No. 4.] HUNT — ON CAMBRIAN AND SILURIAN. 433 



Kichard Harlan, the cast of a large trilobite occurring in a silicious 

 slate, which was in the collection of Francis Alger, of Boston, 

 and, it was supposed, might have come from Trenton Falls, New 

 York. Dr. Green, who at once pointed out the fact that the 

 rock was wholly unlike any found at this locality, declared the 

 fossil to resemble greatly the Paradoxides Tessini, Brongn., — the 

 former Entomolithus jmradoxus of Linnaeus, from Westrogothia, 

 — and named the species P. Harlani. [Amer. Jour., Sci, I, xxv^ 

 336], In 1856, the attention of Prof. William B. Rogers was 

 called to a locality of organic remains in Braiutree, on the border 

 of Quincy, Massachusetts, where, on examination, he at once 

 recognized the Paradoxides Harlani in a silicious slate similar 

 to that of the original specimen. This was announced by him 

 in a communication to the American Academy of Sciences [Proc, 

 vol. iii], as a proof of the protozoic age of some of the rocks of 

 eastern Massachusetts. Prof. Rogers then called attention to 

 the fact that this genus of trilobites is characteristic of the pri- 

 mordial fauna, and noticed that Barrande had already remarked 

 that, from the casts of P. Harlani, in the London School of Mines, 

 and the British Museum (which had been made from the original 

 specimen, and distributed by Dr. Green), this species appeared to 

 be identical with P. spinosus from Skrey in Bohemia. 



In 1858, Salter found in specimens sent to the Bristol Insti- 

 tution, in England, by Mr. Bennett, of Newfoundland, from the 

 promontory between St. Mary's and Placentia Bays, in the south- 

 western part of the island, a large trilobite, described by him as 

 Paradoxides Bennettil [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 Conoce- 

 phalites antlqiiatuSj 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 boulder of 

 brown sandstone from Georgia, and, as I have been informed by 

 Dr. F., 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 Prof. Hartt, 

 who at once recognized its primordial character. This conclu- 

 sion was first announced, on the authority of Prof. Hartt, in apaper 

 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 Conocoryphe, together with Agnosias and Mlcro- 

 VoL. VI. V No. 4. 



