X INTRODUCTION. 



humerocristatus or manseli. The vertebra of B. robustus is probably 

 also referable to the same suborder, and may belong to an immature 

 Cetiosaurus. 



It has been recently pointed out by the writer * that teeth from 

 the Forest Marble described by Owen 2 as Cardiodon rugulosus are 

 probably referable to Cetiosaurus ooconiensis, in which event the 

 former name should replace Cetiosaurus, and the family name Car- 

 diodontidce that of Cetiosauridce. It should also be observed that it 

 has recently been stated by Prof. Prestwich 3 that the bones of 

 Cetiosaurus preserved in the Oxford Museum, of which the casts are 

 entered on p. 138, are from the Porest Marble, and not from the 

 Great Oolite, as stated by Phillips. 



The writer's attention has been directed to the circumstance that 

 the name Hoplosaurus armatus has been applied by Gervais 4 to the 

 Dinosaur represented by the tooth figured in Part I. p. 147, and 

 provisionally referred to Ornithopsis. If this reference be correct 

 the name Hoplosaurus must supersede Ornithopsis ; but on reflection, 

 the author considers that there is no justification for the suggestion 

 made on p. 145 of the same Part that the still earlier name Ptloro- 

 saurus, if likewise identical, should not be adopted. In any case, 

 Pelorosaurus, based on the humerus, and Hoplosaurus on the tooth, 

 are respectively the first and second names proposed for the members 

 of the family of Sauropoda provisionally termed Atlantosauridce, 

 and therefore supersede all those mentioned on p. 146 of Part I. 

 The jaw No. R. 751 (p. 147) appears to be part of the left dentary 

 instead of the right maxillary. 



The teeth provisionally referred by Mantell and Owen to Hylceo- 

 saurus, and entered on p. 185 under that heading, appear to be 

 Sauropodous, and have the relatively small size of the teeth (Car- 

 diodon) referred by Phillips to Cetiosaurus occonitnsis ; it is possible 

 that this type of tooth may prove to belong to Cetiosaurus brevis, 

 or it may indicate a smaller form. Prof. Marsh 5 has referred the 



1 Quart. Journ. Geol. Soc. vol. xlv. p. 245 (1889). 



2 Odontography, pt. ii. p. 291, pi. 75 A. fig. 7 (1841). It may be mentioned 

 that the dates of publication of the three parts in which this work originally 

 appeared are, according to Engelmann, as follows, viz. — 



Part 1 (1840)— plates i.-ii. and 1-48. 

 „ 2(1841)— „ 49-87. 

 „ 3(1845)- „ 87^-150. 



3 Geology, vol. ii. p. 211 (1888). 



1 Zool. et Pal. Franchises, 1st cd. p. 263 (1849-52). See also 2nd ed. p. 4(>4 

 (1859). The name is here given ue Oplosaurus. 

 5 Amcr. Journ. ser 3, vol. xxxvii. p. 325 (1889). 



