26 



AKIKA IZUKA. 



towards the tip ; this giound color is interrupted by four black bands, 

 which form incomplete rings open on the dorsal side. 



The buccal segment, is distinctly visible on the dorsal side, and may 

 be looked upon as the first body-segment in counting. Its antero-lateral 

 margin gives origin to the tentacular cirri (tc), one on each side just 

 under the ommatophores. Each tentacular cirrus consists of a basal 

 section bearing two branches, of which the anterior is the shorter. 



The parapodium of the 23rd segment is represented in fig. 4., 

 showing its posterior aspect. It is of the shape of a truncated cone, 

 flattened antero-posteriorly, the base of which is continuous with the 

 lateral side of the segment. On the dorsal side it bears a roundish 

 elytrum (e.) and a tuft of soft white and variously sized papilke, the 

 branditeti tubercles (bt.). On the ventral side, it bears a ventral cirrus 

 (ve.) of such a length that its tip reaches nearly but not quite the 

 distal end of the parapodium. The cirrus consists of a short basal and 

 a long distal segment. Another isolated papilla is found in the lower 

 part of the parapodium, on both the anterior and the posterior surfaces. 



Of the setae there are three kinds: — The "setœ bipennato-pcnicillatce 

 of Kin berg (fig. 7.) are found only in the upper half of the truncated 

 end of the parapodium ; the " selce serrulatœ " (fig. Sa and 8b) occur 

 numerously in the lower part of the same. The third kind of the setae 

 present is light yellowish brown in color and strong and spine-like in 

 appearance (fig. 6.). Of this there are generally seven arranged in a 

 row upon the end surface of the parapodium. 



The acicula, present in a single number in each parapodium, is 

 situated about one-third way up the vertical height of this, pointing 

 its outer end towards the middle of the parapodium end. 



Another appendage of the parapodium is offered by a tuft of long 

 and soft hairs of a golden-yellow color. The tuft arises from the upper 

 half of the parapodium end. It is the production of the " Spinn- 

 dniscii'. The hairs are very long, sometimes reaching to a length of 

 our centimetres or more. Finally, the parapodium shows on the 

 dorsal side a low protuberance, representing the remnant of the dorsa 



