ANNELIDA POLYCHAETA. 169 



In a bottle containing Annelida, probably dredged with 

 the tow-net in the Malayan Archipelago by Mr. Hoedt, I 

 found several examples of this A^m's-species. Except one 

 specimen they are all incomplete, the anal region being 

 wanting or only partly regenerated. The males appear not 

 to be smaller than the females. Almost all individuals are 

 marked by two parallel, transverse, black stripes on the 

 dorsum of the feet, most distiuct in the posterior body- 

 region. The length of the tentacular cirri seems rather 

 variable , for , in one specimen the longest of them reaches 

 to the 5th segment, and in another one to the 8th ring. 

 Though in the males the epitocous transformation of the 

 feet commences at the 21st segment, we find already marks 

 of it at the 20th segment, which shows small lamellae at 

 the base of the dorsal and ventral cirri. In the females the 

 change of the feet commences at the 23rd segment, but 

 faint marks of it are already visible at the two preceding 

 segments. There are also some differences between the feet 

 of the anterior segments in the males and females. In this 

 body-region the dorsal and ventral cirri are gibbous at the 

 base, their distal end being very slender; in the males the 

 anterior 7 feet show this character , in the females it is 

 only observed at six of them. As in other Heteronereis-iorms 

 the dorsal cirrus of the males in the posterior body-region 

 is provided with papillae along its ventral border; but in 

 the vicinity of the anal end this character disappears , as 

 is already observed by Ehlers in epitocous examples of JV. 

 Dumerilii. In our specimens this change occurs at the 60th 

 segment; here the dorsal cirri have lost their papillae and 

 show the appearance of those of the females. The dorsal 

 cirri of this body-region show a curious abnormity in both 

 sexes: they are in several segments considerably elongated 

 and extend far beyond the tip of the superior ligule. This 

 abnormal elongation of the dorsal cirrus occurs very irre- 

 gularly , for often it is present at the left foot of a segment 

 and wants at its right side. Such dorsal cirri of different 

 length are also observed by Grube in some Sy Ms-species. 



Notes from the Leyden Museum, Vol. XI. 



