i7 



12. Euphrosyne maculata Horst. PI. IV, fig. 7; PI. V, figs. 5 — 7; PI. VI, fig. 9. 



Horst, loc. cit. p. 214. 



Stat. 296. Noimini-bay, South-coast of Timor. 1 specimen. 



A slender, pelagic Annelid, measuring 25 mm. in length and 7 mm. in breadth. Each 

 segment carrying twelve pairs of ramose branchiae, with a spot of black pigment on their 

 stem and with filaments that are not expanded at the tip. The lateral dorsal cirrus situated 

 between the second and third gill. A series of dorsal bristles in front of the ten median branchiae; 

 ringent setae of the type of E. foliosa. The ventral bristles partly slender and elongate. Caruncle 

 extending till segment V. 



A pelagic Annelid of moderate size, with a slender body, measuring 25 mm. in length 

 and 7 mm. in breadth. The number of its segments amounts to 40. The bare medio-dorsal 

 field has a diameter of i 1 /, mm.; it is irregularly wrinkled, with a lozenge-shaped area in the 

 micldle, especially obvious in the posterior half of the body. lts ventral side shows densely 

 crowded, undulated longitudinal grooves, except on a narrow mesial band. The bristles are of a 

 white colour. 



The caruncle (PI. IV, fig. 7) is oblong and extends to the middle of the fifth segment; 

 its posterior half is broader and consists of two lateral lobes and a median, elevated keel, 

 reaching the anterior margin of segment VI. Along the base of this keel, on both sides, there 

 is a band of black pigment. The caruncle carries at its dorsal and ventral sides a pair of rather 

 large eyes. The median tentacle, arising between the dorsal eyes, is furnished with a short 

 terminal joint and measures but one fourth of the total length of the caruncle; the ventral 

 eyes are flanked on each side by a short antenna. 



Each parapodium (PI. V, fig. 5) is provided with twelve branchial arbuscles; 

 they consist of a short, main stem, that is marked with a black spot and dichotomously 

 divided into numerous branches, which are not dilated at the tip. The lateral cirrus is situated 

 between the second and third branchiae and is only a trifie shorter than these; the median 

 cirrus, though contracted, appears to be somewhat shorter and carries also a black spot 

 like the gills do. In front of the ten median branchiae a row of forked bristles (PI. V, fig. 6) 

 projects, most of these shorter than, some as long as the branchiae; their longest limb is 

 impregnated with calcium carbonate and shows longitudinal stripes. Among them are some 

 ringent setae (PI. VI, fig. 9) of the type of E. foliosa, with a slender fork, the longest limb 

 of which is not strongly curved. 



The neuropodium has an auricular anterior lip and is provided with a rather short 

 ventral cirrus. Its fascicle contains three kinds of bifurcated bristles, a : (PI. V, fig. ja) short, 

 stout ones, in which the short limb of the fork is only represented by a spur ; 6 : (PI. V, fig. jb) 

 longer ones, that have the long faintly curved limb three to five times longer than the short 

 one; c: (PI. V, fig. je) slender, elongated bristles, as long as the distance between the neuro- 

 podium and the ventral mesial line, with their longest limb nearly straight, five to six times 

 longer than the short one. 



17 



S1BOGA-EXPEDITIE XXIV 1 a. 3 



