CONTENTS. 



Preface 



Introduction I 



ADULT COLONY. 



External Characters 7 



Column wall 8 



Tentacles 9 



Disc and mouth 14 



Color 15 



Reproduction 16 



External characters on decalcification 18 



Anatomy and Histology 21 



Column wall and disc 21 



Tentacles 23 



Stomodieum 23 



Mesenteries 24 



Mesenterial filaments 29 



Skeletotrophic tissues 30 



Septal invaginationg, interseptal loculi, 



and gastro-coelomic cavity 34 



Gonads 37 



Corallum 38 



Histology 40 



Wall or theca 45 



Septa 46 



Synapticula 52 



Columella 53 



Dissepiments 55 



Epitheca and basal plate 56 



POSTLARVAL DKTELOFMBNT. 



57 



Young polyp ............ .............. . .................... 61 



Tentacles ................................................... 65 



First cycle of exotentacles ........................ 65 



First cycle of entotentacles ..................... 66 



Secondary exotentacles ............................ 69 



Second cycle of entotentacles and third 



cycle of exotentacles ............................. 71 



Third cycle of entotentacles and fourth 



cycle of exotentacles ............................. 73 



Mesenteries .................................................. 76 



First cycle of mesenteries (protocnemes) ... 76 



Second cycle of mesenteries (metacnemes) 79 



Third cycle of mesenteries ....................... 83 



Corallum ..................................................... 86 



First cycle of entosepta and second cycle 



of exosepta ............................. ........... 86 



Second cycle of entosepta and third cycle 



of exosepta ......................................... 93 



Third cycle of entosepta and fourth cycle 



of exosepta .......................................... 99 



Basal plate ........................................... 112 



Epitheca .............................................. 115 



Columella .............................................. 117 



Anatomy and histology of larva and young 



p'yp ............................................. : .......... 9 



Young polyps ................................... ........... 122 



References .................................................. 125 



Explanation of plates .................................. 126 



iii 



