THE CEPHALOPODA. 203 



Dr. Oppel, ill his ' Juraformation,'^ and in his later and larger work on the Ammonites 

 of the Malm formation of Germany, and the Jurassic formations of India, delineated 

 in ' Palaeontologische Mittheilungen,'^ adhered to the classification of von Buch. 



Between 1863 and 1870 the late lamented Prof. Phillips, of Oxford, contributed five 

 parts of his unfortunately unfinished Monograph on another important group of the 

 Possil Cephalopoda, viz. the Belemnites, in the volumes of the Palseontographical Society, 

 issued for the years 1863, 1864, 1866, 1868, and 1869. 



My old esteemed friend, the learned Secretary of the Palseontographical Society, the 

 Rev. Thos. Wiltshire, M.A., F.G.S., in 1867 contributed a valuable memoir on the 

 chief groups of the Cephalopoda to the Geologists' Association,' and in an Appendix to 

 this work added an Analysis of the Families and Genera of the Fossil Cephalopoda, 

 with their range in time. This resume of a very difficult subject has been so carefully 

 prepared by its author that I shall, with permission, insert it in extenso (at pages 204 

 to 218), as it clearly exhibits the actual state of the systematic classification of the 

 Cephalopoda at the date of its publication, and before changes in several of the groups 

 composing the different sections of these remarkable fossils had been rendered inevitable 

 by subsequent discoveries. 



* 'Die Juraformation Englands, Frankreichs, and S.-\V. Deutschlands,' 1859. 



"' ' Palaeontologisclie Mittheiluiigeu,' vols, i, ii, 1862-63. 



^ Geologists' Association, ' Chief Groups of the Cephalopoda,' 1809. 



