PLATE 19. 



Fig. 8. C. g'eniculata. A portion of a branch showing ocecial internode 

 containing five zocecia, the ooecium (oe.) being the third member of the 

 internode, instead of the second member as in Fig. 7. X 36. 



Fig. 9. Crisia edwardsiana (d'Orbigny) Busk. Habit sketch. X 1. 



Fig. 10. C. edwardsiana. A portion of a colony showing method of 

 branching and formation of ordinary and Official internodes. Ordinary 

 internodes consisting sometimes of a single zoceeium (roe.) sometimes of 

 a Bpine (sp.) originating as does a zoceeium in a basis rami (6a. r.). The 

 official internode consisting of three members the oeecium (oe.) being the 

 second. Separating the inflated portion of the ooecium from the slender 

 conical portion is the septum (sep.). X 36. 



Fig. 11. Crisia occidcntalis Tins!;. Habit sketch. X 1. 



Fig. 12. C. occidentalis. A portion of a colony showing branching, 

 especially of the ooecial internode. In this, the oeecium (oe.) is the fifth 

 member of the internode; the first branch (br. 1) arising in a basis rami 

 (ba. r.), not wedged in, but attached to the side of the third zoceeium; the 

 second branch (br. 2) arising on the side of the sixth zoceeium, the 

 zoceeium which pairs with the ooecium; the third branch (br. J) arising 

 on the ninth zoceeium just above the summit of the ovicelfe The distal 

 portion of the official internode carrying the zoarial growth upward. X 36. 



Fig. 13. Crisia operculata sp. nov. A portion of colony showing the 

 branching of the ooecial internode. Here the first branch (br. 1) arises in 

 a slender basis rami (ba. r.) attached to the third zoceeium; the second 

 branch (br. 2) arises on the sixth zoceeium which pairs with the ovicell, 

 the fifth member of the internode. The distal portion of the official inter- 

 node (oe. int.) continues the zoarial tuft upward in a line with the axis 

 of the ooecium. X 36. 



Fig. 14. C. operculata. The distal portion of the oeecium showing the 

 operculum (op.) and the ooeciopore (oep.) at higher magnification. 

 About X 80. 



Fig. 15. C. operculata. The same as Fig. 14. with a portion of the 

 front, or ventral wall of the ovicell broken away to show the formation of 

 the operculum (op.) as a continuation of the dorsal wall (</. «.). 

 About X 80. 



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