t .- 



HI 



ii 



212 



Canadian Jucoril of Science. 



iiiinie Ncifsina A;/assi'.i} It is of coiisideiahle size, the 

 lai'j^est si)e('inieiis nieiisiiriiiu,' 100 iiiiii. in lucadlli, but is 

 very lliin, beiiij^' only 2 iiiin. in thickness. TIk' i^eneral 

 form is fan-like or reniforni, with concentric lines or 

 bands, from the edj^es of which loose tubes or hollow 

 bundles of fibres ])roject into the water. These bands are 

 described as " chambers," which arc, however, crossed ly 

 inunnuerablc thick ])artitions dividing them into chiim- 

 berlets, and these partitions nre composed of ■<\ fine ' 

 corneous stroma or network, in which and on the surface 

 are contained the arenaceous <.;rains that <;ive consistency 

 to the whole. It is evident that such a strucluic, if 

 fossilized, would resemble a flattened ("ryptozoon in form, 

 ap]»carancc and structure, c.\cei)t in havinij; rounded 

 chaml)erlets instead of short tortuous canals, a diheience 

 not of essiMitial importiince. (Iocs mentions as ]>robid>ly 

 an allied form JiiliaucUa fotida, Schlumberj^er, from 

 shaUow water (five metres) on the AVest ("oast of xVfrica. 

 It wants the filamentous stroma and has the chamberlets 

 laru;er and more regular and the lateral tubes more 

 numerous. If tlu^se forms are rightly included in Foiiuui- 

 nifera, they would strengthen the same reference for 

 Cryptozoon and Arclacozoon. In any case they indicate 

 the i)ersistence u}) to the modern time of organisms 

 apparently of tlie same general structure. 



IV. (liiiVANELLA, Nicholson {Strcritochciuti, Seely). 



These ])eculiar fossils were first detected bv Nicholson 

 and Ktheridge in the Silurian of (iirvaii in Scotland ' and 

 were illustrated by Mr. Welhered. of ( 'heltenham, at the 

 meeting of the Ihitish Association in Liverpool last 

 autumn.'' A similar form discovered in the ('hazy of 

 Vermont by Prof. Seely, of Middlebury I'ollege, was 



1 Hill. Mms. Coiiip. Zoi.liiKV, Vol. XXm., .No. ,'., ISil'J. 



2 NIcliolsdii itiid l.vik'ker, I'liliroiilnlogy, 188!), lli^t (IcsciiliiMl in Mfiiniii (Hi (lirv.iii. 



1S7S. 



a N'ow Coltfswiilil Xiitiirallsts' (Mull, Vol. .\1I, I't. 1, l,S'j:.-il. 



i: 



