CONTENTS OF LA.ST ISSUE 



Introductory K. MitsuTcuri i 



Pear-borer (Nephopteryx rubrizonella, Rag.) M. Matsumura .. ! 



On Two New Species of Asthenosoma from tbe 



Sea of Sagami 8. Yoshiwara ... 5 



Chaetognaths of Misaki Harbor T.Aida 13 



On the Accommodation of Some Infusoria to tbe 



Solutions of Certain Substances in Various 



Concentrations... A. Yasuda "23 



On Changes which are found with Advancing Age 



in tbe Calcareous Deposits of Stichopus 



japonicus, Selenica K.MitsuJcuri .... Hi 



Revision of Hexactinellids with Discoetastei's, with 



Descriptions of Five New Species I. Ijima 43 



Miscellaneous Notes til 



Ueber eine in. Misaki vorkommende Art von Ephelota und über ihre Sporenbildung, von 

 C. Ishikawa. — Die Entwickelimg der Gonophoren bei Physalia maxima, von S. Goto. 

 — On the Fate of the Blastopore, the Relations of the Primitive Streak, and the 

 Formation of the Posterior End of the Embryo in Chelonia, together with Remarks on 

 the Nature of Meroblastic Ova in vertebrates by K. Mitsukdri — Living Specimen of 

 Pleurotomaria Beyrichii. — Tlie Ophiuran Shoal. — Zoological Society of Tokyo. — List of 

 Japanese Zoologists. » 



