's RIJKS MUSEUM VAN NATUURLIJKE HISTORIE — LEIDEN. 83 



the middle of the surface, where the two grooves are crossing each other, 

 another small area occurs, from which a minute, unpaired antenna arises. 

 The paired antennae are much longer, about as long as the cephalic lobe 

 and the palps are nearly of the same length. The anterior margin of 

 the head besides a large, rounded, frontal tubercle bears a cushion- 

 shaped appendage on each side of the palps. On the posterior half of the head 

 on each side a pair of eyes is situated, the anterior of which are the 

 largest. Of the 8 pairs of tentacular cirri only the basal joints are pre- 

 sent. Unfortunately the proboscis is not protruded, therefore nothing can 

 be stated about the jaws. The parapodia differ somewhat in shape from 

 those of Leocr. chinensis Kbg. l ) ; the neuropodium is more slender, 

 whereas the notopodium, that commences with the 4th parapodium, is 

 shorter and conical. In the base of the last one there occur two aciculae, 

 a larger and a smaller one; its capillary bristles are transversely striated, 

 but not serrulated. The compound, ventral setae are pale brown, with a 

 loDg, slender terminal piece, as usually bearing a secondary process 

 beneath the bifid tip. In the fascicle of the 6th parapodium a long bristle 

 was observed, much projecting beyond the other ones, with a shaft double 

 as long as in the ordinary setae and a terminal blade with slender ex- 

 tremity. The dorsal cirrus is rather short, only extending to the distal 

 extremity of the neuropodial bristle-fascicle, whereas the ventral cirrus 

 is nearly half as long; both cirri are smooth, not articulated. 



1) A common form in the Malay Archipelago, dredged hy the Siboga-expedition at several 

 localities. 



