28 



AKÏRA IZUKA. 



segment) is about one and a half times as long as the length of the 

 parapodium. The ventral cirrus in the third segment is a little shorter 

 than that in the second; and that in the fourth segment is again 

 longer than the next foregoing, being about equal in length to that 

 in the second segment. Posteriorly from the fifth segment the 

 ventral cirri remain nearly the same in size, while the parapodia enlarge 

 themselves. 



The " setœ bipennato-penicillatœ'" begin to appear from the 8th 

 parapodia. The " setœ scrrulatœ " are found in a very few number, 

 on the first parapodia. On more posterior parapodia they grow more 

 and more numerous and are placed in the lower part of the tip of 

 parapodia. 



The spine-like setœ begin to appear in the second parapodia, in 

 which they number five or six. The number increases up to ten on 

 more posteriorly situated paradodia. 



The " Spinn-drtiscii" begin to be found from the 8th segment 

 Nothing is known about the tube, though the presence of the glands 

 just mentioned indicate its formation by the species. 



The Intccal orifice, when closed, shows strong radial folds on its 

 margin. 



The proboscis in the protruded state is strikingly large and strongly 

 muscular (fig. i.). It is flattened dorso-ventrally and the anterior end 

 shows (dorsal and ventral) lips, each of which is provided in the middle 

 with a long papilla (;///>.) of a bluish-white color. The edges of both 

 lips are lined with a row of tooth-like papilla? (p.); the row on each lip 

 being interrupted in the middle by a gap. Internally to the rows of 

 papilla? are the jaws arranged in two pairs, a dorsal and a ventral. 

 Each jaw (fig. 3.) is furnished with a comparatively very strong apical 

 tooth and a row of seventeen small teeth on the cutting edge. The 

 apical ends of the two jaws in a pair meet together in the median line. 

 October, 1901. 



