4i 



is short and thick, only somewhat tapering posteriorly, with a quadrangular cross-section 

 and a wrinkled skin, especially on the ventral side. lts length is about 15 mm., whereas its 

 greatest breadth measures 4111111.; the number of segments amounts to 31. The dorsal side 

 is dark brown, the ventral one paler, orange-coloured ; the branchiae are greenish with orange- 

 coloured tips, whereas the cirri and the antennae are of the last named colour. The bristles 

 are brilliant white. 



The head is strongly withdrawn, therefore not much is to be seen neither of the eyes 

 nor of the caruncle; this organ is emarginated anteriorly and from its notch a rather long 

 unpaired antenna emerges. The two antennae situated in front of it are of about the same 

 length, but those of the inferior pair are shorter. The mouth is bounded anteriorly by the 

 palpar area, longitudinally grooved in the middle, posteriorly by the 4 th segment, laterally by the 

 anterior three segments. The notopodia are separated by a great distance from the neuropodia 

 and the fïrst named bear much longer setae than the latter ones. The dorsal fascicle contains 

 some acute harpoon-shaped bristles with a row of narrow denticles on both sides (PI. X, fig. 22); 

 moreover there are several longer, more slender setae with a granular axis and a plain, curved, 

 tapering distal extremity. The ventral fascicle, besides some small spines with dilated tip (PI. X, 

 fig. 23), possesses only hook-shaped bristles like in Antphinome rostrata (Chall. PI. II A, fig. 10). 

 In a young specimen (with only 1 1 segments), found in the same glass-tube and probably 

 belonging to the present species, I observed in the ventral bristles a small spine beneath the 

 curved tip, like in the ventral hooks of Hippono'è (loc. cit. PI. UIA, fig. 17). The branchiae 

 consist of a dense tuft of branched filaments and commence on the third segment. The dorsal 

 cirri, consisting of a basal joint and a long distal part, are almost as long as the dorsal 

 bristles ; the ventral cirri extend only to half the length of the ventral setae. 



Upon the left side of the body (PI. X, fig. 21), somewhat behind the middle, a small 

 worm is visible, undoubtedly a young of the present species; it lies between the notopodia, 

 with its oral extremity directed to the middle of the dorsum, while its anal end is situated on 

 the lateral side of the adult one. It has a length of 4 1 /;, mm., and consists of 15 segments; 

 the notopodia are already furnished with some branchial filaments, the anterior of which are 

 situated on the third segment. It is nearly coloured like the adult worm, only its intersegmental 

 grooves have a paler hue and therefore the body looks as being marked with transverse bands. 

 This is the second example in the family of Amphinomidac that the adult worms take some 

 care of their offspring, for Augener 1 ) has pointed out, that the small animals already observed 

 by Baird 3 ) on the ventral side of /-/ipponoë-specïmens, but considered by him as parasites, 

 represent the young ones of this worm. Our species appears to be allied to Aviph. nitida, 

 described by Haswell from Cape Grenville s ). 



1) Zool. Anzeiger, Bd. XXXVI, 1910, p. 246. 



2) loc. cit. p. 240. 



3) Pioc. Linn. Soc. of N.S.Wales, III, 1879, p. 341. 



41 



SIBOGA-EXPEDITIE XXIV 'a. 



