92 THE CANADIAN NATURALIST. [March 



The presence of such limbs might a priori have been expected ; 

 and the nature of the test suggested that Trilobites were walking 

 rather than swimming forms of Isopods. The branchiae had pro- 

 bably been under the telson ; and this would account for its large 

 development. It was not more surprising to find highly organized 

 Trilobites than it was to find such highly organized crustaceans 

 as Pterygotus, Eurypterus and SUmonia in the same beds. 



Prof Rupert Jones, Principal Dawson, and Sir Wm. Logan 

 made some remarks, more especially on Protichnites and Cli- 

 mactichnites, the latter having been explained as galleries of 

 Crustacea by Prof. Jones, when first exhibited in England. 



" Notes on the Geology of Arisaig, Nova Scotia." By the 

 Rev. D. Honeyman, D.C.L., F.G.S. 



The author referred to a previous paper on the Upper Silurian 

 Rocks of Nova Scotia, which he stated appeared to him now to be 

 generally repetitions of his Arisaig series. He noticed the occur- 

 rence of fossils in one of the beds previously supposed to be almost 

 destitute of organic remains, and described the occurrence, in 

 Arisaig township, of a band of crystalline rocks which appeared to 

 contain Eozoon and were probably of Laurentian age. A note 

 from Prof Rupert Jones, giving an account of the fossils 

 referred to by Dr. Honeyman, was also read. 



Discussion. 



Sir W. Logan said that Dr. Hunt had seen the specimens of 

 serpentinous limestone, and considered that they might be Lau- 

 rentian. Sections of them appeared to Dr. Dawson to show 

 tubulation rather difi'erent from that found in Laurentian Eozoon* 

 They might, therefore, belong to a difi'erent age. 



The following among other specimens were exhibited to the 

 Meeting : — 



Specimens of Sigillarioe, Calamites, etc. ; exhibited by Principal 

 Dawson. 



Specimens of Trilobites ; exhibited by E. Billings, Esq. 



