EEEANTIATE POLYCHAETA OP -JAPAN. 119 



Eim/ice tilnann (Pourtales). 

 PI. II, fig. 3. 



1807. Marphysa, tibiaua, Pourtales. Bull. Mus, Comp. Zool. Haiv. Coll., 

 Vol. I, p. 108. 



Body consisting of about 120 segments, measures about 

 40 mm, in lengtli and 2 mm. in breadth including parapodia 

 and at about the middle of Ijody. Colour of body reddish, 

 sligiitiy iridescent. 



Prostomium small, with 5 tentacles ; median tentacle very 

 long, reaching to about 24tli segment when laid back along 

 the body ; inner lateral tentacles about | the length of the 

 median ; outer laterals about \ tlie lengtli of same. Eyes 2. 

 Tentacular cirri 2, situated nearly dorsally, their tips extending 

 slightly beyond the anterior margin of prostomium. 



Parapodium short, with a long slender dorsal, and a short 

 conical ventral, cirrus ; anal cirri short. 



Branchia almost rudimentary ; in tlie shape of a small club- 

 lik'c appendage to the dorsal cirrus on 0th or 7th parapodium ; on 

 lP)th parajK^diiim elongated and 2-branched; on oOtli parapodium 

 3 -branched ; and on nboiii 1 20th imrapodium reduced to a 

 sini])lc tV)i']ii. 



( '(nii|Miini(] iM'istle wiili ;i sinall lancet-shaped, two-hooked 

 and gii;n'(l(Ml end -piece. Tip of ])Ost(M'ior book ])ifin'cated and 

 gnardcd. 



.Maxillai'v f(M-ceps gcnilx" curved, with posterior appendages of 

 a moderafe leiigMi. Tlie great dental plates with S teetli on the 

 left and '.» on flie ii;_rlit ; left unpaired plate 10-toothed; lateral 

 plafe^ will) 7 fc.'ili on the left, and 11 teeth on tlie right. Man- 



