus, the development of auricles, of lobes, with their 

 complicated winding chymiferous tubes, which alter radically the 

 appearance of the Ctenophorne at successive periods of growth, 

 and present between the younger and the older stages differences 

 usually considered as of great systematic value." 



