342 Recherches stir les Poissons Fossiles. 



The 9th genus, Lepidotus, Agass., contains fourteen spe- 

 cies, four of which are from the lias near Boll in Switzerland, 

 Seefeld and Wirtemberg on the continent, and Northampton 

 and other places in England ; two from Jurasic limestone ; 

 the remainder are from the Green Sand of Hastings and 

 Tilgate forest in England, and the Morea ; and Portland 

 rocks, and one from the Calcaire Grossier* of Paris. 



The I Oth genus, Pholidophorus, Agass., affords five spe- 

 cies, four of which are stated by M. Agassiz to be from the 

 lias of Lyme Regis, and three from that of Seefeld, and 

 the fifth from the Zechstein of Sohlenhosen, and the frag- 

 ment of a sixth species has been found in the lias of 

 Oberland. 



The 11th genus, Microps, Agass., consists of a single spe- 

 cies in the lias of Seefeld. 



The 12th genus, Notagogus, contains three species ; two 

 found at Naples, and one in the Zechstein of Sohlenhosen. 



The genera composing the Sauroids, or second family of 

 the Ganoids, like those we have just gone over, have nothing 

 corresponding with them in the present creation. Those 

 in which the superior lobe of the caudal vertebrae is elon- 

 gated, lived anterior to the Jurasic deposits, being found in 

 underlying, and those in which the caudal is uniform, existed 

 afterwards, being found in overlying, rocks. 



Of the 1st genus, Pygopterus, Agassiz, one species be- 

 longs to the coal formation, and is found at Saarbruck ; two 

 are found in the Zechstein of Mansfeld, Nendershausen, 

 Riegelsdorf, and Muse near Autun ; and a fourth in the mag- 

 nesian limestone of East Thickley. 



The 2d genus, Acrolepis, Agassiz, contains but a single 

 species from the magnesian limestone of East Thickley, and 



* The Calcaire Grossier is a tertiary formation " exhibiting the first 

 dawn of the existing state of the animal creation," with, as in the pre- 

 sent instance, some of the last traces of an earlier creation. It is placed 

 next above the plastic clay. — Ed. 



