EEEANTIATE POLYCHAETA OF JAPAN. 209 



parapodium has a prominent process, to whicli the inner edge of 

 ventral cirrns is attached. 



Notophylliiiu Japonictim Marenz. 



1870. Notopli^'llum japonicum, Marenzeller. Siidjap. Aunel., p. 18, 

 Taf. TIT, fig. 1. 



Prostomium roundish-pentagonal, somewhat broader than 

 long ; anteriorly a little prolonged. Median tentacle small, not 

 reaching to front end of prostominm. Lateral tentacles in 2 

 pairs ; the ventral pair arising from about the anterior border 

 and ventral side of prostomium, and the dorsal pair from 

 the dorsal surface of prostomium inside the anterior border 

 of eyes, which are very large and are placed near the lateral 

 border. 



Body, consisting of 25 segments, measures 10 mm. in length, 

 and about 1.5 mm. in breadth in the anterior as well as in the 

 posterior parts, and about 2 mm. in the middle. 



First segment is not visible in dorsal aspect ; second 

 segment short, being scarcely one half the length of the next 

 following. Each of the 2 anteriormost segments bears a pair 

 of tentacular cirri on each side. Those of the first segment are 

 short, the longer being J the length of prostomium ; and those 

 of the second segment twice as long as prostomium, reaching 

 to about 7th segment. 



Parapodium long, biramous ; dorsal ramus rudimentary, 

 having one, rarely two, small aciculoe, which arc smaller than 

 those of ventral ramus. A'entral ramus oval in outline. Dorsal 

 cirrus largo and reniform, borne on the dorsal border of dorsal 

 ramus. Ventral cirrus roundish-cordate, arising from the middle 

 part of the postero-lateral side of ventral ramus. From the 



