12 PROCEEDINGS OF THE ACADEMY OF [1887. 



DESCEIPTION OF PRIMORDIAL FOSSILS FROM MOUNT STEPHENS, 

 N. W. TERRITORY OF CANADA. 



BY DR. C. ROMINGER. 



My friend, Mr. Otto Klotz, in charge of the Astronomical 

 work of the Canada Dominion, while engaged with geodetic 

 measurements accidentally discovered this very interesting 

 locality, Avhich furnishes an abundance of well-preserved primor- 

 dial fossils, particvdarly Tx'ilobites, imbedded wathin a dark gray 

 slate rock, of about 300 or 400 feet in thickness. Above the slate 

 succeeds a large series of dolomitic rock beds, and below a very 

 large belt of quartzites crops out ; although the immediate contact 

 of the quartzite with the slate is not seen in the locality. The 

 specimens collected on this s]3ot Mr. Klotz had the kindness to 

 send to me. He gave others to the University of Michigan, his 

 Alma Mater. Many of these fossils are remarkably well pre- 

 served, and nearly all of them are believed to be undescribed 

 forms. 



I have also to acknowledge here the liberality of Prof. A. 

 Winchell, who allowed me the use of the specimens sent to the 

 University. Among the collected fossils the most frequent form 

 is an Of/ygia, which, in honor of its discoverer, I propose to name 



Ogygia Klotzi. Pi. I, fig. i. 



More than a dozen perfect specimens of it are on hand, the 

 largest one of which measures 11 centimetres in length, by a 

 width of 6 centimetres ; others are smaller in all gradations down 

 to a length of only 16 millimetres. One specimen, which is other- 

 wi.se not perfect, has the head complete, with attached movable 

 cheeks ; in all the others the movable cheeks are missing. 



The flat expanded specimens have suffered a degree of com- 

 pression, as usually occurs with fossils preserved in a slate rock. 

 In a general way the longitudinal diameters of the head, the 

 thorax, and the pygidium are equal, but the latter is usually 

 somewhat longer than either of the other body-divisions. The 

 glabella is large, reaching almost the front margin, which projects 

 as an elevated narrow ]-im. 



The convexity of the glabella is only moderate, and the lateral 

 furrows on it, three in number, are very shallow, often scarcely 

 perceptible. Its sides are almost parallel, only slightly bulging 



