OP ARTS AND SCIENCES. 181 



addition to the evidence heretofore possessed regarding the position of 

 tlie shales containing the Trilobites, I have the testimony of Sir W. E. 

 Logan that the shales of this locality are in the upper part of the Hud- 

 son River group, or forming a part of a series of strata which he is 

 inclined to rank as a distinct group above the Hudson River proper. 

 It would be quite superfluous for me to add one word in support of 

 the opinion of the most able stratigraphical geologist of the American 

 continent." 



This little notice had the privilege of drawing the attention of 

 Joachim Barrande, " the inventor of the primordial fauna," as he was 

 happily styled by D'Omalius d'llalloy, and here follow, in the order 

 of their dates, the correspondence and publications brought about by 

 the intervention of Barrande.* 



" Paris, 28 Mai, 1860. 

 " MoN CHER Monsieur Marcou : — 



" .... Si vous voyez le Prof. W. B. Rogers, je vous prie de lui dire, 

 que je suis tres reconnaissant des trois belles photographies de Para- 

 doxides Harlani Green, qu'il a eu la bonte de m'envoyer. Elles ont 

 beaucoup interesse notre societe geologique a laquelle je les ai moutrees, 

 en constatant que cette espece est identique avec Parad. spinosus de 

 Boheme. C'est un fait tres important, et qui doit avoir d'heureux re- 

 sultats, pour etablir les relations d'age entre les formations les plus 

 anciennes des deux continents. 



" Par occasion, je desirerais beaucoup savoir par le Prof. Hitch- 

 cock, gcologue de Vermont ou par tout autre savant qui aurait etudie 

 le terrain : — 



" 1*. Quels sont les fossiles qui se trouvent dans les raSmes couches 

 qui ont fourni les trois trilobites recemment d'ecrits par J. Hall dans 

 le 1 2th Annual Report of the Regents of the University of New York, 

 p. 59, sous les noms de Olenus Thompsoni, 01. Vermontana, et Peltura 

 (Olenus) Holopyga. 



* Colonel E. Jewett, Curator of the State Cabinet of Natural History of New 

 York at Albany, " during the numerous excursions he had made over the dis- 

 puted territory, had arrived at the conchision, from his own observations, that 

 Dr. Emmons was, upon the whole, correct in his views," and Billings, " on the 

 25th of April, 1860, .... sent a copy of Prof. Hall's pamphlet, containing the 

 figures and descriptions (of the three Vermont Trilobites) to Barrande, then in 

 Paris," and said, " I referred him to these three trilobites, as an example of a 

 group of primordial fossils, in rocks which were considered by American geolo- 

 gists to be of the age of the Hudson River formation." — Remarks on the 

 Taconic Controversy, by E. Billings, in " The Canadian Naturalist," New Series, 

 vol. vi. pp. 315 and 317 (Montreal, 1872J. 



