TRANSACTIONS 



OF THE 



ROYAL SOCIETY OF EDINBURGH. 



VOLUME LI, PART II.— SESSION 1915-16. 



CONTENTS. 



PAGE 



VII. Studies on the Development of the Horse. I. The Development during the Third Week. By 

 J. Cossar Ewart, F.R.S., Regius Professor of Natural History, University of Edinburgh. 

 (Plates IX-XVIII and Twenty-one Text-figures), ... 287 



(Issued December 14, 1915.) 



VIII. Description of a Reconstruction Model of a Horse Embryo Twenty-One Days Old. By Professors 

 Arthur Robinson, M.D., and A. Gibson, M.B., F.R.C.S. (Plate XIX, figs. 54-63. Text- 

 figs. 22-26), .......... 331 



(Issued January 17, 1916.) 



IX. A Contribution to the Study of the Scottish Skull. By Matthew Young, M.D., Senior Demon- 

 strator in Anatomy, University of Glasgow. Communicated by Professor Thomas H. 

 Bryce. (With Three Plates), ........ 347 



(Issued January 31, 1916.) 



X. Skiagraphic Researches in Teratology. By Harry Rainy, M.D., F.R.C.P.E., and J. W. 



Ballantyne, M.D., F.R.C.P.E. (With Fifteen Plates), . . .455 



(Issued December 31, 1915.) 



XI. On a Small Collection of Terrestrial Isopoda from Spain, with Descriptions of Four New Species. 

 By Walter E. Collinge, M.Sc, F.L.S., etc., Research Fellow of the University of 

 St Andrews. Communicated by Professor M'Intosh. (With Two Plates), . . 461 



(Issued December 28, 1915.) 



XII. The Lateral Sense Organs of Elasmobranchs : The Ampullary Canals of the Genus Rata. By 

 Augusta Lamont, B.Sc, Baxter Scholar in Natural Science, University of Edinburgh. 

 Communicated by Professor J. C. Ewart. (With Eight Plates and Nine Text-figures), . 467 



(Issued January 15, 1916.) 



EDINBURGH: 



PUBLISHED BY ROBERT GRANT & SON, 107 PRINCES STREET, 



AND WILLIAMS & NORGATE, 14 HENRIETTA STREET, CO VENT GARDEN, LONDON. 



MDCCCCXVII. 

 Price Thirty-three Shillings. 



