[6 



the tip. Lateral dorsal cirrus, situated between the second and third grills, as long 

 ne, heavy, somewhat shorter. I >< n -^.i ] series of forked bristles h front ol 

 lian ;^ilN; ringent setae, of the type ol / athered in a median group. 



!th .ui undulated margin and an elevated, median keel, extending over I 



On the reef near Laiwui (Obi major) an EupArosyne-specimen was collected, that I firsl 



be identical with /•.'. M aster sii Hasw. from Darnley-island ing with it in several 



. f. i. the number of branchiae etc rhe oblong, oval body, strongly bent by the 



/ation in spirits, measures about 30 mm. in length, its breadth being 10 mm. The bare 



median field of the dorsum is somewhat narrower than its lateral parts, that are covered with 



branchiae, and measures abt. ut 2 l / s mm. in diameter; its surface is divided in a number of 



polygonal area's and shows on the middle of each segment a spot of dark pigment. The 



number of its segments amounts to 41. 



The caruncle, extending over five segments, lias an oblong oval shape, but suddenly 



narrower in the region of the eyes and like .1 wedgi I lobe of about a fourth 



its total length it pushes between the two anterior segments: it has an undulated margin 



and an elevated median keel. In front of the eyes a short, thick antenna is inserted, measuring 



only twice the diameter of the eyes and provided with a short terminal joint. In front ol the 



oral orifice two long, pyriform lol.es are visible, extending between the first, second and third 



ments; its posterior margin is bordered by a longitudinally folded, triangular lobe, lying in 



the middle of the ventral region of segments IV and V. 



I ach parapodium (PI. IV, lig. 4) carries a series of nine branchial arbuscles 

 with a short stout stem, directly dividing dichotomously after its origin, the numcrous branches 

 of which are not very long and elliptically expanded at the tip. The lateral dorsal cirrus is 

 situated between the second and third gills, haring about the same length as these ; the median 

 one is blunt and somewhat shorter. The doublé row of forked bristles (PI. IV, fïg. 5), placed 

 in front of the branchiae, does not reach farthcr than the fourth gill ; the longest of them 

 project a good deal beyond the branchiae, whereas the shortest ones are hardly as long as these. 

 The ringent setae (PI. VI, lig. 8), of the type of E. fo/iosa, are gathered in a median group; 

 they have a stout, blunt short limb, and the long one, with its inferior grooved part, bending 

 .■ver it, has only a small, plain superior extremity, triangular and somewhat directed backward. 

 The neuropodium has a rounded, auricular anterior lip and a fascicle of stout, bifurcated 

 bristles, the long limb of which measures about five times the short one (PI. IV, fig 6). 



As already stated above, I first thought our specimen to bc identical with E. Mastersii, 

 which is about of the same size (one inch), and presents also nine or ten ramose branchiae, 

 which form dendroidal masses, with slightly expanded terminal twigs. However Haswell's paper 

 , is not accompanied by any figure, which are yet indispensable especially for the Identi- 

 fication of the ringent setae: moreover his description contains some statements, that make the 

 identity of the species rather doubtful. F. i. he describes the terminal twigs to be phylloid, 

 a definition that certainly is not applicable to the branchiae of the Siboga-spccimen ; also the 

 proportion between the breadth and the length of E. Mastersii differs from that in our specimen. 



16 



