82 



NORTH AMERICAN INDEX FOSSILS. 



XXXIV. Syringopora Goldfuss. 

 Coral consisting of numerous irregular cylindrical tubes which 

 grow parallel but generally separated, and have at intervals trans- 

 verse hollow, tubular connecting processes. Interior filled with 

 funnel shaped tabulae. Young as in Aulopora. 

 Septa represented by spines. Sil.-Carb. 



75. S. verticillata Goldfuss. Siluric. 

 Tubes separated by from one to two or more 



times their diameter (2 to 3 mm.) connected at 

 distant intervals by transverse tubes of which 2 

 or 3 are given off at the same plane. 



Niagara group of Canada, Michigan, etc. 



76. S. retiformis Billings. (Fig. 131.) 

 Tubes a millimeter or somewhat less in diameter, irregularly 



bending or geniculate, joining where in contact but not by tubes. 

 In the Niagara beds of New York, Canada, Kentucky, etc. 



yy. S. tubiporoides Y. & S. Devonic. 



Tubes not parallel, about 3 mm. in diameter and separated by 

 greater distances. 



Onondaga limestone of Kentucky, etc. 



78. S. maclurei Billings. (Fig. 132.) Devonic. 



Tubes about 25 mm. in diameter, more regular than preceding, 

 but coming closer together at more or less regular intervals.. 



Fig. 131. Syringo- 

 pora retiformis (after 

 Lambe). 



Siluric. 



Fig. 132. Syringopora Fig. 133. Syringopora 

 maclurei. hisingeri. 



(After Billings.) 



Fig. 134. Syringopora 

 perelegans. 



In the Onondaga limestone of New York, Canada, Michigan, etc. 

 79. S. hisingeri Billings. (Fig. 133.) Devonic. 



Corallites are slender tubes of less than I mm. diameter, sepa- 

 rated by their own width or a little less or more. Frequent con- 

 necting tubes occur. 



