406 CAMBRIAN AND SILURIAN IN NORTH AMERICA. [XV. 



in the southwestern part of this island, a large" trilobite, de- 

 scribed by him as Paradoxides Bennettii (Geol. Jour., XV. 

 554), which appears, according to Mr. Billings, to be identical 

 with P. Harlani. On the same occasion Salter described, 

 under the name of Conocephalites antiquatus, a trilobite from a 

 collection of American fossils sent by Dr. Feuchtwanger of 

 New York to the London Exhibition of 1851. This was said 

 to occur in a bowlder of brown sandstone from Georgia, and, as 

 I have been informed by Dr. Feuchtwanger, was found near 

 the town of Columbus in that State. 



The slates of St. John, New Brunswick, and its vicinity 

 have recently yielded an abundant fauna, examined by Pro- 

 fessor Hartt, who at once recognized its primordial character. 

 This conclusion was first announced, on the authority of Pro- 

 fessor Hartt, in a paper by Mr. G. F. Matthew, in May, 1865. 

 (Geol. Jour., XXI. 426.) The rocks of this region have afforded 

 two species of Paradoxides and fourteen of Conacoryphe, to- 

 gether with Agnostus and Microdiscus, all of which have been 

 described by Professor Hartt. It may here be noticed that, in 

 1862, Professor Bell found in the black shales of the Dart- 

 mouth valley, in Gaspe, a single specimen of a large trilobite, 

 which, according to Mr. Billings, closely resembles Paradoxides 

 Harlani, but from its imperfectly preserved condition cannot 

 certainly be identified with it. (Geol. Canada, page 882.) 



The geological examinations of Mr. Alexander Murray in 

 Newfoundland, since 1865, have shown that the southeastern 

 part of that island contains a great volume of Cambrian rocks, 

 estimated by him at about 6,000 feet in all. No traces of the 

 Upper Cambrian or second fauna have been detected among 

 these, but some portions contain the Paradoxides already men- 

 tioned, while others yield the fauna which Mr. Billings has 

 called Lower Potsdam. This name was first given in an ap- 

 pendix (prepared by Sir "William Logan) to Mr. Murray's report 

 on Newfoundland for 1865, published in 1866 (page 46 ; see 

 also Report of the Geol. Survey of Canada for 1866, page 236). 

 The Lower Potsdam was there assigned a place above the Par- 

 adoxides beds of the region, which were called the St. John 



