76 ZOOLOGISCHE MEDEDEELTNGEN — DEEL IL 



The ventral bristles are provided with a beard of fine, slender pinnae, 

 separated by a large interval from the spine beneath them. The ventral 

 cirrus it slender, not extending beyond half the length of the neuropo- 

 dium. A dorsal felt occurs, that is covered with mud. There are 12 pairs 

 of transparent elytra, not overlapping each other in the median dorsal 

 line and leaving the middle of the dorsum bare. The ventral side of the 

 body is villose, covered with small papillae. The head is rounded, some- 

 what broader than long, with two large, globular eye-peduncles, without 

 pigment. The tentacle is wanting. The palps are very long, reaching to 

 the 12th segment. 



The largest specimen measures about 20 mm. ; the number of its seg- 

 ments amounts to 25. 



Genus Aphrogenia Kinberg '). 



This genus is characterised by the presence of sabre-like curved dorsal 

 bristles. The first representant of it in the Indo-pacific region {Aphroh. 

 margaritacea) was described by Augener from the Sea of South-West 

 Australia 2 ) ; for, as rightly stated by this author, Aphrog. dolichoceras 

 Hasw. 3 ) must belong to an other genus. 



Aphrogenia villosa n. sp. 



Siboga-expedition, Stat. 273, anchorage off Poeloe Jedan, east-coast of 

 Aroe-islands. 



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

 amounts to 30. The body dorsally has 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, much resembling those 

 of Aphrog. margaritacea. Each elytron 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 

 especially in the centre shows a yellow-grey pigment. Its surface like in 

 Hermione is finely, radially striated, whereas very minute papillae scat- 

 teredly occur. The large dorsal bristles are curved like a sabre and in 

 this regard agree with those of Aphrog. alba and margaritacea', 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 elytro- 



1) loc. cit. p. 6, PL ir, fig. 6. 



2) Die Fauna Siidwest-Australiens, Polychaeta, 1913, p. 93. 



3) A monograph of the Australian Aphroditea, p. 273, PI. VII, figs. 4—7. 



