230 



Pecten lamellosus, Sow. Trigonia gibbosa, Sow. 



Cardium dissiniile, Sow. Natica elegans, Sow. 



Pema Suessi, Oppel. Buccinum naticoides, Sow. 



Trigonia incurva, Sow. Ammonites giganteus, Sow. 



ECHINODEEMATA. 



Cidaris Boloniensis, Wright. Echinobrissus Brodieii, Wright. 



Hemicidaris Davidsoni, Wright. t, Haimei, Wright. 



11 Purbeckensis, Forbes. Astropecten Loriolii, Wright. 



Acrosalenia Koenigii, Desml. Ophidiaster Davidsoni, Wright. 



Pentacrinus Bouchardi, Wright. 



My late friend, M. Botjchard-Chantebeaux, kindly sent me a 

 series of all these specimens from the Portlandien of Boulogne, 

 and which I have critically compared with those of the same 

 species found in the Portland formation of the island of Port- 

 land, and from beds of the same age at Brill, Bucks ; and 

 Tisbury, and Swindon, Wilts. 



In the department of the Pas-de-Calais, in the environs of 

 Boulogne-sur-Mer, the Kimmeridien and Portlandien stages 

 are well exposed in the coast section between Cap Gris-Nez 

 in the north, to Eguihen in the south. These terrains have 

 been the subject of important studies made by Professor Hebert, 

 M. S^MANN and others ; and lately an admirable monograph 

 has been published by my friend M. P. de Loriol and M. E. 

 Pellat, in the " Memoires de la Societe de Physique et 

 d'Histoire Naturelle, Geneve." * As this important work gives 

 a most accurate account of all the beds by M. Pellat, and 

 descriptions and figures of the fossils by M. de Loriol, it forms 

 an epoch in the natural history of the upper division of the 

 Jurassic rocks of Prance, and a most valuable guide to a more 

 detailed examination of their correlative formations in England. 

 Having been long acquainted with the fossils of the Portlandien 

 of Boulogne, from several communications of the same made to 

 me by my late friend M, BotrcHAKD-CHANTEREAtrx, I can fully 



* MonograpMe Paleontologique et Geologique de I'etage Portlandien des 

 environs de Boulogne-sur-Mer. Geneve : 1866. 



