CONTENTS: 



I. Negative Phototaxis and Other Properties of Littorina as 

 Factors in Determining its Habitat. 



By K. Mitsukuri 1 



II. On the Lampreys of Jap in together with Notes on a Speci- 

 men from Siberia. \ 



; ; (>.M<i n 1 !.,():•: Hi ' ' - - ' • •: *>T 



By S. Hatta 2L 



III. Gonyaukx and the Discolored Water in the Bay of Agn. 



By T. Nishikawa 31 



IV. Reminiscence of Holoblastic Cleavage in the Egg of the 

 Shark, Heterodontus (Cestracion) Japoxicus Macleay. 



By Bashford Deax 35 



V. On the Relation of the Metamerie Segmentation of Mesoblast 

 in Petromyzon to . That in Amphioxus and . the Higher 



Craniota. 



By S. Hatta 43 



