which is formed by th<- frontal margin of the segment, whereas the tip 



from th<- middle of the base of the triangle ;i line is running to rte lateral 



thus th<- triangular field in three smaller areas, an apical and two basal ones. A 



itudinal ■ runs over the middle "t" ih<- ventral side. ' 1 1 1 * - dors, il side is colourless 



in »w, violet band around the notopodium and a violet stripe over the middle of 



■\ cirrus of the anterior fivi ients; the ventral si. Ie is buff-coloured, wh( 



palps have a dusky hue lik.- the horizontal plate of the caruncle. Hie caruncle extends till 



egment; its horizontal plate is furnished on each side with 16 to 17 folds. The 



unpaired antenna is short, measuring about a third of the length of the caruncle. The mouth 



seems to be limit. -.1 by the .(' h segment, that shows a couple of median, longitudinal folds. 



branchiae commence on the 5 l!l segment; thej are composed of three main si. -nis, th.it 



branching in several filaments. The accessory cirri of the anterior five segments are longer 



than those of the following ones, that have nearly the same length as the branchiae. The anus 



is situated <>n the anterior part of segment 23, upon the top of a papilla. 



Th« al setae are greenish, the ventral ones opalescent. Each dorsal bristle (PI. IX, 



is nearly straight, stouter than in the foregoing species, but the short limb relatively 

 smaller, measuring about a fourth to a sixth of the long one; the axia] canal of its shaft is 

 narrow, granulated beneath the bifurcation. Each ventral bristle (PI. IX, fig. 5) with a rather 

 wide axial canal, divided on a short distance beneath the fork in two branches, that are 

 somewhat inflated in the middle; its long limb somewhal bent, without serrulations, the short 

 limb hardly a fourth of the long on.-. In the first segment the bristles have the long limb more 

 divergent, with tour faint denticulations. 



The smal' I ol the specimens examined by myself in iXSó 1 ) (that from Amboina, 

 1 probably belongs to this species and was uncorrectly identified with N. crinaia. for 



in this species the anal opening is situated on the posterior part of segment 21 according to 

 Ehlers, <t on the intersegmental groove 31 / M , according to Grube. 



These worms could not be identified with one of the two Notopygo j-species, hitherto 

 mentioned from the Malay Archipelago. In Notop. maculata Kinb., that has the anus also situated 

 in segment 2.;. the caruncle shows according to Grube a much smaller number of folds; by 

 \1 •.■ ix and Dehorne 9 ) unfortunately nothing is mentioned about this species but its habitat: 

 Amboina. As to Notop. labiatus Mc Int., the situation of the anus in this species is unknown, 

 and the ventral bristles are described as serrulated. 



;. >Notopygos Rayneri Baird). 

 ione Rayneri 



Bai '-'t. p. 226, PI. IV. and /'. 



Stat. .;.'. ~ : ;. S., m, Long. E. 1 lores-Sea. Surface. 2 specimens. 



The length of the body is ;: mm.; the number of segments amounts to 30. The ventral 



1 1 68. 



28 



