IV CONTENTS. 



PAGE 



On some Modifications of Structure subservient to Eespiration in 

 Decapod Crustacea which burrow in Sand ; with some Remarks 

 on the Utility of Specific Characters in the Genus Calappa, and 

 the description of a New Species of Albunea. By Walter 

 Gabstang, M.A., Fellow and Lecturer of Lincoln College, 

 Oxford. (With Plates 12—14) 211 



Notes on the Anatomy of Sternaspis. By Ed-win S. Goodrich, 

 B.A., Assistant to the Linacre Professor, Oxford. (With Plates 

 15 and 16) 233 



On the Relation of the Arthropod Head to the Annelid Prosto- 

 mium. By Edwin S. Goodrich, B.A., Assistant to the Linacre 

 Professor, Oxford ...... 247 



On the Development of the Californian Hag-fish, Bdellostoma 

 Stouti, Lockington. By Bashford Dean, Ph.D., Columbia 

 College, N.Y. (Preliminary Note.) (With Plate 17) . . 269 



Oil the Diplochorda. — 1. The Structure of Actinotrocha. 2. The 

 Structure of Cephalodiscus. By A. T. Masterman, B.A., 

 B.Sc, Lecturer and Assistant Professor of Natural History in 

 the University of St. Andrews, N.B. (With Plates 18—26) . 281 



CONTENTS or No. 159, N.S., DECEMBER, 1897. 



MEMOIRS : 



Note on a New British Echiuroid Gephyrean, with Remarks on the 

 Genera Thalassema and Hamingia. By W. A. Herdman, 

 D.Sc, F.R.S., Professor of Natural History in University College, 

 Liverpool. (With Plates 27 and 28) . . . .867 



The Placentation of Perameles. (Contributions to the Embryology 

 of the Marsupialia — I). By Jas. P. Hill, Demonstrator of 

 Biology in the University of Sydney, N.S.W. (With Plates 

 29—33) 385 



On the Green Pigment of the Intestinal Wall of the Annelid 

 Chsetopterus. By E. Ray Lankester, M.A., LL.D., E.R.S,, 

 Linacre Professor and Fellow of Merton College, Oxford. (With 

 Plates 34—37) 447 



