ANTHOZOA. ZOANTHARIA 



91 



marked cardinal fossula is present. Septa moderately numerous, the 

 larger reaching very nearly or quite to the centre, the smaller usually 

 short. Tabulae well developed, extending quite across the visceral 

 chamber. No true dissepiments. Columella absent. Silurian to 

 Carboniferous. Ex. Z. delajiouez, Carboniferous Limestone. 



Amplexus. Similar to Zaphrentis, but generally cylindrical, 

 and with very short septa. Devonian and Carboniferous. Ex. A. 

 coralloides, Carboniferous. 



Caninia. Form similar to Zaphrejitis, but often cylindrical 

 and slender. The longer septa meet in the centre in the lower part 

 of the coral, but are usually short in the upper part. No columella. 

 Tabulae well developed. A peripheral ring of more or less vertical 

 dissepiments is present in the adult part. Carboniferous. Ex. C. 

 cormtcopice. 



A B 



ill 



m 



Fig. 35. Calceola sandalina, from the Middle Devonian ; A, showing 

 interior of calyx; B, inside of operculum of the same. Natural size. 



Streptelasma. Simple, conical or turbinate, bilateral, with 

 a thick wall. Septa numerous, alternately long and short. A 

 fossula usually present, but sometimes indistinct or wanting. 

 Columella large, false, trabeculate. Tabulae irregular, usually poorly 

 developed. Dissepiments moderately developed. Ordovician and 

 Silurian. Ex. S. comictdum, Ordovician. 



Cy stiphy Hum . Nearly always simple, conical. Septa and 

 tabulae absent or rudimentary ; visceral chamber filled with vesicular 

 tissue, the outer part consisting of dissepiments, the central part 

 representing tabulae. Fossula sometimes present. Columella absent. 

 Calyx often deep, commonly with ridges representing septa. Silurian 

 and Devonian. Ex. C. vesiculosum, Devonian. 



Calceola. (fig. 35.) Simple, conical or slipper-shaped, one side 

 is flat, the other convex ; calyx very deep and closed by a semilunar 



