CONTENTS. V 



CONTENTS or No. XCI, N.S., JULY, 1883. 

 MEMOIRS: 



PAGE 



On the Ancestral Form of the Chordata. Bj A. A. W. Hubuecht, 

 Professor of Zoology at the University of Utrecht. (With Plate 

 XXIIl) 349 



The Renal Organs (Nephridia) of Patella. By J. T. Cunningham, 

 Fellow of University College, Oxford .... 3G9 



A Rare Form of the Blastoderm of the Chick, and its Bearing on 

 the Question of the Formation of the Vertebrate Embryo. By 

 C. O. Whitman, Ph.D. (With Plates XXIV and XXV) . 376 



On the Development of the Pelvic Girdle and Skeleton of the Hind 

 Limb in the Chick. By Alice Johnson, Newnham College, 

 Cambridge. (With Plates XXVI and XXVII) . . .399 



The Development of the Mole (Talpa Europe a). The Formation 

 of the Germinal Layers, and Early Development of the Medullary 

 Groove and Notochord. By Walter Heape, Demonstrator in 

 the Morphological Laboratory at Cambridge. (With Plates 

 XXVIII, XXIX, XXX and XXXI) . . . .412 



The Tongue of Ornithorhyncus paradoxus: the Origin of Taste 

 Bulbs and the parts upon which they occur. By Edward B. 

 PouLTON, M.A., of Jesus and Keble Colleges, Oxford. (With 

 Plate XXXII) 453 



Observations upon the Foetal Membranes of the Opossum and other 

 Marsupials. By Henry F. Osborn, ScD., Assistant Professor of 

 Natural Science, Princeton, U.S.A. (With Plate XXXIII) . 473 



CONTENTS OF No. XCII, N.S., OCTOBER, 1883. 



MEMOIRS : 



Observations on the Genus Py thium (Pringsh.) . By H. Marshall 

 Ward, M.A., Fellow of Christ's College, Ca mbridge, Assistant 

 Lecturer in Botany at the Owens College, Victoria University. 

 (With Plates XXXIV, XXXV and XXXVI) . . .485 

 On Budding in Polyzoa. By Alfred C. Haddon, M.A., Professor 

 of Zoology in the Royal College of Science, Dublin. (With 

 Plates XXXVII and XXXVill) 516 



