OOLITIC DINOSAURS. 595 



and the reduction of length in the ten terminal ones not to be more than is there shown, 

 the length of the tail of Cetiosaurus longus may be set down at 17 feet. Thus we get 

 an approximative idea of the length of this Cetiosaur, minus the head, as 31 feet. The 

 fortunate discovery of the skull or lower jaw^, or a mandibular ramus, would supply the 

 ground for completing an idea of the size of the whole animal. As the femur of Cetio- 

 saurus longus found in 1868 in the Enslow locality exceeded in size that found in 1848, 

 so the subject of cut, fig. 7, may ultimately prove not to represent the extreme size 

 attained by individuals of the species; and the length of 7 inches shown by the typical 

 caudals would found an estimate of 35 or 36 feet for the length of trunk and tail of 

 Cetiosaurus longus. 



As evidence of this species have now reached me from four counties — Yorkshire, 

 Northamptonshire, Buckinghamshire, and Oxfordshire — I submit that there is no case, 

 according to the ' canons of zoological and botanical nomenclature' adopted by the 

 ' British Association for the Advancement of Science,' * for suppressing the original 

 name proposed by the discoverer of the species, and substituting one which is in ome 

 degree misguiding. I would also plead for a retention of the orthography of the generic 

 name.f 



In my " Report on British Fossil Reptiles," Part \\,% I referred to the pateontologist, 

 who, in 1869, was deservedly characterised as "that remarkable man whose recent death 

 all who are interested in the progress of sound palaeontology must deplore, Herman von 

 Meyer, "§ in the following terms : — "In the tabular arrangement of extinct Saurians 

 founded by M. Herm. v. Meyer on the development of their organs of motion, the 

 Megalosaurus and Iguanodon are grouped together in Section B, with the following 

 character : — Saurians with locomotive extremities like those of the bulky terrestrial 

 Mammals : ' (Saurier mit Gliedmassen ahnlich denen der schweren Landsaiigethiere).' — 

 PaJaologica, p. 201. No other grounds are assigned for their separation from other 

 Saurians." The needful quest of such grounds led to the discovery of characters which, 

 with the essential unlikeness of the limb-bones of the two cited genera to those of any 

 mammal, the inappropriateness of the name given to the family, and the evidence of the 

 claims of the reptiles under review to form a group higher than a subordinate section of 

 an order, weighed with me in defining the characters of such higher group, and to propose 

 for it the name Binosauria, a step which I still deem to be in the interests of " sound 

 palaeontology." 



In support of the statement that " Prof. Owen, nine years afterwards, conferred a 

 new name upon the group and attempted to give it a closer definition," Professor Huxley 

 refers to Von Meyer's paper in the ' Isis ' for 1830, admitting that he had " not verified 



* ' Report of the Committee,' &c., for the year 1842. 



t In framing this name the diphthong in kIiteios was dropped, as in 'pliocene,' ' miocene,' &c. 



J 'Reports of the British Association,' 8vo., 18-11, p. 103. 



§ Prof. Huxley, 'Quarterly Journal of the Geological Society,' vol. xxvi, p. 32, 1870. 



