65 



fïg. 8) are golden-yellow, slender, almost straight, only slightly curved in tlieir inferior part; 

 tliey liave an acute apex, and are furnislied over their total lengtli with spinous serrations. 

 These serrations are distally rather large, but inferiorly they are decreasing in length ; appa- 

 rently lying in a single line, they are actually situated on two rows, lying next to each 

 other. This species possesses a conspicuous dorsal feit, consisting of fine articulated threads. 

 The neuropodial bristles have a bifurcated apex, with two blunt cusps fPl. XIV, fig. 9). 



Genus Aphrogenia Kinberg '). 

 Characterized by the presence of sabre-like curved dorsal bristles. X'entral setae bifurcated. 



The fir.st representant of this genus in the Indo-Pacific region was described by Aügenkr 

 froni the .sea of South West Australia-); for, as rightly stated by this author, Aphrog. dolicho- 

 ccras Hasw.^) must belong to an other genus. 



I. Apkrogeuia villosa Horst. PI. XIV, hgs. 10 — 12. 



Horst, Zool. Mededeel. R. Museum Nat. Historie, Leiden, vol. II, 19 16, p. ■]6. 



Stat. 2-ji. Anchorage off Pulu Jedan, East coast of Aru Islands. Depth 13 M. i specimen. 



The length of the worm is about 12 mm.; the number of its segments amounts to 30. 



Dorsally the body is of a grey-brown colour, with a faint nacreous gloss; its ventral side 

 shows a row of black spots on each side of the median line. There are 13 pairs of elytra ; 

 they much resemble those of AphroQ-. inargaritacea Aug. Each elytron (PI. XIV, hg. 10) 

 is rounded rhomboidal, somewhat pointed at its median side, laterally provided with a slight 

 concavity next to the place of attachment; it is surrounded by a colourless margin and espe- 

 ciallv in the centre shows a yellow-grey pigment. Its surface like in Herinione is finely, radi- 

 ally striated, whereas very minute papillae scatteredly occur. The large dorsal bristles (PI. XIV, 

 fig. 1 1) are curved like a sabre and in this regard agree with those of Aphrog. alba and niar- 

 garitacea-^ however their apex is surrounded by a crown of short villi, whereas their shaft 

 is longitudinally striated and shows numerous transversal ridges, extending only over a part 

 of the periphery of the bristle. In the elytrophore-segments these bristles are much longer than 

 in the cirriphore-ones and arch over the dorsum. The ventral bristles (PI. XIV, fig. 12) are 

 brown-coloured, simply bifurcated, without accessory teeth. The dorsal cirri are very long, with 

 a clavate terminal joint; however the ventral cirri are short, with a clavate tip, hardly reaching 

 to the extremity of the foot. The head is oval, somewhat broader than long, with two con- 

 spicuous eye-stalks, provided with black pigment-spots. Betvveen them a slender tentacle arises, 

 4 to 5 times as long as the head, provided with a clavate distal joint. The palps are not 

 very long, tapering distally. 



1) Loc. cit. p. 6. 



2) I,oc. cit. p. 93, PI. II. figs. I '^w\ 2. 



3) A monograph of the .-^ustialian .\phroclitea : Proc. Linn. Soc. Vol. 7. p. 273, PI. V'II, tigs. 4 — 7. 



19 



