THE 



GEOLOGICAL MAGAZINE. 



No. LXXV.— SEPTEMBER, 1870. 



OJEijXCSrXJSTJ^Hi J^iaTIOLIBS. 



p^.'b? 



\9P. 





I. — On a New Cephalaspis discovered in America, etc. 

 By E. Eay Lankester, B.A., Coiitts Geological Scholar, Oxford. 



PEINCIPAL Dawson, of Montreal, Canada, has placed in my 

 hands for description a remarkably interesting specimen, indi- 

 cating a species of the genus Cephalaspis in transatlantic Silurio- 

 Devonian beds. He writes, ''The specimen was found by one of 

 my assistants, Mr. G. F. Kennedy, B.A., when collecting with me, 

 in a bed charged with remains of Psilophyton, on the north side of 

 Gaspe Bay. The geological horizon is below the middle of the 

 Gaspe Sandstones, 

 but several hun- 

 dreds of feet above 

 their actual base, 

 so that the speci- 

 men may be re- 

 garded as either 

 Lower Devonian 

 or Lower Middle 

 Devonian. It oc- 

 curred in beds 

 containing Psilo- 

 phyton princeps and 

 P. rohustus, and 

 al so drift - trunks 

 of Prototaxites Lo- 

 gani, the latter in 

 the sandstones as- 

 sociated with the 

 coarse shaly bed 

 containing the 

 Cephalaspis. In 

 these sandstones 

 there are also 



spines 01 Machai- Fig. l. Cephalaspis Dawsoni, La.aki.{nskt.aize). 



racanfhus sulcatus Fig. 2. Part of surface magnified, 



of Newberry— a large fish characteristic of the Devonian of Ohio. 

 No marine remains were found in the bed holding the Cephalaspis, 



VOL. VII. — NO. LXXV. 26 



