294 ON THE SUPPOSED CLAVICLE OF DiPLODOcus. [June 6, 



The existence of clavicles in Dinosauria must therefore still be 

 considered doubtful. 



In conclusion, I wish to express my thanks to Mr. Boulenger, 

 Dr. Forsyth Major, Mr. Pycraft, and Dr. A. S. Woodward at the 

 British Museum, and to Professor Stewart and Mr. R. H. Burne 

 at the Royal College of Surgeons, for their kind help in studying 

 so intricate a question. 



Literature. 



Gadow & Selenka. — Birds : Bronn's Klassen und Ordnungen d. 



Thierreiches, vol. vi. part iv. 

 GiLBER. — " Das Os priapi der Saugethiere." Gegenbauer's 



Morphologisches Jahrbuch, 1891. 

 Hatcher. — " Diplodocus carnegiiy Memoirs of Carnegie 



Museum, Pittsburg, vol. i. 

 . " Osteology of Haplocayithosaurus, with Appendix on 



Diplodocus." Loc. cit. vol. ii. 

 [IS^OPCSA.] — Ci'itical Review of Hatchei''s Paper on Haplocantho- 



saurtis. Keilhack's Geologisches Centralblatt, 1904. 

 Weber. — Die Saugethiere. Leipzig, 1903. 

 WiEDERSHEiM. — Lelirbuch der vergleichenden Anatomie d. 



Wirbelthiere. Leipzig, 1902. 



