Arwidsson — On some Irish Maldanidae. 22 1 



however, in a niunber of individuals, of the region round the orifices of the 

 nephridia (as always on the eighth setigerous segment, fig. 3). The hinder part 

 of the segment is free underneath, with the exception of sparse glands on the 

 ventral nerve-cord, hut the upper side is covered pretty evenly with rather 

 dense glands (fig. 6). Straight behind the topmost part of the row of uncini 

 these glands are somewhat more powerful; and this string of glands continues 

 into the eighth setigerous segment, which otherwise in its anterior part 

 possesses only some scattered glands in the middle of the dorsal side, faintly 

 marked ones along the ventral nerve-cord, and a number of scattered ones in 

 the neighbourhood of this last. From the middle and to the setae the same 

 segment is surrounded by a ring of pretty dense glands, which, however, are 

 rather faintly marked in comparison with the glandular rings of the preceding 

 segments. In front of the upper uncini there are a number of glands that are 

 more strongly marked ; in other words, a trail of glands seems here to go 

 between the seventh and the eighth setigerous segments. Further, there are 

 on the eighth setigerous segment a number of glands in a triangle behind the 

 parapodia, in the same way as in the seventh setigerous segment, and at least 

 the ninth and tenth setigerous segments, whilst further back this group 

 diminishes more and more. In addition, there are on the posterior part of 

 the segment in the larger individuals, a number of delicate dispersed glands, 

 as is also the case on the following segment. The glands of the ventral 

 nerve-cord, which proceed over the glandular band in front of the parapodia, 

 are slightly interrupted immediately behind the same band, but afterwards 

 continue posteriorly. On the following segment these glands form narrow 

 but powerful bands along the ventral nerve-cord ; they diminish abruptly in 

 the fifteenth setigerous segment, and shortly afterwards disappear altogether. 

 From the ninth to the seventeenth setigerous segment at least there is a spot 

 without glands on the ventral nerve-cord immediately in front of the uncini. 

 In the larger individuals, moreover, there is to be seen, on the eighth to the 

 twelfth (or thirteenth ?) setigerous segment, a fine glandular streak running 

 between the somewhat extended upper point of the collection of glands behind 

 the parapodia and the next parapodia behind. The glands in front of and 

 behind the parapodia join over the capillary setae on either side ; and these 

 glands further join by means of bridges transversely over the dorsal from 

 the fourteenth or the fifteenth setigerous segment ; these bridges increase 

 backwards as far as the eighteenth setigerous segment, inclusive, and there- 

 after diminish; but they are nevertheless still visible on the three achaetous 

 segments (figs. 8 and 9). Then follow fairly strong glands on the callus- 

 shaped ring, and also on the outside of the cup-shaped section (with the 

 exception of the posterior under part), and of the large cirri. In the larger 



