CONTENTS. 



CONTENTS OF No. 169, N.S., FEBRUARY, 1900. 



MEMOIRS : 



Contributions to tlie Embryology of the Marsupialia. Parts II and 

 III. By Jas. p. Hill, B.Sc.Edin., F.L.S., Demonstrator of 

 Biology in tlie University of Sydney, New Soutii Wales. (With 

 Plates 1 and'^2) ....... 



Studies in the Retina: Rods and Cones in the Frog and in some 

 other Amphibia, By H. M. Beknard, M.A.Cantab, (from the 

 Biological Laboratories of the Royal College of Science). (With 

 Platens) 



On the Sensory Pit of the CrotalinjB. By G. S. West, B.A. 

 A.R.C.S., Student of St. John's College, Cambridge. (Witl 

 Plate'^4) . 



A Re-investigation of the Early Stages of the Development of the 

 Mouse. By J. W. Jenkinson, M.A. (With Plates^S and"G) 



The Structure of the Rostellum in Two New Species of Tapeworm 

 from Apteryx. By W. Blaxland Benham, D.Sc, M.A., Pro- 

 fessor of Biology in the University of Otago, New Zealand 

 (WithPlates 7 and^S) . . ' . . . 



The Habits and Early Development of Cerebratulus lac tens 

 (Verrill). A Contribution to Physiological Morpiiology. By 

 Chas. B. Wilson. (With Plates''9— 11) . . . 97 



23 



49 

 61 



83 



CONTENTS OF No. 170, N.S., APRIL, 1900. 



MEMOIRS: 



On the Reaction of Daplmia magna (Straus) to certain Clianges 

 in its Environment. By Ernest Warren^ D.Sc, University 

 College, London ...... 199 



