CANADIAN FOSSILS. 47 



have the greater satisfaction in the above view of the affinity, 

 because, on explaining the specimens to Dr. Carpenter, I found that 

 he entirely agreed in it. After pointing out several objections that 

 might be made, he shewed me that there was in nearly every point 

 a close coincidence in essential structure between Receptaculites 

 and Orbitolites, the difference being only in the giant size of the 

 cells in this the most ancient of Foraminifera. 



Locality. — Plentiful in the limestone of Pauquette's rapids. The 

 Corals and Crinoidea which accompany it are : Petraia (2 species), 

 Favosites lycopodites (?) or ly coper don, with the Crinoid Schizocriniis 

 nodosus, and a species of Glyptocystites, the latter more rarely. 



R. AUSTRALIS, N. Sp. 



Plate X. Figure 8-10. 



Specific character. — R. magnus, expansus, cellulis verticalibus subcylindri- 

 cis incrassatis, apicibus subter convexis, lobulatis. 



Under this name a curious species of the genus is figured, for 

 the sake of comparison, from the Silurian limestones of New South 

 Wales. Communicated by the Rev. W. B. Clarke. 



It is remarkable as having the expanded apices of the columns on 

 the lower surface lobulated in larger or smaller divisions, which all 

 seem to radiate from a central boss. And this arrangement is quite 

 different from the merely granulated surface observable in the 

 R. occidentalis (figure 6). 



The upper surface too (figured as the lower in the plate, figure 8), 

 is curiously lobed beneath the surface. Figure 10 represents a 

 portion of two columns, broken off near the base, and viewed from 

 within. 



Locality. — Upper Silurian limestone of Yarradong, between the 

 Yass plains and the Murrumbidgee river, New South Wales, a 

 locality rich in Upper Silurian forms, Tentaculites, Favosites, 

 Pentamerus, Ormoceras, Trochonema, Rhynchonella, &c. 



J. W. SALTER. 



February 28th, 1859. 



