On a New Polygordius from Misaki 



(/'. Ijimai n. sp.). 



BY 



Akira Izuka. 



Larvae believed to be those of Polygordius have from time to time been 

 obtained in the neighbourhood of the Misaki Marine Biological Laboratory 

 without the mature worm having been discovered. During the last 

 spring, however, I succeeded in obtaining, at a spot of the sea-shore close 

 to the Laboratory, a large number of adult Polygordius, probably the 

 generator of the larvae mentioned and which I consider to represent a 

 species new to science. The discovery may be worth recording, since 

 all the species hitherto known * of the genus are from the coasts of 

 Europe. 



I propose to call the Misaki species 



Polygordius Ijimai 



in dedication to Professor Isao Lima of the Science College, Tokyo. 



The thin and cylindrical body measures 70-77 mm. in length and 

 0.6-0.8 mm. across in the middle part of the body, where this is broadest. 

 The general colour of females is yellowish pink, lighter in tone in the 



* Six in number, viz. : 



1. P. lactcus Schneider. (Helgoland). 



2. P. apogon M'Intosh. (Shetland). 



3. P. villoti Perkier. (Roseoff). 



4. P. erythroptlmlmus Giard. (Concarneau). 



5. P. appendiculatus Fraipont. (Naples). 



6. P. neapolitanus Fraipont. (Naples). 



