ii INTRODUCTION. 



the Cretaceous Formations now nearly completed. Associated with the late 

 M. Triger, M. G. Cotteau has published with admirable plates his ' Bchinides du 

 Departement de la Sarthe,' a work which includes both Jurassic and Cretaceous 

 species. M. Gr. Cotteau has also published a series of papers in the ' Revue et 

 Magasin de Zoologie ' on " Echinides nouveaux ou peu connus," containing many 

 rare forms of Jurassic species, and several other important memoirs on 

 Echinoderms from other formations. 



In Switzerland my learned friend M. E. Desor pubhshed in 1858 his valuable 

 ' Synopsis des Echinides fossiles,' illustrated with an atlas of well-executed plates 

 (this work being a revised and enlarged edition of the ' Catalogue raisonne des 

 Echinides ' by Agassiz and Desor) ; and, in conjunction with my learned friend 

 M. P. De Loriol, he issued the large work entitled ' Echinologie Helvetique,' 

 containing accurate descriptions and excellent figures of all the species of 

 Echinoidea found in the Jurassic rocks of the Alps. 



M. P. De Loriol has followed up this important national work with a second 

 volume, comprising the " Echinides " of the Cretaceous period, to which I shall 

 refer in detail on a future occasion. 



In Germany Professor Quenstedt, of Tiibingen, has published figures and 

 descriptions of all the species of Echinoderms from the Jurassic rocks of his 

 country, some of which previously had been so beautifully figured in the 

 ' Petrefacta Germanise ' of Goldfuss. 



The Echinology of different Jurassic regions of Germany has had able 

 exponents. Thus, Dr. Gustav C. Laube has contributed a memoir on ' Die 

 Echinodermen des Braunen Jura von Balin " with beautiful plates ; Dr. "W. Dames 

 has given " Die Echiniden der nordwestdeutschen Jurabildungen ' with plates. 

 The latter is an important contribution to the Palseontology of this region, as 

 showing how closely allied the north-western Oolites of Germany are with those of 

 Enofland. 



'a' 



M. De Loriol has enriched the ' Description Guologique et Paleontologique des 

 Etages Jurassiques supcrieurs de la Haute-Marne ' by MM. E. Royer and H. 



