CONTENTS OF No. 169.-New Series. 



MEMOIRS : 



PAGE 



Contributions to flie Embryology of the Marsupialia. Parts TI and 

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

 in the University of Sydney, New Soutii Wales. (With Plates 

 1 and 2) 1 



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

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

 Jjaboratories of the Royal College of Science). (With Plate 3) . 23 



On the Sensory Pit of the Cro tali use. By G. S. West, B.A., 

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

 Plate 4) 49 



A Re-investigatiou of the Eaily Stages of the Development of the 

 Mouse. By J. W. Jenkinson, M.A. (Willi Plates 5 and 0) . Gl 



The Structure of the llostellum in two New Species of Tapeworm, 

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

 of Biology in the University of Otago, New Zealand. (With Plates 

 7 and 8) 83 



The Habits and Early Development of Cerebratulus lacteus 

 (Verrill). A Contribution to Physiological Morphology. By 

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



