CONTENTS. 



Partes I et II. 

 Published May 25, 1897. 



Introductory K. Mitsukuri i. 



Pear-boror (Nephopteryx rubrizonella, Kag.) With 



Plate I M. Matsumvra.... 1. 



On Two New Species of Asthenosoma. With Plate II S. Yoshiwara 5. 



Chaetognaths of Misaki Harbor. With Plate III T. Aida 13. 



On the Accommodation of Some Infusoria to the Solution 



of Certain Substances in Various Concentrations h Yasuda 23. 



On Changes which are found with Advancing Age in the 



Calcareous Deposits of Stichopns japonicns, Selenica.. K. MitsukuH 31. 



Eevision of Hexactinellids with Discoctasters, with De- 

 scriptions of Five New Species I. Ijima 43. 



Miscellaneous Notes 61. 



Ueber eine in Misaki vorkommende Art von Ephelota und über ihre Sporen- 

 bildung, von C. Ishikawa. — Die Entwickelung der Gonophoren bei Physalia 

 maxima, von S. Goto. — On the Fate of the Blastopore, the Eelations of the 

 Primitive Streak, and the Formation of the Posterior End of the Embryo 

 in Chelonia, together with Eemarks on the Nature of Meroblastic Ova in 

 Vertebrates, by K. Mitsukuri. — Living Specimen of Pleurotoinaria Bey- 

 richii. — -The Ophiuran Shoal. — Zoological Society of Tokyo. — List of 

 Japanese Zoologists. 



Pars III. 



Published August 10, 1897. 



On a Mode of the Passage of the Eye in a Flatfish T. Nishi/cawa 73. 



On the Growth of the Ovum in Chaetognaths. With 



Plate TV T. Aida 77. 



Notes on the Paludina-Species of Japan. With Plate V...'/'. Iwakawa 83. 



Dendrocoryne, Inaba, Vertreterinn einer neuen Familie 



der Hydromedusen. Mit Taf. VI S. Goto 93. 



On a New Species of Malacobdella (M. Japonica). With 



Plate VII U. Takakura 105. 



Notes on the Breeding Habit and Development of Rkaco- 



phorus Schlegelii, Günther S. Ikeda 113. 



Miscellaneous Notes 123. 



Zoological Society of Tokyo. — The New Imperial University of Kyoto. 



