On the Development of Araneina. 



by 



Kamakichi Kishinouye, Rigakushi. 



Science College, Imperial University. 



With Plates XI— XVI. 



The following' observations où the development of Araneina were 

 made in the Zoological Laboratory of the Imperial University during- 

 the academic session of 1888-9. S<mie of the results I have arrived at 

 seem to be not without interest, l^efore going further I wish to 

 express my thanks to my teachers, Dr. K. Mitsukuri and Dr. I. Ijinia 

 for their kind and valuable advice during my work. 



The materials used for the investigation were all collected by 

 myself during the summer of 1888 in the grounds of the university. 

 The genera that have been most carefidly studied are Lycosa and 

 Agalena, while Theridion, Epeira, Dolomedes, Pholcus were more or 

 less examined for comparison. A species of Lycosa which is very 

 abundant among grasses breeds constantly from the end of March to 

 the latter part of September, and carries about the cocoon so that we 

 are able to obtain its eggs in various later stages with great ease. 

 It, however, failed to breed in captivity, and for this reason, in the 

 study of earliest stages recourse wns had to the eggs of a species oî 

 Agalena which breeds very freely in captivity. The statements made 

 in the following pages refer to all the species examined unless otherwise 

 specified. 



