io8 



Stat. 240. Banda Anchorage. Depth 9 — 45 M. 11 specimens. 



Stat. 315. Anchorage east of Sailus Besar, Paternoster Islands. Depth up to 36 M. i incom- 

 plete specimen. 



In the neighbourhoüd of Banda 1 1 specimens of an Eu//ia/cncssa-species were collected, 

 thal much resemble L'. ocnlata^ according to the descriptions of Mc Intosh and Isuka, based 

 on worms, found in Bass Strait and near the coast of Japan. Xearly all the Siboga-specimens 

 are incomplete and miss the posterior body-region ; only a single one is complete. The middle 

 of the dorsum is bare, because the elytra are diverging, except those of the first pair, that 

 lie close to each other above the prostomium, almost entirely hiding it. Some of them are 

 blackish, others of a red colour, because the elytra are provided with a black or red pigment, 

 that extends especially along their posterior and median border and the scar of attachment; 

 the middle of the dorsum also shows that colour. The complete specimen has its posterior 

 ventral region marbled, except in the intersegmental grooves and a white median band, bor- 

 dered on each side by a dark line. The largest specimen has a length of 52 mm. and consists 

 of about 125 segments. 



The prostomium (PI. XXII, hg. ij is characterised by the enormous size of the eyes; 

 the anterior pair of them show a large semilunar pigment-area, whereas in the posterior pair 

 this area is roundish. There are three small, conical antennae, tvvo at the frontal margin and a 

 median one arising at some distance behind them from the middle of the dorsum ofthehead; 

 they have a conspicuous distal joint, conical shaped. In Thalenessa digitata, according to the 

 figures and the description of Mc Intosh i) and Willey") the three antennae arise from 

 the frontal margin of the head, like as in Th. gracilis Fischli') and EutJi. insignis Ehl. '), 

 whereas in Th. djióoutiensis') the lateral are situated somewhat behind the the middle one. The 

 palps are very long, smooth and tapering distally ; bent downward and backward they reach 

 the tenth segment. The parapodium of the buccal segment shows an acicula only and is pro- 

 vided along the internal margin of its basal part with a narrow, convex lamella ; of both ten- 

 tacular cirri the dorsal is somewhat shorter than the ventral one. The second segment bears 

 the first pair of elytra ; they are cordiform, with a smooth margin and their broadest part 

 directed frontward, whereas the scar of attachment is situated somewhat eccentrical. 



The scales of the fourth segment are furnished along their internal border with six 

 dichotomously branched papillae ; more hindwards the scales increase in size, the number of papillae 

 amount to ten and their anterior margin becomes more concave, giving to the posterior scales a 

 reniform appearance. The third parapodium bears a dorsal cirrus, that consists of a short basal 

 part (cirrophore), and a terminal joint, about twice and a half as long as the former. On the dorsum 

 of the parapodium in this region there are two inversed conical ctenidia. The notopodium is 

 surrounded by a cup-shaped lamella, divided by a fissure in two halves ; the posterior half bears 



i) Loc. cit. p. 140; pi. XXII, fig. 2. 



2) Loc. cit. p. 260; PI. II, fig. 52. 



3) Loc. cit. p. 101; PL IV, figs. 5 and 7. Fig. 24, PL V, of this paper, repvesenting a parapodium, is placed upside down; 

 ihe organ, indicated here as a ventral cirrus, is presumal)ly a branchial appendix, whereas the real venlral cirrus is named dorsal cirrus. 



4) Ehlers, Bodens. Annel. p. 52, PI. I, fig. ii. 



5) Loc. cit. pi. VII, fig. 114. 



64 



