ON a remarkable; syllis-bud. 11 



NOTE IV. 



ON A REMARKABLE SYLLIS-BUD WITH 

 EXTRUDIBLE SEGMENTAL ORGANS. 



Dr. R. HORST. 



(Plate 1 , and plate 2, fig. 1). 



Among a number of pelagic Annelids, collected in the 

 Malayan Archipelago by Mr. D. S. Hoedt, I met with 

 some fragments of a Syllis-species , characterized as well 

 by its large orange-coloured eyes, as by a series of distinct 

 brown spots on each side of the body. The largest frag- 

 ment has a length of about 13 m.m., and is composed of 

 47 segments ; another specimen , that seems to have an 

 anal segment, measured only 9 m.m., the number of its 

 segments amounting to 41. 



The head shows a deeply notched anterior margin , and 

 is furnished dorsally and ventrally with two eyes of con- 

 siderable size, resembling those of the Alciopidae; no ce- 

 phalic processes are visible, neither tentacles nor palpi. 

 Each foot (fig. 1) presents a dorsal and a ventral cirrus. 

 The dorsal cirri are articulated and of a very different 

 length, being in one segment thrice, in the other only 

 once as long as the foot; the largest number of its arti- 

 culations is 28. The ventral cirrus is smooth, acute coni- 

 cal , projecting somewhat beyond the apex of the foot. The 

 feet are furnished with a fascicle of 4 to 6 bristles of the 

 type, common amongst the Syllidae, with an elongated 

 terminal appendage, bifid at the tip and beset with short 



Notes from the Leyden Museum, "Vol. XI. 



