62 LOUIS AGASSIZ. [CHAP. iv. 



Des Moulins contain many similar results, and their coin- 

 cidence of publication and of result, due to a mere 

 accident, is very honourable to both. Des Moulins pre- 

 sented more facts and observations on the living and 

 Tertiary echinoderms, while Agassiz brought forward 

 more new forms and new genera from the secondary 

 (Cretaceous and Jurassic) echinoderms, and also a 

 better bibliographical knowledge of the subject. 



The "Tableaux synonymiques des Echinides " of Des 

 Moulins, is another " Prodrome," corrected and finished, 

 according to Des Moulins himself, in April, 1837, more 

 than a year after the publication of Agassiz's " Pro- 

 drome." Des Moulins says that when, on the point of 

 finishing the manuscript of his " Tableaux synony- 

 miques," he received from Agassiz a copy of his " Pro- 

 drome," and that he was thus enabled to interpolate all 

 Agassiz's synonymy, including also the names of species 

 described in works by several writers which Des Mou- 

 lins did not possess and had never seen. The question 

 of priority was settled by Des Moulins, in favour of 

 Agassiz ; Des Moulins's claims to priority being lim- 

 ited to two genera : Colly rites instead of Disaster of 

 Agassiz, and EcJiinocidaris instead of Arbacia of Gray ; 

 a detail simply in Agassiz's classification of the great 

 family of Echinoderms. 



The winter of 1834-1835 and all the spring of 1835 

 were devoted to his great work on fossil fishes, the echi- 

 noderm studies being considered by Agassiz as a sort of 

 relaxation and recreation. New numbers of the " Pois- 

 sons fossiles ' were issued, the text not corresponding 



