ANTHOZOA—TABULATA. 91 



104. C. ordinatus (Billings). (Fig. 145.) Devonic. 



Tubes smaller and more distant and plates more widely sep- 

 arated than in preceding. Whole aspect more loosely aggregated. 



In the Onondaga beds of western New York and Canada. 



XXXIX. Thecia E. & H. 

 Generally massive corals composed of prismatic thick-walled 

 tubes with funnel-form calices. Base with a wrinkled peritheca, 



Septa 12, strong, uniting in ad- 

 joining calices across the in- 

 tervening space. Tabulae and 

 mural pores as in Favosites. 

 Sil.-Dev. 



105. T. major Rom. (Fig. 



146.) Siluric. 



Corallites 2 mm. in diameter; 



Thecia major (Ind. Geol. septa extend half way to center, 



their edges with two rows of 



granulose spinules. 



In the Niagara beds of Michigan, Tennessee, the Falls of the 



Ohio and other regions. 



106. T. minor Rom. (Fig. 147.) (T. Swinderana? (Goldf.).) 



Siluric. 

 Tubes about I mm. in diameter, otherwise similar to the pre- 

 ceding. Occurs with the preceding. 



107. T. ramosa Rom. Devonic. 

 Branching, cylindrical stems from half an inch to two inches in 



diameter. Calices unequal from 1 to 2 mm. in diameter. 



In the Onondaga beds of Michigan and the 

 Falls of the Ohio. 



XL. Alveolites Lamarck. 



tut t- FlG - I 47- Thecia 



Massive or arborescent coralla. Tubes thin- m i nor (enlarged). 

 walled, closely appressed, the calices oblique, 

 compressed, triangular or crescentic. Septa rudimentary. Tabulae 

 complete ; mural pores large but irregularly disposed. Sil.- 

 Dev. 

 108. A. niagarensis Rominger. Siluric. 



Hemispheric masses of concentric laminae, with epitheca on 



