THE CEPHALOPODA. 
203 
Dr. Oppel, in his ' Juraforraation,'' 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 Palgeontographical 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., E.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 Possil 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 difii'erent sections of these remarkable fossils had been rendered inevitable 
by subsequent discoveries. 
1 'Die Juraformation Englands, Frankreichs, and S.-W. Deutschlands,' 1859. 
2 'Palaeontologische Mittheilungen,' vols, i, ii, 1862-63. 
•* Geologists' Association, ' Chief Groups of the Cephalopoda,' 1869. 
