118 ON THE FOSSIL CORALS OF THE 



Locality and formation. — Devonian ; Corniferous limestone, near 

 Woodstock, Canada West. 



Syringopora laxata. — (Billings.) 

 This species occurs in large colonies whieli appear to be founded 

 upon a common base, but witb no lateral processes between tbe 

 corallites; these latter are usually two lines or a little more in 

 diameter, the distance between them being from three to eight lines. 

 Individuals are occasionally found single or separated from the parent 

 group. 



Locality and formation. — Near Woodstock. Corniferous. 



• Steingopoba nobilis.— (Billings.) 

 This species is distinguished from all others of the genus by the 

 great size of the corallites, which sometimes attain the diameter of five 

 lines. In the young state the form is that of an Aulopora, but the 

 adult specimens have branches three or more inches iu length, with 

 an internal arrangement of infundibuliform diaphragms, which are so 

 blended together as to produce a structure somewhat similar to the 

 vesicular tissue of the genus CystipJiyllum. The external wall is 

 thick and rather strongly annulated. 



Locality and formation. — Lot 5, Concession 13, Walpole. Cor- 

 niferous. 



Genus Aulopgea. — (Groldfuss). 



Generic Characters. — Corallum fixed, creeping, increasing by 

 lateral gemmation ; corallites hollow, cylindrical, or trumpet-shaped, 

 the visceral cavity of the young communicating with that of the 

 parent ; radiating septa represented by minute spines or strise. 



rig. 20. Aiilopora cornuta. 

 AtJLOPOEA C0ENT7TA. — (Billings.) 

 In this species, the creeping stolons are about one line in diameter ^ 

 and the mouths of the cells two lines. The young are produced at 

 intervals of from one to six lines. 



