A. J. Jukes-Broiciie — Tico Stages in Upjjer Chalk. 313 



luive yet been found in our ' Upper Chalk ', but so far as their evidence 

 goes it confirms that of France and Germany. In the following table 

 the separate records for the zones of 0. pilula and A. quadratus are 

 based on those given by Messrs. Griffith & Brydone, and on the fact 

 that the highest beds in the Yorkshire cliff's belong to the former zone, 

 though true A. qiiadratus has recently been found by Mr. Stather 

 near Bridlington. * 



TABLE III. 

 Cephalopoda of the Upper Chalk in England. 



The total number of species enumerated above is twenty-four, of 

 which twelve occur in the four lower zones and thirteen in the higher, 

 the only Aiumonoid which is ostensibly common to the two faunas 

 being Pachy discus leptophyllus ; but there is no doubt that several 

 species have been included under this name, and that when they have 

 been differentiated one form will prove to be restricted to the lower 

 zones. The only locality yet known where A. quadratus occurs in 

 the zone of 0. pilula is the Salisbury district, where it prevails, as 

 Dr. Blackmore informs me, to the exclusion of A. granulatus. 



[To he concluded in our next Ntimler.) 



