200 " ENDEAVOUR " SCIENTIFIC RESULTS. 



Loc. Off Gabo Island, Victoria, 200 fathoms, with Polynoe 

 platycirrus, Physalidonotus laevis, and P. paucibranckiatus. 



Genus SCALISETOSUS, M'Intosh. 



SCALISETOSUS AUSTRALIENSIS, Sp. )WV. 



(Plate xliv., figs. 114-117.) 



A very poorly preserved fragment, deprived of its elytra, 

 most of the prostomial outgrowths, all its dorsal cirri, while 

 many of the parapodia are injured. It is pale in colour, 

 without any pigment. The 28 segments measure 10 mm. 

 in length, with a diameter of 2 mm. across the body, and 

 3-25 mm. over the parapodia. 



The prostomium (PI. xliv., fig. 114) consists of a pair of 

 oval lobes separated by a wide deep groove ; the anterior 

 margin is well marked, and the tentacles spring from below 

 it. Only the bases of these remain, the median rises at a 

 rather higher level than the laterals, and the tentaculophores 

 appear to be very short. The two pairs of eyes have a pale 

 brown colour. 



The elytrophores occur on the chsetigerous segments 

 1, 3, 4, 6, 8, etc. I cannot say where the change, if any, 

 occurs, owing to the damage in the hinder segments of the 

 fragment. 



Both the elytrophores and cirrophores overhang the 

 parapodia much more than is usual in the family, indeed, 

 they overhang the notopodia, which is a small lobe (PI. xliv., 

 fig. 115). The neuropodium has a long anterior pointed lip. 

 The ventral cirri are narrow filaments. 



The chgetae are colourless ; they are alike in form in both 

 lobes, but those in the dorsal lobe are much shorter. These 

 chsetse are quite characteristic of the genus (PL xliv., fig. 116) ; 

 at the point where the shaft commences to bear the pectinated 

 frills, it is distinctly enlarged, and bears a conspicuous single 

 large frill, which under a low power looks like a tooth, but 

 fine grains of mud are present in the cup formed by it. The 

 remaining frills have the appearance of a series of small 

 teeth. The apex is free, and in the dorsals simple, but in 

 many of the ventral chsetse there is a minute subapical tooth. 



The frills (PI. xliv., fig. 117) are very short and delicate, and 

 each has but little height, is very indistinct, and slopes down- 

 wards more abruptly than is usual in the family. 



