1(3 Mr. Konig on the Rock Specimen-^ 



appears from his reference to a figure in the Amcenitates Acadc- 

 jnicay that he is speaking of Tubipora serpens., L., which is 

 not a congener of, and can indeed scarcely be considered as be 

 longing to the same natural order with Catenipora. We may, 

 therefore, look upon this arctic species as an undescribed and 

 anonymous one. I call it 



Catenipora Parrii: tubulis crassiusculis, compressis, col- 

 lectis in laminas sinuatas varie inter sese coalitas, tubulorum 

 orificiis ovatis ssepe confluentibus : dissepimentis confertissimis. 



The space between the laminae is filled up by a yellowish cal- 

 careous mass ; the tubes themselves are converted into carbonate 

 of lime, internally drused with minute crystals of the same 

 substance. 



Very little can be inferred from the specimens of primitive 

 rocks, gathered both in Prince Regent's Inlet and Barrow's 

 Strait : they are, for the most part, fragments from rolled pieces, 

 and consist chiefly of granite, mica slate, and quartz rock. 

 There are, nevertheless, some among them, especially among 

 those from the first-mentioned tract, which distinctly indicate 

 primitive trap formation, such as granular and slate hornblende 

 rock, together with several varieties of syenite, and similar 

 rocks, in which hornblende and felspar form the predominating 

 ingredients ; some of them enclosing massive and indistinctly 

 crystallized epidote of either a yellowish or grass-green colour. 

 Amono' some specimens found at Port Bowen, on the eastern 

 coast of Prince Regent's Inlet, may be specified a rolled piece 

 of a mass, composed of flesh-red felspar, greyish-white quartz, 

 and a substance which is distinct from epidote, though it might 

 easily be mistaken for it. According to an analysis, with which 

 I have been favoured by J. G. Children, Esq., it is composed of 

 silica 59.89, alumina 22.45, soda 6.84, lime 4.85, oxide of iron 

 4.0, magnesia 0.67, oxide of manganese 0.16 ; — loss 1.14. Its 

 specific gravity Mr. Children found to be 2.67. Before the 

 blow-pipe it melts into a milk-white enamel. Its colour is a 

 dirty yellowish green, passing into brownish. It is scratched 

 by the knife ; streak white. Fracture uneven, dull, approach- 

 ing to resinous ; here and there with small planes of cleavage. 



