100 THE CANADIAN NATURALIST. [Dec. 



globules similar to those described in the residue from the 

 Eozoon ophicalcite of Steinhag, with which, and with the 

 hornblendic limestone of Pargas, this coccolite-bearing limestone 

 of New York seems to be closely related. 



A fragment of ophicalcite from Tunaberg in Sweden bears a 

 striking resemblance to the coarser marked varieties of this rock 

 from near Passau. The carbonate of lime between the tubuli is 

 very sparry ; and after its removal, a perfectly coherent serpentine 

 skeleton is obtained, as in the Passau specimens. The surface of 

 the serpentine tubercles is abundantly covered with acicular 

 crystalline needles of various lengths, whose inorganic nature is 

 unmistakeable. The sediment from the acid solution also contains 

 a prodigious quantity of these same small crystalline needles. On 

 etching a specimen of this rock with dilute acid, the same needles 

 were found in most places ; but here and there, in isolated, less 

 crystalline and more solid portions of the carbonate of lime, there 

 were seen curved and ramified tubuli, undoubtedly corresponding 

 with the tubuli of Eozoon, and having the same size and manner 

 of grouping as in the Eozoon of Passau. The ophicalcite of 

 Tunaberg is therefore to be classed with the Eozoon-bearing 

 limestones. 



A specimen of crystalline limestone from Boden in Saxony, 

 holding rounded grains of chondrodite, hornblende and garnet, and 

 furnished me by Prof. Sandberger, showed, after etching, tubuli of 

 surprising beauty, both singly and in groups, but only in small 

 isolated compact portions of the carbonate of lime. The sparry 

 crystallization of this mineral seems to have frequently destroyed 

 the cohesion of the very delicate tubuli, the fragments of which 

 may be observed in very large quantity in the flaky residue from 

 the solution. 



A blackish serpentine limestone from Hodrisch in Hungary, 

 showed by etching no traces of tubuli. The granular residue from 

 its solution in acids showed under the microscope large quantities 

 of cell-like granules, with a central nucleus, and generally joined 

 in pairs, like the spores of certain lichens. More rarely however 

 three or four of such grains were joined together. By far the 

 greater part of them were of one and the same size, although 

 occasionally others of double size were met with. Their regularity 

 of form is much in favor of their origin from organic structure. 



A fragment of ophicalcite from Reichenbach in Silesia, which 

 Prof. Beyrich kindly furnished me, showed distinct parallel bands 



