310 MR. CYRIL CROSSLAND ON THE [Feb. 16, 



111 this smallest specimen the gills begin at foot 21, and the 

 thirteen pairs present consist of one or two filaments, which 

 ai'e only as long as the dorsal cirrus ; in the two larger specimens 

 they begin at feet 15 and 17 and consist of three or four longer 

 filaments attached to a short rachis as in the adult. Apparent!}' 

 in correlation with the early appearance of the gills, the knife- 

 ended compound setfe are confined to a few of the anterior segments. 

 In the smallest example a single hoolced seta is present in the 

 eighth foot and by the twelfth has replaced all but two of the 

 former kind, though one knife-ended seta still exists in the twentieth 

 foot. In the larger fragments hooked seta3 appear at about 

 the eighteenth segment, and a few knife set^e continue in 

 deci'easing numbers for about twelve segments more, after which 

 only the former are present. The ordinary setse are all nearly 

 colourless, and in the smallest specimen the acicula and aciculai- 

 seta? are of a light brown tint. In the smallest the acicular setfe 

 begin at the sixteenth foot, in the larger at the thirtieth as against 

 the eightieth in those full-grown. Fig. 8, PI. XXI., shows these 

 seta?, h and c the two kinds of compound, a and d two shapes of 

 the acicular sette, and e the aciculum. Contrast PI. XXI. fig. 6. 



The character of the tube-fragments found and the state of tlie 

 ventral cirri show that the moclifications for the tubicolous mode 

 of life are not yet completed, and among these are to be reckoned 

 the latei' appearance of the gills and of the change in the setpe. 

 The long row of rudiments of gills in front of those which are of 

 a functionally useful size in the adult are doubtless vestiges of the 

 anterior gills of the J^oiing which atrophy when the worm attains 

 its full size and enters upon its peculiar tubicolous mode of life. 

 It is intei-esting to note that here, as in the case of Eunice inclica, 

 struct ui-al immaturity is no bar to sexual ripeness, since one of 

 these fiugments is loaded with large eggs. 



The empty tubes, described by Whitelegge as resembling those 

 of E. tibiana, bi-ought from Funafuti, most probably belonged to 

 this species, and are evidence of its wide distribution through the 

 Indo-Pacific area. 



Eunice murrayi McI. 



E. murrayi Mcintosh, ' Challengei' ' Reports, vol. xii. p. 288,. 

 pi. xxxix. figs. 7 & 8, pi. XX. figs. 19 & 20. 



Two large specimens, 6 mm. bi-oad ovei' all, from among coral 

 at lowest tide-level, Pungutiayu Islet, East Afiica ; two others, 

 very little smaller, from 10 fathoms in Wasin Harbour ; one minute 

 specimen, incomplete, dredged from 2 or 3 fathoms in Chuaka Bay, 

 Island of Zanzibar. 



From the Maldives are two large specimens from the reefs at 

 Hulule, Male Atoll, and Goidu Atoll. 



Speaking roughly, the species is like Eunice aniennatcij but with 

 the gills confined to the anterior segments, the other differences 

 between the two species, though occui'ring in every part, being- 

 inconspicuous. But in mode of life and appearance when alive, 

 the species is distinct from all others. The two specimens from 



