ERKANÏIATE POLYCHAETA OF JAPAN. 



37 



bulb, ending with terminal filament of a considerable length. 

 Lateral tentacles shorter and more slender than the median, and 

 the subterminal bulb less prominent than in th.e latter. Subten- 

 tacles fairly develoi)ed, gradually tapering toward the tip, which 



abruptly becomes fihform. Tenta- 

 cular cirri resemble the tentacles. 



Dorsal cirri with a distinct 

 subterminal bulb in the anterior 

 segments, but soon lose this, and 

 the organs assume a simple hliform 

 character. Ventral cirri short and 

 subulate, the tip extending a little 

 beyond base of bristles. Nephridial 

 papilla well developed, its base 

 indicated by a pigment- speck in the 

 greater part of body. 



The number of elytra is up- 

 wards of 50 pairs. In the typical 

 forms there is a large ovoid, black- 

 ish, or dark olive pigment -spot on 

 the inner side ol the surface of 

 attachment ; the latter is charac- 

 terized ]iy the ])i'esence of a very 

 distinct ring of the same colour. 

 ?*h)reover, a series of very distinct 

 whitish spi'cks occur all over the 

 gi'eater }i;irt ol' the surface. There 

 are a very few, minute, clavate 

 liapihae on the enter part of elytra, 

 ^hirgin of elytra perfectly smooth. 



.1 



/; 



.1. 'lip uf il sfroii<; btistlcR from the [iDtL 

 pnnipuilium of ]'. ureUnln. fcOO/l. 



B. Tip of nil rtver.ipo vcnlnil Imstlc from 

 the 2()lli luiraiiotlium of snme. 8ÜÜ, 1. 

 [AftiT W. ( . Jl.Idto.sh.] 



