86 



diameter, whereas in a specimen of Lepidasth. affinis, broad 3 mm. (without bristles), the ely- 

 tron measures 17, mm. in breadth. hi the anterior segments the dorsal cirrus is very long, 

 extending to the extremity of the bristle-fascicle ; more posteriorly they become somewhat 

 shorter. The antennae of our specimens are much shorter than those in Lepidasth. elegans 

 from Zanzibar; they are nearly as long as the head, with filiform tip and dilated beneath it. 

 The palps are only a trille longer than the antennae, with an abruptly tapering tip. The eyes 

 are indistinct, situated laterally. The body is marbled with blackish pigment, with several white 



transverse spots. 



The complete specimen measures about 40 mm. in length ; it has nearly 1 10 segments. 



2. Lepidasthcnia microlepis Potts. PI. XIX, fig. 9. 



POTTS, loc. cit. p. 343, PI. 19, fig. 17; PI. 21, fig. 52. 

 Stat. 60. Haingsisi, Samau Island. Reef. i specimen. 



Length 20 mm., breadth (with setae) sVa mm.; 45 segments, 19 pairs of elytra. 



This species is characterised by the rudimentary feature of its elytra, only just capping 

 the elytrophores, with e.xception of the first pair, that cover the head; they are edged with 

 a chocolate pigment, that extends over their underside. 



The dorsal cirri have a rather long, conical cirrophore, hearing a distal joint of nearly 

 the same length. That the bifurcated type of setae is only to be found among the inferior 

 setae of the 7'^^ segment, as mentioned by Potts, could not be confirmed, for 1 saw already 

 a bristle, having this character, in the dorsal part of the fascicle of the 6«ii segment. This spe- 

 cies is first mentioned by Potts from the Maldives. 



3. Lepidasthenia sibogae Horst. PI. XVI, figs. i — 4. 



Horst, Notes from the Lcyden Museum, Vol. XXXV, 1912/13, p. 161. 



Stat. 282. 8°25'.2 Lat. S., 127° 18.4 Long. E. Ofil" the North East point of Timor. Depth 27— 



54 M. I specimen. 

 Stat. 306. 8° 27' Lat. S., 122° 54.5 Long. E. Lobetobi Strait. Depth 247 M. i incomplete 



specimen. 



At the above-named Stations a Polynoid-worm was caught, that is characterised not 

 only by the singular shape of its elytra, but also by the abnormal manner of their attach- 

 ment. The specimen of Stat. 282 measures 32 mm. in length and consists of 67 segments; 

 it is colourless, dorsally transversely folded, and has its greatest breadth in the anterior third 

 of its length, whereas posteriorly it becomes gradually narrower. The posterior fragment f_om 

 Stat. 306, consisting of 22 segments, is not quite colourless, but each of its segments shows 

 on the dorsum two narrow, brown transverse bands, one behind the anterior margin and an 

 other one in front of the posterior border. The head (PI. XVI, fig. i) is somewhat heart-shaped, 

 having a deep incision in the middle of its frontal margin, from which the tentacle arises, whereas 

 the paired antennae are inserted on its lateral corners ; they are all smooth, with a faint 

 subterminal dilatation and have about the same length viz. two thirds of the length of the palps. 



42 



