42 MR. E. LYDEKKEK OX CERTAIN 



these specimens it is evident that the qiiadrato-jugal must have 

 been attached. By comparison with the skull of Scapliognaihus 

 Piirdom^ it is evident that the smaller quadrate indicates an 

 Ornithosaurian of the same approximate size as that species, while 

 the other figured quadrate indicates a much larger form. These 

 specimens show conclusively that the flat internal plate described 

 in Mr. Xewton's figures of the skull of ScapTiognatlius Purdoni as 

 part of the quadrate, is really a portion of the pterj-goid, and, conse- 

 quently, that the relation of the quadrate to the pterygoid in the 

 Ornitliosauria is the same as in the BJiyncJiocepliSXia, and quite 

 different from that obtaining in the recent Crocodilia, where those 

 two bones are widely separated. So far as I can gather from the 

 figures published by Professor Marsh, many Dinosaurs had the 

 pterygoid ankylosed to the quadrate after the llhynchocephalian and 

 Ornithosaurian plan. 



AYith regard to the species to which the specimens under con- 

 sideration may have belonged, I find, by comparison with the above- 

 mentioned skeleton of Rhamijliorliynclms grandis, from the Litho- 

 graphic Limestone, that the smaller quadrate would agree approxi- 

 mately in relative size with the so-called Pterodactylus Manseli, 

 Owen, founded upon the distal portion of the humerus *. The 

 ]arger quadrate would agree more nearly with the so-called Ptero- 

 dactylus supra-jurensis of Sauvagef? founded upon a coraeoid 

 from the Kimeridgian of Boulogne; and, in the absence of any 

 evidence to the contrary, I propose to refer it provisionally to that 

 species. In the ^ Catalogue ' cited I stated that there was no 

 evidence for referring Pterodactylus Manseli (and the allied or 

 identical P. PJeydelli) to Pterodactylus ; and from the large size of 

 the specimens under consideration, and their marked resemblance 

 to the quadrates of P7iamj)ho7-hynchiis grandis and Scapliognathus 

 Purdoni, I consider it probable that Pterodactylus Manseli, P. Pley- 

 delli, and P. supra-jurensis are all three referable either to Rliamplio- 

 rliynclius or Scapliognathus ; and, since the former genus appears to 

 be of commoner occurrence in the Lower Kimeridgian Lithographic 

 Limestones than the latter, I am inclined to provisionally refer all 

 three species to RhampJiorhynchus. 



II. Vertebra and Tibia of a Coeluroid Dinosaur. 



In the ' Geological Magazine ' ij: I described two Dinosaurian 

 vertebrae from the -Wealden of the Isle of Wight under the name of 

 Calamospondylus Focci^ being at that time unaware that the generic 

 name had been previously suggested §, although without a defini- 

 tion, for the form subsequently described as Aristosuchus pusillus. 

 Although the description of the original Calamospondylus is vague, 

 it is undoubtedly a preoccupation of the name, and I accordingly 



* See ' Catalogue,' &e., p. 40. 



+ Bull. Soc. Geol. France, ser. 3, vol. i. p. 375 (1873). 



X Decade 3, vol. vi. p. 121 (1889). 



§ Fox, Geol. Mag. decade 1, vol. iii. p. 383 (1866). 



