CONTENTS. 



Pars I. 



{Published Aug. 23, 1901.) 



PAGE 



Negative Pbototaxis and Other Properties of Littorina as Factors 



in Determining its Habitat. — K. Mitsükuri 1. 



On the Lampreys of Japan together with Notes on a Specimen from 



Siberia. — S. Hatta 21. 



Gonyaulax and the Discolored water in the Bay of Agu. — 



T. NlSHIKAWA 31. 



« 



Keminiscence of Holoblastic Cleavage in the Egg of the Shark, 

 Heterodontus (Cestracion) Japonicus Macleat. Tab. I. — 

 B. Dean 35. 



On the Belation of the Metamerie Segmentation of Mesoblast in 

 Petromyzon to that in Amphioxus and the Higher Craniota. — 

 S. Hatta 43. 



Pars II. 



Published March 22, 1902. 



Über das Blu tgefässsy stem der Hirudineem — A. Oka 49. 



On the Habits of the Japanese Lingula. — N. Yatsu 61. 



The Salmon and Trout of Japan. — D. S. Jordan 69. 



On a new Enteropneust from Misaki, Balanoglossus Misakiensis 



n. sp. — H. Kwano 77. 



