Geology and Natural History. 487 
The rhombic angle of witherite (native baric carbonate) is 118° 
30’, and the all but universal hexagonal macling of this species is a 
II. GeoLtoay anpD NaturaAL History. 
1. Hozoon Canadense not a Foraminifer vr Calcarcous Rhizopod 
secretion.—Mr. H. J. Carrer concludes a 1e Lozoon 
Canadense, in the Annals and Magazine of Natural History, for 
March, as follows: 
Nothing can be clearer than all that I have above stated of for- 
aminiferous structure, as seen under an inch-focus compound 
Power, in my infiltrated specimens of Nummuilites, Orbitoides, 
&e., from the Eocene formation of western India. 
Of Orbitoid dispansa, accompartied by the transverse bars of 
Stoloniferous structure uniting on chamber to the : Tn 
? do we for the casts of true foraminiferous 
oon 
structure, except by the wildest conjecture; and then such identi- 
fication no longer becomes of any scientific value. ; 
ving examined the slice of Laurentian limestone which you 
have so courteously submitted to me, in thick and thin polishe 
* See figures, Dana’s System of Min., p. 697. 
