lOO 



part of which the tentacle emerges with its basal joint ; its frontal margin is rounded, whereas 

 the lateral sides are somewhat prominent. There are two pairs of large eyes, situated laterally, 

 close to each other. The lateral antennae, which have a filiform distal part, are about twice as 

 long as the head; the tentacle is absent. The palps swollen in their basal part, filiform distally, 

 are nearly thrice as long as the head, smooth. Only a single pair of elytra is left, viz. on the 

 i7"> segment of the worm of Stat. 99 and on the fragment of Stat. i72;they(Pl. XXI, fig. 3) 

 are nearly rounded, translucent, with an eccentrical scar of attachment. Their exterior half shows 

 about twenty large, club-shaped papillae (PI. XXI, fig. 4), that are covered over their whole 

 surface with small tubercles, whereas on the tip some larger ones occur. The cirrophores are 

 situated in the line of the elytrophores ; no dorsal tubercles are present. 



In the parapodia the neuropodium is highly-developed, with an elongated, triangular 

 anterior lip, that contains the distal end of the acicula. Its fascicle consists of bristles, that have 

 the distal end separated from the shaft by a semilunar laciniated cusp and are provided with 

 a bifid tip; the ventral ones are serrated along both edges, whereas the dorsal bristles have 

 a number of laciniated fringes. The notopodium is rudimentary, with a short pointed lip, which 

 contains the acicula and a number of faintly bent, undivided setae with some laciniate fringes 

 alono- their edge. The dorsal cirrus with filiform distal part, is nearly as long as the notopodial 

 fascicle; the ventral cirrus does not extend much beyond half thelength of the neuropodium. 



Scalisetosus papilliferus is especially characterised by the large papillae of its elytra, for 

 most of the Scalisetosus-'~>^&d&^, hitherto described, have the elytra smooth ; 'm Sc. pellucidtisMM.^) 

 only they are provided with bell-shaped papillae with tactile hairs on the tip. 



5. Scalisetosus tentaculatus Horst. PI. XXI, figs. 5 — 7. 



Horst, Zool. Mededeel. R. Museum Nat. Historie, Leiden, vol. I, 1915, p. 18. 



Stat. 49a. 8° 23'. 5 Lat. S., 1 19°4'.6 Long. E. Sapeh Strait. Depth 69 M. i incomplete specimen. 

 Stat. 274. 5°28'.2 Lat. S., 134° 53^9 Long. E. East off Aru Islands. Depth 57 M. i specimen. 



An anterior fragment of a worm, measuring only 7 mm. and consisting of 20 segments, 

 was captured at Stat. 49^ and a complete specimen without elytra at Stat. 274. 



The prostomium has a deep incision, from which the tentacle arises, that is long and 

 slender, about twice as long as the lateral antennae. Palps smooth, tapering, nearly as long 

 as the lateral antennae, which have about thrice the length of the head. Eyes inconspicuous, 

 situated in front of the posterior margin of the prostomium. The elytra (PI. XXI, fig. 5) are 

 large, overlapping each other in the median dorsal line; they have an elliptical shape, with 

 the scar of attachment situated eccentrically and the exterior half of the surface covered with 

 small oval papillae. The parapodia have a dorsal cirrus, that is very long, extending beyond the 

 distal extremity of the neuropodial bristles; moreover their ventral cirrus is rather long, reaching 

 beyond the tip of the ventral lobe. The neuropodial lobe has an anterior lip, that is long^ 

 conical, surrounding the acicula; the notopodial lobe also is elongated,- cylindrical, but does not 



l) Die Boistenwümier, p. 105. 



56 



