ß Art. 5. — A. Izuka : 



the former being slightly shorter than the latter; the third pair is 

 bifurcated, its dorsal branch being shorter than the second pair, 

 while the ventral branch is again shorter than the dorsal; the 

 remaining three pairs of tentacular cirri, borne on the 4th, 5th and 

 6th segment respectively, are also bifurcated into a lanceolate 

 longer dorsal and a shorter ventral branch. 



The 7th segment is the anteriormost of those which bear 

 parajodia provided with seta?. 



Typical parapodium, the ] 8th (PL I, fig. o. ), is lanceolate, 

 with a cirriform appendage at tip; dorsal cirrus, somewhat oval 

 and short-necked, arising near dorsal base of parapodium and 

 extending for more than J the length of the latter; ventral cirrus, 

 narrower and longer than the dorsal, reaching to nearly f the 

 length of parapodium; aciculum single; setae compound, with a 

 long terminal piece (PI. I, fig. 7.). 



In the posterior region of body, the parapodium (PI. I, fig. 6.) 

 is more slender than that of anteriorly placed segments and the 

 dorsal cirrus is much elongate, reaching nearly to tip of para- 

 podium, while the ventral cirrus becomes enlarged and somewhat 

 elliptical in outline. 



The first pair of side-glands is found on the 7th segment 

 (or the first parapodiated segment), and the 2nd and the 3rd 

 pair occur on the 8th and the 9th segment respectively. Then, 

 after an interval of two glanclless segments, the glands reappear on 

 segments 12th, 18th, 14th and 15th to be followed again by three 

 glandless segments. In more posterior parts of body, glandiferrous 

 and glandless segments make alternate succession, either occuring 

 3-5 (but sometimes only 1, at other times 6 and rarely 7) together 

 at a time in consecutive series. 



The side-glands in anterior and middle regions of body are 

 small, appearing only as deep brownish areas on sides of segments 

 in both dorsal and ventral aspects (figs. 1 , 3). In posterior region 

 of body the glands are much larger (fig. 4) in the ventral aspect, 

 in some cases those of the two sides nearly meeting in the median 

 line, though in the dorsal aspect the increase in their size is not so 

 marked as in the ventral. 



