1890.] 



Presents. 



459 



(a.) The early assumption of their permanent position by the 

 limbs. 



(b.) The late appearance and obviously degraded character of the 

 hyoid portion of the tongue-bone. 



(c.) The position of the nostrils and the peculiar mode of develop- 

 ment of the respiratory section of the nasal chamber. 



(d.) The total absence of clavicles. 



Such characters as the position of the basi-pterygoid processes, the 

 broad vomer, and the presence of Jacobson's cartilages, being 

 paralleled in existing Carinatse, some of them even in Passerines, can 

 hardly be considered as of fundamental importance, since they may 

 be derived from a proto-carinate or from an early typical carinate 

 stock. 



Before considering the peculiarities in the development of the 

 sternum as of fundamental importance, it will be necessary to study 

 that of the flightless Carinatas, and especially of Stringops. 



The general balance of evidence seems to point to the derivation of 

 both Ratitse and Carinatae from an early group of typical flying birds 

 or Proto-Carinatce. 



IV. " Notes on some peculiar Relations which appear in the Great 

 Pyramid from the precise Measurements of Mr. Flinders 

 Petrie." By Capt. Downing, R.A. Communicated by Sir 

 F. Abel, F.R.S. Received March 13, 1890. 



Presents, April 17, 1890. 



Transactions. 



Baltimore : — Johns Hopkins University. Circular. Vol. IX. 

 No. 79. 4to. [Baltimore'] 1890 ; Studies in Historical and 

 Political Science. Eighth Series. No. 3. 8vo. Baltimore 1890. 



The University. 



Berlin : — Physikalische Gresellschaft. Verhandlungen. 1889. 8vo. 



Berlin 1890. The Society. 



Cambridge, Mass. : — Museum of Comparative Zoology, Harvard 



College. Memoirs. Yol. XVII. No. 1. 4to. Cambridge 1890. 



The Museum. 



Catania : — Accademia Gioenia di Scienze Naturali. Atti. Ser. 4. 



Vol. I. 4to. Catania 1889. The Academy. 



Dublin : — Royal Historical and Archaeological Association of 



Ireland. Journal. Vol. IX. No. 81. 8vo. Dublin 1890. 



The Association. 

 vol. xlvii. 2 M 



