73 



XORTH AMERICAN INDEX FOSSILS. 



Tabulate Corals. 

 XXX. Aulopora Goldfuss. 

 Compound corals attached for the greater part to shells, corals 

 or other foreign bodies and consisting of a number of simple cor- 

 nucopia-shaped to cylindrical tubes, each arising by budding from 



FlG. 121. Calceola tenneseenensis. 



Fig. 122. Aulopora sub tenuis enlarged 

 (Pal., N. Y.). 



below the calyx mouth of its parent, with which it remains united 

 by a persistent pore. Tabulae seem to be present in some species. 

 Septa represented by vertical ridges. Ord.-Carb. 



65. A. subtenuis Hall. (Fig. 122.) Devonic. 

 Slender curving tubes very gradually enlarging. Generally a 



single bud only. Length of tubes about 8 mm., diameter at aper- 

 ture 1 mm. 



Common in the Helderbergian of New York, etc. 



66. A. serpens Goldf. (Fig. 123.) Middle Devonic. 

 Attached by whole under surface; calices oblique upward, buds 



FlG. 123. Aulopora serpens on brachi- FlG. 124. Aulopora tubceformis on 

 opod shell. Spirifer. 



one or two, commonly reuniting so as to form meshwork. Com- 

 monly attached to brachiopods. 



In the Hamilton shales of New York, Ontario and Michigan. 



