92 NORTH AMERICAN INDEX FOSSILS. 



lower side. The large marginal pores cause a pouch-like dilation 

 of the tube-wall. 



In the Niagara group of Michigan and the falls of the Ohio. 



109. A. squamosus Billings. Devonic. 



Differs from the preceding in the greater horizontal expansion 

 (5-6 in.) as compared with the thickness (1 in.) also in the great 

 obliquity of the apertures, and in the absence of the pouch-like 

 protuberances. Septal spines present. Greatest diameter of tubes 

 .5 to I mm. 



In the Onondaga formation of New York, Canada, Michigan, 

 Ohio, Kentucky, etc. 



no. A. goldfussi Billings. Devonic. 



Flattened or disk-like expansions like the preceding with a basal 

 epitheca. Tubes larger (1.5 to 2 mm.), oblique and in various 

 stages of compressions in the same specimen. 



In the Hamilton group of New York, Canada, Michigan, Iowa 

 and in strata of similar age near Louisville, Ky. 



XLI. Cladopora. 



Coral composed of branching stems or flattened expansions, 

 with thick-walled elongate, conical tubes, opening oblique to the 

 surface, with dilated orifices. Mural pores and occasional tabulae 

 present. Sil.-Dev. 



Flattened Expanded Species. 

 in. C. laqueata Rominger. Siluric. 



Expansions composed of round or compressed elliptical stems 

 from two to four millimeters in diameter and uniting repeatedly so 

 as to form a coarse network. Orifices of tubes distant with a 

 strong lip, oval, transverse to the branches, width nearly a milli- 

 meter. 



In the Niagara group of Michigan and at the falls of the Ohio. 



112. C. lichenoides Rominger. Devonic. 



Irregular expansions with peritheca on the under side. Tubes 

 flattened, extending outward, prostrate but bending upward at the 

 ends. Orifices oblique or at times nearly at right angles to the 

 tube, and polygonal. 



In the Onondaga beds of New York, Canada, Michigan and the 

 Falls of the Ohio. 



