ADULT COLONY. 13 



only somewhat larger ; the entotentacles are bifurcated, and the exotentacles 

 simple. In the genus Agaricia, also belonging to the Madreporaria Fungida, 

 the tentacles are all simple, but in their wide distance apart they resemble 

 those of Stderastrea. 



The fully expanded tentacles of most species of Fungia seem to be small 

 and club-shaped, but in F. crassitentaculata they are much larger than is 

 usual for the organs in corals generally. This is well shown in the figure 



Ilia 



lie 



He 



FIG. 2. Diagram showing the relationship of the septa to one another in the same 

 polyp as that of fig. i. 



of F. crassitentaculata in Saville-Kent's " Barrier Reef." In all Fungia the 

 organs are widely apart, and, as in Siderastrea and Agaricia, occupy nearly 

 the whole discal area. 



The wide separation of the tentacles in the genera mentioned usually 

 tends to obscure their hexameral cyclic plan. The two polyps of Siderastrea 

 represented on plate xv in Agassiz's " Florida Reefs " are evidence of this, 

 and also the remarks of Verrill, given in the foot-note on p. 10. Such is also 

 the case with Dana's figure of Fiingia lacerta, but Bourne found the tenta- 

 cles of F. clavata to be arranged in distinct cycles. The positions usually 

 assumed by the tentacles of Siderastrea enable one to understand how such 



