26 FISHES. 



threw a new light on the affinities of Fishes. The author who 

 had the good fortune of examining this fish, was enabled to 

 show that, on the one hand, it was a form most closely allied 

 to Zepidosiren ; on the other, that it could not be separated 

 from the Ganoid fishes, and therefore that also Zepidosiren 

 was a Ganoid : a relation pointed at already by Huxley in a 

 previous paper on " Devonian Fishes." This discovery led to 

 further considerations^ of the relative characters of Muller's 

 sub-classes, and to the system which is followed in the pre- 

 sent work. 



Having followed the development of the ichthyological 

 system down to the latest time, we have to retrace our steps 

 to enumerate the most important contributions to Ichthyology 

 which appeared contemporaneously with or subsequently to 

 the publication of Cuvier and Valencieimes's great work. As 

 in other branches of Zoology, activity increased almost with 

 every year ; and for convenience's sake we may arrange these 

 works in three rubrics. 



Eecent I. — VOYAGES, CONTAINING GENERAL ACCOUNTS OF ZOOLOGICAL 

 Works. 



Collections. 



A. French. 



1. " Voyage autour du monde sur les Corvettes de S. M. 

 rUranie et la Physicienne, sous le commandement de M. 

 Freycinet. Zoologie : Poissons par Quoy et Gaimard." (Paris, 

 1824, 4to, atlas fol.) 



2. " Voyage de la Coquille. Zoologie par Zesson." (Paris, 

 1826-30, 4to, atlas fol.) 



3. " Voyage de I'Astrolabe, sous le commandement de M. 

 J. Dumont d'Urville. Poissons par Quoy et Gaimard." (Paris, 

 1834, Bvo, atlas fol.) 



1 Description of Ceratodus. "Phil. Trans.," 1871, ii. 



