2 9 



side is buff, with a pale median band limited laterally by a dark line ; the dorsal side is brown 

 violet with a number of white lines crossing each other in various directions, except on the 

 anterior part of segment 23, that bears the anal papilla and on the posterior segments, where it 

 more and more becomes obliterated. A dark band runs around the base of the notopodial fascicle 

 and also the main stem of the branchiae and the basal part of the dorsal cirri are dark coloured. 

 The branchial cirri with a dark line and the horizontal plate of the caruncle with a dark hue. 

 The caruncle reaches to the y th segment and is furnished on each side with about 20 folds ; 

 the median antenna measures about half the length of the caruncle. The branchiae commence 

 on segment 5 ; they consist of two main sterns, from which the filaments are emerging laterally. 

 The ventral bristles have a yellow tip ; their axial canal is wide, granular, with a short isthmus 

 beneath the fork. Their short limb measures about a fourth of the long one, that is smooth. 

 The dorsal bristles are more straight, covered with a microscopic shagreen beneath the bifurcation. 

 In the anterior segment the longest limb of the bristles is denticulated, more divergent and 

 six times longer than the short one. The anus is situated on the anterior part of segment 23, 

 upon a small papilla. 



At the above-named station two Notqpygos-specimens were collected, one well preserved, 

 the other distorted and discoloured ; the first specimen much agrees with Baird's Notop. (Lirione) 

 rayneri from the reefs off the north-east-coast of Australia. Baird however mentions, that the 

 anus lies on the 2 2 d segment, whereas in the Siboga-worm it is situated on the succeeding 

 one; perhaps he made a mistake in counting the segments, what may happen very easily. 



4. Notopygos cirratus Horst. PI. IX, figs. 6 and 7. 



Horst, loc. cit. Vol. XXXIII, p. 246. 



Stat. 23. 8°48'.S Lat. S., ii5°4o' Long. E. Lombok-Strait. Surface. 1 specimen. 

 Stat. 99. Anchorage off North-Ubian. Sulu-Archipelago. 2 specimens. 



A slender worm, rather tapering towards the anal extrem'ity. The largest specimen 

 measures iS 1 /.-. mm. in length, the number of its segments amounting to 28; the smallest 

 specimen has only a length of 10 mm. The ground-colour is leady grey; a dark bancl runs 

 around the base of the notopodium and the basal joint of the dorsal cirri is violet. The elliptical 

 palps are of a dark hue. A shallow groove runs over the median ventral line. The anterior 

 part of the dorsal side of each segment is divicled in three areas, nearly as in Notop. sibogae. 

 The caruncle extends to segment 5 and is furnished on each side with 1 1 folds. The median 

 antenna is very short, about a fifth of the length of the caruncle. The anal opening is situated 

 upon a papilla in the intersegmental groove 23 / 24 . This species is characterized by the length 

 of its accessory cirri, that are much longer and thicker than the branchial filaments and extend 

 to the middle of the dorsum. The branchiae commence on segment 5. 



The ventral bristles (PI. IX, fig. 6) have their long limb somewhat divergent, three times 

 longer than the short one and furnished with a couple of conspicuous denticles ; the axial canal 

 of the shaft is wide and forms after dividing a short peninsula beneath the fork. The dorsal 

 setae (PI. IX, fig. 7) much resemble the ventral ones, but their long limb usually has only a 



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