BY J. J. FLETCHER, M.A., B.SC. 567 



of it. The male pores are on segment xviii ; their position is 

 determinable on a iirst examination only by dissection, as there 

 are three or four pairs of pores of accessory glands lying imme- 

 diately in front of them, and three pairs just behind them, and 

 there is but little in the appearance of any one pair of them to 

 distinguish them particularly as the male pores. Of these acces- 

 sory gland pores, which are just external to or about in line 

 with the second rows of seta? on each side, the first pair are on 

 xvi, the second and third pairs on xvn, and a pair on xviii 

 just in front of and external to the male pores, and on each of the 

 three segments following it ; sometimes there are even eight pairs 

 of pores ; and frequently there is one pore more on one side than 

 on the other. The ventral portions of the annuli carrying the 

 pores are slightly thickened, the pores being situated on slight 

 elevations of these (" copulatory papillae"). They are the apertures 

 of glandular pouches whose bases are seen, when the worm is 

 dissected, as successive pairs of hemispherical eminences situated 

 on either side of the nerve cord, and beneath the prostates. 

 Tvvo specimens without clitella showed none. 



The apertures of the oviducts are on xiv as in P. australis, but 

 not quite so close to each other. The apertures of the spermathecas 

 are just behind the grooves between vn and viii, and viii and ix, 

 and on the anterior margins of the two latter segments, just 

 dorsad of the line of the innermost rows of seta?. Nephridiopores 

 are quite indistinguishable in my specimens. 



The setae are simple /-shaped and in no way remarkable, though 

 their arrangement is somewhat peculiar. Those of each segment 

 are situated on a median ridge, not however so conspicuous as is 

 usual in perichaete worms, nor do they form complete circles. The 

 setae are less conspicuous on the preclitellar segments. Behind 

 these there is a median ventral region about 2 mm. wide in an 

 ordinary specimen, devoid of setae, and bounded on either side by 

 a straight longitudinal row of them. External to each of these 

 rows and at a distance of about 1 mm. from them is a parallel 

 row. After these the remaining rows of which there are about 

 16 altogether, cease to preserve any regularity, becoming sinuous 



