I04 



3- Polynoé 7iigro-punctaia Horst. PI. XXI, figs. 15 17. 



Horst, Zool. Mededeel. R. Museum Nat. Historie, Leiden, vol. I, 191 5, p. 20. 

 Stat. 231. Ambon Anchorage. Reef. i specimen. 



At this Station a small, slender Polynoid-worm was captured, characterised by a nice colo- 

 ration and measuring 8 mm. in length ; perhaps it is a young worm. The head (PI. XXI, fig. 15) 

 is dotted with black, interriipted by a white median groove and a white ring around the eyes ; 

 also the dorsum of the body is marked with black spots, interrupted by a curved transverse 

 line, that divides the dorsal area in a narrow anterior and a broad posterior field and termi- 

 nates laterally on the elytrophores or the tubercula dorsalia. The head, nearly as long as 

 broad, is divided by a broad median groove into two oval halves, each provided with a con- 

 spicuous frontal peak. The tentacle consists of a short, stout, basal part and a slender, distal 

 joint, somewhat longer than the head; the lateral antennae are short, conical, with a filiform 

 tip, about a fourth of the length of the tentacle. Of the palps only the left is present ; it is 

 stout, conical, not quite as long as the tentacle. Of the tentacular cirri the dorsal is longer 

 than the ventral one, and nearly as long as the tentacle. The elytra are all wanting, but pre- 

 sumably there have been 20 pairs of them; the posterior scales are not situated as usually, 

 for the 15"' pair, in stead of on segment XXXII, is placed on segment XXXI, the ló'^^ on S. 

 XXXIV, the 17"^ on S. XXXVI, the iS'^ on S. XXXVIII, the 19'h on S. XL and the 20'^ 

 pair on segment XLII. The neuropodial branch of the parapodia has an elongated conical lobe, 

 enclosing the acicula ; its bristles (PI. XXI, fig. 17) are slender, with a well-marked hook at 

 the tip and a small secondary tooth below it, whereas the dilat'ed subterminal part is provided 

 with laciniated fringes. The notopodium also is provided with a pointed lobe, not so long as 

 the neuropodial one; its setae (PI. XXI, fig. 16) are slightly curved, serrated. The dorsal cirri 

 are rather long, extending beyond the distal e.vtremity of the neuropodial fascicle ; the ventral 

 cirri are stout, but do not reach the distal end of the feet. 



4. Polynoé (Hemilepidia) versluysi Horst. PI. XXI, figs. 18 and 19. 



Horst, Zool. Mededeel. R. Museum Nat. Historie, Leiden, vol. \, 191 5, p. 19. 



Stat. 251. 5°28'.4 Lat. S., 132° o'. 2 Long. E. South oft' Kur Island. Depth 204 M. 4 specimens. 

 Stat. 253. 5°48'.2 Lat. S., i32°i3'Long.E. South oft" Taam Island. Depth 304 M. 8 specimens. 



Versluys met with a Pol\noid-worm, commensall)- living on Primnoidae {^ThotiarcUa hilgen- 

 dorfi Stud.) ; it is characterised by its long dorsal cirri and its elytra, that are restricted to the 

 anterior half of the body. However some of the specimens of Stat. 253 were presumably found 

 in free state. The largest specimen measures about 25 mm. in length; it consists of 65 seg- 

 ments. They are of a dark-brown colour in the median dorsal and ventral line. The head is 

 divided by a median dorsal groove in two halves ; between them the basal part of a tentacle 

 arises, that bears a long and slender distal joint, reaching till on the 5"' segment. The lateral 

 antennae are hardly as long as the head; the palpi, about tvvice as long, are rather stout at 

 the base, tapering distally, smooth. There are two pairs of large eyes, the posterior one being 



60 



