DEVONIAN ROCKS OF CANADA WEST. 119 



It closely resembles the figures of A. tulceformis, given by 

 Goldfuss, but is always much larger. 



Locality and formation. — Lot 6, con. 1, Wainfleet. Corniferous. 

 AuLOPORA FiLiFORMis. — -(Billings.) 



This species occurs in somewhat confused groups, or encrusting 

 reticulating masses, composed of tubes about one third of a line in 

 diameter, and branching at intervals which vary in length, from less 

 than one to three or four lines. 



Locality and formation. — Occurs at Eama's farm, near Port Col- 

 borne. Corniferous. I have seen only one specimen. 



Fig. 21. Aulopora vmbellifera, 

 AuLOPORA UMBELLIFERA. — (Billings). 



The mode of growth of this remarkable species is sufficient to 

 distinguish it at once from all other described forms of the genus. 

 The parent stems are about one line in diameter, and remain single 

 and straight for the distance of one fourth, or half an inch, when they 

 give off branches in all directions, sometimes ten or twelve at once. 

 These are at first oblique or somewhat parallel with the main tube^ 

 and are conneftted laterally ; they then radiate like the spokes of a 

 wheel, at right angles to the parent corallites, each soon giving birth 

 to a similar circlet of new tubes. 



It may be that this species should constitute a new genus ; but as 

 I have not been able to ascertain wherein its internal structure dif- 

 fers from Aulopora, I have disposed of it as above provisionally. 



Locality and formation. — Lot 6, con. 1, Wainfleet. Corniferous. 



Genus Zaphbentis. — (Eafinesque.) 



Generic characters. — Corallum simple, turbinate, elongated, free, 

 enveloped in a thin, solid epitheca ; radiating septa extending nearly 

 or quite to the centre ; transverse diaphragms well developed j a 



