22 



THE ANTHOZOA 



another by horizontal, calcareous lamellae or platforms, springing from 

 the levels of the tabulae and penetrated by branching solenia. New 

 zooids are formed by budding from the solenia of the platforms. 

 FAMILY 4. FAVOSITIDAE. The colony is basaltiform, composed of 

 numerous polygonal zooid tubes closely packed together. Tabulae 

 present and the walls of adjacent zooid tubes communicate by solenia. 

 Genera Favosites, Lamarck ; Syringolites, Hinde ; Stenopora, King. 

 FAMILY 5. COLUMNARIIDAE. This family of extinct corals, comprising 



Fio. XI. 



1. Favosites gothlandica, a colony about one-half natural size from the Upper Silurian. 



'_'. A portion of the same colony magnified, showing the closely apppsed corallites and the 

 perforations, solenia, placed at regular intervals on their walls, alternating with one another. 



3. Portion of a longitudinal section of Favosites gothlandica, showing the tabulae, solenia, 

 and the minute lacunae in the walls of the corullites. Magnified. 



All the figures original. 



the genus Columnaria (Goldfuss), may provisionally be placed among the 

 Autothecalia. See Bourne (9). 



The fossil forms of the Autothecalia were at one time placed along 

 with the Helioporidae and some Madreporarian corals in a group Tabulata. 

 Hickson (42) has clearly demonstrated the relations of Tubipora to 

 Syringopora, Syringolites, and Bourne has shown that Favosites must be 

 ranked with these forms rather than with the Helioporidae. There is a 

 great resemblance between the extinct Syringopora and the living 

 Clavularia viridis, and Hickson may be held to have established that 

 Syringopora, Tubipora, and their allies have been derived from a Cornu- 



