1846.] CATALOGUE DES ECHINODERMES. 269 



and most modest of all French palaeontologists of the 

 first half of the nineteenth century, was also still alive, 

 and with his printed list of fossil remains entitled, 

 "Tableau des corps organises fossiles," etc., in his 

 hands, he pointed out each of the echinoderms to 

 Agassiz. Besides those two collections, so important 

 on account of the types they contained, Agassiz studied, 

 one after another, the fine collections of Alcide d'Or- 

 bigny, Deshayes, Michelin, Graves, de Verneuil, d'Ar- 



r 



chiac, as well as the public collections of the Ecole des 



/ 



Mines, la Sorbonne, and the Ecole Normale. It was a 

 rare enjoyment for Agassiz. 



He himself wrote, without any aid from his secre- 

 tary, the " Resume d'un travail d'ensemble sur 1'orga- 

 nisation, la classification et le developpement progressif 

 des Echinodermes dans la Serie des terrains " ; a mas- 

 terly review of his knowledge of the Echinidae, and 

 read it before the Academy of Science of the Institute, 

 of which he had been a corresponding member since 

 April, 1839. Printed first in the " Comptes-rendus de 

 1' Academic," Vol. XXIII., it was reprinted with very few 

 alterations and addition in the " Annales des Sciences 

 naturelles," as an introduction to the " Catalogue rai- 

 sonne des families, des genres et des especes de la 

 classe des echinodermes, par MM. L. Agassiz et E. 

 Desor." The secretary and assistant of a savant has 

 no scientific right to authorship in the publications 

 made by the savant, though generally the savant says 

 in the introduction, or in the body of the work, that he 

 has been helped by his assistant. Agassiz refers several 

 times in the introduction of the " Catalogue raisonne 



