THE ANTHOZOA 



21 



locally, so that the proximal portions of the zooid cavities are sunk in a 

 coenenchyma. FAMILY 2. SYKINGOPORIDAE. Genus Syringopora, Gold- 

 fuss. This extinct genus resembles Clavularia viridis ; the cavities of the 

 zooids are divided by cup-shaped transverse partitions called tabulae (Fig. X. 

 7). FAMILY 3. TUBIPORIDAE. Genus Tubipora, Linnaeus. The zooids 



FIG. X. 



1. Diagram of the structure of a corallite of Tubipora purpurea, showing the tabulae in the 

 form of axial tubes, hp, horizontal platforms ; t, solenia. 



2. A similar diagram, showing complicated tabulae. 



3. View of the inner surface of a corallite of T. purpurea, showing the numerous lacunae, h 

 in the walls of the corallite, and in the region of the node the larger perforations, H, through 

 which solenia pass into the platforms. 



4. Diagram showing two tabulae broken across where one tabula (it) runs inside another 

 tabula (it). 



5. Diagram showing simple, flat, or cup-shaped tabulae. 



6. Portion of the edge of a growing tabula, showing how the corallum is formed by the 

 union of spicules. 



7. Portion of a colony of Syringopora ramulosa, showing the transverse connections between 

 the corallites which correspond to the solenia in the platforms of Tubipora; it, a tabula. 

 (After Hickson.) 



are elongate, ranged side by side, and spring from a calcareous encrusting 

 stolon. The proximal part of each zooid is stiffened to form a firm 

 calcareous calyx, the corallite, into which the distal part can be retracted. 

 The cavity of each corallite is divided by transverse, calcareous partitions 

 of various form tabulae. The individual zooids are united with one 



