166 MESSES. A. J. JUKES-BEOWNE AND W. HILL I [May 1896, 



dermata, and all mollusca, except the cephalopoda, must be neglected 

 in the comparison, and with reference to geological age only the 

 cephalopoda should be admitted as evidence. 



2. Fossils from the Cenomanian of Normandy. 



The following list contains only the fossils obtained by our- 

 selves at the places named, together with a few others for which 

 we have the authority either of M. Lennier or M. Lecoeur, and a 

 few occurrences of particular echinodermata mentioned by Wright 

 or in d'Orbigny's volumes. 



A complete list of Cenomanian fossils, including those found in 

 the Sarthe, would be a very long one, and would not serve any 

 specially useful purpose. The present list may be taken to include 

 all the commoner fossils of the more calcareous facies of the Ceno- 

 manian in North-western France, such species as would generally 

 be met with by any collector. A full list of the fossils found in 

 the Cenomanian of the Sarthe has been given by Guillier. 1 



For the identification of the sponges, polyzoa, and hydrozoa we 

 are indebted to Dr. G. J. Hinde, F.G.S. ; the other fossils have been 

 determined by ourselves. 



The first column contains all the fossils met with in the Cenoma- 

 nian of the cliff-section near Havre, the second shows those found at 

 and near Orbiquet, and the third those from Yimoutiers and Lisores. 

 It should be mentioned that many in this third column are specimens 

 given us by M. Lecoeur. In these columns fossils examined and 

 identified by ourselves are indicated by asterisks ; those mentioned 

 by others are indicated by letters — L standing for Lennier, Le for 

 Lecoeur, for d'Orbigny, and W for Wright. 



In order to compare this fauna with that of the Warminster 

 Greensand on the one hand and the Lower Chalk on the other, we 

 have indicated in the fourth and fifth columns the species which 

 occur in these formations. By the Warminster Greensand we mean 

 the sand lying between the Chert Beds of Warminster and the 

 Chloritic Marl, and, so far as we can ascertain, 58 species out of 

 99 are common to the French Cenomanian and the Warminster 

 Greensand, polyzoa being excluded. 



The Lower Chalk of the fifth column is regarded as including the 

 Chloritic Marl and the basement-beds of Dorset and Chard, but does 

 not include the species which only occur in its representative on the 

 Devon coast. Such species as only occur in the basement-beds are 

 indicated by the letter B. Including these, 63 out of 99 species 

 are common to the French Cenomanian and our Lower Chalk. 

 Polyzoa are left out of account, because the Cretaceous species are 

 greatly in need of revision, and it is uncertain what species range 

 into the Lower Chalk. 



It appears, therefore, that the percentage of Cenomanian species 



1 ' G<5ologie de la Sarthe/ Le Mans, 1886. 



