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. Columxariidae. This family of extinct corals, comprising 



2 



Fio. XI. 



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



•J. — A portion of the same colony ma^'nilied, showing the closely apposed eorallites and the 

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



3.— Portion of a longitudinal section of FavosiUs (lOthUiudica, showing tlie tabulae, solenia, 

 and the minute lacunae in the walls of the corallitfs. Magnitied. 



All the tigures 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 Madroporarian 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 virulis, and Ilickson may be held to have established that 

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



