MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



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Fig. 13 [in I. 

 Manicina areolaia. — Figs. 13. Series of diagrammatic figures illustrating the mesenterial sequence in larva- and larval polyps, a, b are taken 

 from H. V. Wilson' 1888 account of the development of this species ". Stage with two pairs of protoenemes, one pair of which is 

 united with the stomodaeum (</. Wilson's fig. 18) b, Stage with three pairs of protoenemes, two pairs united with the stomodseum (rf. 

 Wilson's tig. 27 I. r. Stage with four pairs of protoenemes ( r/. PI. xix, fig. 134). d, Edwardsiast&ge. The larva is now fixed and remains 

 at this stage fur a considerable time, during which the six entocoelic septa are developed, and also the two cycles of tentacles (cf 

 PI. xix. fig. 135). e, sta^e with six pairs of protoenemes, all united with the stomodseum, and the first cycle of metacnemes. 



