ANNELIDA POLYCHAETA. 465 



region 5 mm.; the number of its segments amounts to 124. 

 The epitocous form measures 9 mm. in breadth. A dark 

 brown patch on the dorsum of each foot , usually also a 

 transverse stripe on each side of the segment; ventral side 

 of the foot marbled with blackish. Cephalic lobe longer than 

 broad, antennae subulate, hardly as long as half the length of 

 the head ; palpi large, projecting far beyond the antennae. The 

 antero-posterior diameter of the buccal segment about one 

 and a half the length of that of the succeeding one ; tenta- 

 cular cirri short, the inferior pair of them shorter than the 

 palpi, the longest of the superior pair projecting a little 

 beyond the tip of the palpi, reversed they reach the 3rd 

 or 5th ring. The anal cirri, situated at the ventral side, as 

 long as the posterior six segments. The feet in front and 

 posteriorly not quite similar. In the anterior feet the lip 

 of the dorsal setigerous lobe bluntly conical, the lips of the 

 ventral lobe very short, not projecting; the superior ligule 

 of the same structure and length as the dorsal lobe , the 

 inferior ligule a little shorter; dorsal cirrus not extending 

 beyond the tip of the superior ligule, ventral cirrus reaching 

 to the middle of the inferior ligule. In the posterior body- 

 region the superior ligule of the feet is considerably en- 

 larged , consisting of a large lamella , which bears near its 

 tip the small dorsal cirrus ; the conical lip of the dorsal 

 lobe reaches only to about the middle of its ventral bor- 

 der; the lips of the ventral lobe are more projecting than 

 in the anterior segments, nearly as far as the inferior ligule. 



In the dorsal lobe there occur only homogomph setose 

 bristles; in the ventral lobe the superior fascicle contains 

 homogomph setose bristles and heterogomph falcate ones, 

 but in the inferior fascicle the setose bristles are wanting. 



In the epitocous form the anterior 19 segments do not 

 show any change. 



Paragnathi of proboscis : Maxillary region , I. two teeth 

 behind each other ; II. small triangular group ; IV. large 

 semilunar group ; III. large group , consisting of a large 

 transverse patch in the middle and a smaller patch of 3 or 



Notes from th.e Lieyden Museum, Vol. X.I. 



