I 



*;i 



208 



Camulian Jievon/ of Science. 



" III layers of liuit'stdiio still lower in the section an 

 obseure Hfrotiinfofxrruid form occurs in iiltmidiince, aloiiu; 

 with Ira^ineiits of a 'i'rilohite and a Salterella." Small 

 specimens of these slromaloporoiil forms were kindly 

 su])])lied to me hy Dr. W'alcott, and on bein^ sliced, 

 thoujL,di most of them were im)»erfectly ]>reserved. ont,' <»f 

 them exhibited the concentric lamina' of Cryptozoon, and 

 the intermediate layers composed of nncroscoj)ic grains 

 which were ascertained by Dr. Adams to be ])artly sili- 

 cious and partly calcareous (Dolonute ami ciilcite). 

 Instead of the irregular curying canals of the typical 

 Cry ptozoon, where best jn-eserved they show ragged cells, 

 giying oil' on all sides numerous small tortuous and 

 branching canals (Fig. o), but this structure I regard as 

 ])ossibly corresponding to that of L'ryiitozoon, and I 

 would therefore yenture to name the s])ecies C. Occitlciitalc, 

 in hope of the discoyery of better specimens. 



II. AUCILKOZOON. 



Still oldei' specimens referable to the same gener.il type 

 have been found by Dr. (i. F. Matthew in the r[)per 

 Laurentian ((Irenyillc; Series) of Southern New ]>runswick. 

 Dr. Matthew having kindly presented a large slab of 

 these fossils to the Peter Redpath Museum, 1 haxc l>een 

 enabled to study them both niacroscopically and micro- 

 sco[)ically. As described by Matthew, with reference to 

 their mode of occurrence in situ, they consist of cylin<h'ical 

 or polygonal cohunns api)arently nniltijilying l»y budcUng, 

 and composed of lamina' and intermediate layers which 

 are convex u])wards and are in places se})arated by s[>accs 

 occui)ied with calcite.^ The lanunu' haye the same aspect 

 with those of Cryjjtozoon: but the intervening tliick 

 granular layers, which haye a very uniform appearance, 



1 III tlie ^sliil) iireseiite<l to the Peter He(l|>aUi Miiseiiiii the iiidiviihial iiiasscs aic 

 aiiiiareiitly imt i« sitn, hut more or less ))rokeii ami jiileil uii to^-etlier ; some of tliem 

 are six iiiclies in iliameter. Tlie himimv, of white calcite in several of tlie .specimens I 

 regard as inorganic; unil fiihng lacunae or cavities. 



i'i- 



