FAVOSITID^. 



Sub-order, FAVOSITIN^. 



Compound polyparia, formed of intimately connected elongato- 

 conical tubes, diverging from an imaginary axis, and frequently 

 originating from a single mother-tube by prolific lateral gemma- 

 tion, constantly repeating. 



In some forms the tubes are in close connection in their whole 

 length ; in others the tubes become free at their ends. In contigu- 

 ity the tube channels are anastomosing by lateral pores. Trans- 

 verse diaphragms generally intersect the tube channels, but are 

 sometimes absent, either from being destroyed, or from non-devel- 

 opment, which latter is usually found to be the case in forms 

 with very stout thickened tube walls. The inner tube cavity is, in 

 the majority of Favositinae, radiated by a cycle of longitudinal 

 crests, or rows of spinules or squamiform horizontal leaflets pro- 

 jecting from the walls, which are separated by deep intervening 

 furrows. In other forms the crests are obsolete, the radial struc- 

 ture being indicated only by shallow longitudinal furrows, and in 

 others still the tube cavity is entirely destitute of crests or longi- 

 tudinal furrows. 



The following genera are representing this sub-order: i. Favosi- 

 tes ; 2. Alveolites ; 3. Limaria ; 4. Cladopora ; 5. Striatopora ; 

 6. Dendropora ; 7. Thecia ; 8. Vermipora ; 9. Qucnstedtia ; 10. 

 Michelinia. 



FAVOSITES. 



Massive or dendroid polyparia, with polygonal or circular orifices, 

 not or rarely projecting above the general surface, and opening 

 almost rectangularly to it. Tubes intersected by transverse dia- 



