52 
GUIDE TO THE CORAL GALLERY. 
Case 4. 
smaller dactylopores, can be seen scattered over the surface of these 
corals. A section shows in the cavities of the calicles series of 
Fig. 13. 
Antennularia antenmna. A. Natural size. b. Joint of stem with branchlets magni- 
fied; a, polyp; b, nematophore ; ^reproductive capsule, c. Branchlet highly 
magnified (lettering as before). (After Allman.) 
parallel floors (tabulae) marking successive stages of growth activity. 
Millepora is richly provided with thread-cells, which retain their 
