No. 6.] J. W. DAWSON — SILURIAN FOSSILS. 335 



In the lower beds of iron ore, as represented at the Webster 

 and Blanchtird locations, the followino; fossils have been recoo;- 

 nized ; though in these beds the fossils are neither so abundant 

 nor so well preserved as in the upper beds. Those marked with 

 an asterisk are found also at Arisaig. 



^ Stenopora (Chaetetes) (allied to S. fibrosa) . 



* Crinoid stems. 



^ Chonetes Novascofica, Hall. 



* (7. tenuistrlataj Hall. 



'^ Spirifer rugae-costa, Hall. 

 S. (a large species allied to S. arenosa.) 



* Stropliomena profunda. Hall. 



* S. rhomboidalis, Wilck. 



* Rhynchonella Saffordl, Hall. 



E. (large species with about 20 prominent undivided 



ribs, very characteristic of some parts of the iron ore.) 

 i?. allied to R. iiobiUs, Hall. 

 Pentamerus (allied to P. pseudo-galeatus). 

 Stricklandinia Billingsi, n. s. (see infra). 

 Rensselceria cequiradiata, Conrad. 



* Orthis festudinaria, Dalman. 

 Plafyceras, sp. 



Platyostoma depressa, Hall, or allied. 



* Orthoceras, annulated (allied to 0. ibex). 



* 0. pimctostriatum, Dawson. 



* Cornulites fiexuosus, Hall. 



* Calymene Blumenbacliil, Brong. 



* Homalonotus Dawsoni, Hall. 

 Homalonotv.s (finely banded pygidium ? n. s.) 



These fossils are not numerous, but they present the same 

 partly Clinton and partly Upper Helderberg facies seen in the 

 middle portion of the Arisaig series. 



At the Ross location, East River, at the Holmes location, west 

 side of Sutherland's River, and at the east side of Sutherland's 

 River, in outcrops believed to be those of the upper beds, the 

 following species occur : — 



^ Stenopora (allied to S. fibrosa). 

 Syringopora, sp. 

 Cladopora (slenderly branching species). 



* Crania Acadiensis, Hall. 



