fascicle these appear some plumoiis setae, slender, lanceolate bristles, with hairy appendages 

 along their frontal side as hgiired pi. XIX, fig. io2 by Pruvot and Racovitza from Pol, 

 maxillosus (Pantli. Lacasil)\ they undoubtly represent the pencil-bristles of other genera and 

 therefore may be called setae pseudo-penicillatae. To begin with the 12'^ segment some translucent 

 branchial papillae become visible on the dorsal side of the parapodium ; also ventrally, at the 

 median side of the ventral cirrus the skin is somewhat dilated and translucent. 



2. Polyodontes atro-niarginatiis n. sp. PI. XXIX, Figs. 5 — 7. 



Stat. 19. 8° 44.5 Lat. S., 1 16° 2'.5 Long E. Bay of Labuan Tring, Lombok. Depth 18 — 27 M. 



I incomplete specimen. 

 Stat. 47. Bima Anchorage. Depth 13 — 31 ^L i inconiplete specimen. 

 Stat. 71. Makassar and surroundings- Depth up to 32 M. i incomplete specimen. 

 Stat. 162. Between Lóslos and Broken Islands, West oft" Salawatti. Depth iSM. 1 incomplete 



specimen. 

 Stat. 240. Banda Anchorage. Depth 9 — 45 M. i incomplete specimen. 

 Stat. 311. -Sapeh Bay, East coast of Sumbavva. Depth up to 36 M. i incomplete specimen. 



At the above-named stations six anterior fragments were found of a Polyodontes-species, 

 that, though closely alHed to the preceding, cannot be identified with it. The largest specimen 

 (from .Stat. 311) has a length of 55 mm. and a breadth of 9 '/^ mm. (without bristles) and consists 

 of 80 segments; the smallest one (from Stat. 162) measures only 22 mm. in length and 7 mm. in 

 breadth and has 36 segments. The bare median region of the dorsum has a brown colour and 

 moreover in the larger specimen shows dark transverse stripes, exactly over the intersegmental 

 grooves. The scales (PI. XXIX, fig. 6) are transverse elliptical and are provided at their exte- 

 rior margin , ontward from the scar of attachment, with a rectangular prolongation that forms a 

 kind of pouch. They are dotted with a black pigment, that covers the hypodermic areolae, 

 that occur here like as in other species; along the posterior and exterior border of the scales this 

 pig'ment is more accumulated and gets the appearance of a black limb. Also the distal part of the 

 parapodia is dotted with black. The anterior three pairs of elytra are round and reversed forward ; 

 in the largest specimen the third parapodium also shows a small elytron in stead of a dorsal cirrus, 

 whereby, in my opinion, anew the homology of elytron and dorsal cirrus is proved (see my paper : 

 Xotes Leyden Museum, \^ol. XXXV, p. i6i). The prostomium (PI. XXIX, fig. 5) is provided 

 with two long ommatophores, each hearing at their distal end a large eye, furnished with a 

 lens ; at a short distance of their base a pair of small sessile eyes are visible. Between them 

 the tentacle emerges, tapering distally, nearly as long as the eye-peduncles. The lateral antennae 

 reach a good deal beyond the distal end of the ommatophores. The proboscis, that was everted 

 in the smallest specimen, is dotted with a brown-violet pigment and bears at the entrance 

 six conical papillae on each side of the large median one ; tliey show a black spot near their 

 base. The median papillae are not very long ; the dorsal one is a trifle larger than that of the 

 ventral side and both emerge from a broad base. The palps, nearly twice as long as the tenta- 

 cular cirri, show two rows of brown spots and are provided with curved spinous papillae. The first 

 parapodium bears two tentacular cirri, tapering distally, the dorsal being somewhat shorter 

 than the ventral one ; the parapodium is provided with capillary bristles and has a papilliform 



89 



SIBOGA-F.XPEDITIE XXIV' i5. l8 



