342 C^ESICIRRUS NEGLECTUS. 



low, meeting in a definite angle posteriorly, and a lateral notch occurs on each side. 

 Numerous ocelli in a rather broad band in front of the mouth. Proboscis smooth. 

 Nuchal organs of moderate length, and separated by a low keel. 



Body typical in outline, somewhat slender. Anterior setigerous segments diminished 

 in length to the fifth, after which the sixth and seventh show a slight increase, the latter 

 having the feet in front of the posterior third. The eighth segment is longer, and the 

 feet are near the posterior border. The succeeding segments increase in length, the 

 sixteenth being the longest; then they diminish rapidly. The number of the setigerous 

 segments is sixteen, then follow three achsetous segments and a callus-shaped ring. 

 The anal cone is low, and the vent has faint, pointed elevations. On the ventral edge 

 is the long central cirrus, and there are three pairs of subulate cirri about half the 

 length of the central cirrus with shorter ones interposed. In an example kindly sent by 

 Mr. R. Southern most of the shorter cirri had bifid or trifid tips. The longer cirri were 

 subulate or clavate. 



Nephridia occur in setigerous segments 7 to 9, with openings beneath the hook- 

 rows. The cephalic plate and anterior segments have glands, a minute account of 

 their distribution being given by Arwidsson. 



The anterior bristles (Plate CX, figs. 15 and 15 a) have slight wings, but these 

 almost disappear in the posterior segments. A series of fine spikes or hairs is distinct 

 on those of the seventeenth segment (Plate CXI, fig. 5d). The distal fine spikes are not 

 readily seen, indeed none were visible in the preparations of the anterior feet, but they 

 were visible in a posterior foot, where Arwidsson apparently did not find them. They 

 are shorter than the smooth bristles. The points of the bristles increase in breadth on 

 the sixth setigerous segment and are distinct on the ninth, and they seem to vary in the 

 succeeding segment. 



The hooks of segments 1 to 3 are usually single and considerably modified, but 

 they are well-developed on the fourth and succeeding segments (Plate CXI, fig. be). 

 The great fang comes off at less than a right angle and is curved, whilst five teeth in 

 lateral view occur above it. A slight process for the gular bristles is situated just 

 beneath it, and the neck and shaft, which are separated by a distinct constriction, are 

 marked by parallel striae internally. The shaft is much curved. 



The foregoing description is mainly that of Arwidsson, since a specimen from 

 Mr. Southern only reached me as the MS. went to press. Careful search 1 was made at 

 the locality stated by Cunningham and Ramage, but no trace of the Maldanid could be 

 found, a change probably from increased pollution having taken place in this part of the 

 estuary of the Forth. A certain element of doubt thus remains concerning this species 

 and its relationship to other forms. 



Reproduction.— -Two females, taken on September 16th at Blacksod Bay, are fairly 

 full of eggs, which are still of different sizes (Arwidsson). 



Cunningham and Ramage (1888) found this form in tubes of fine sand, 200 or 300 



yards west of the Birnie Rocks in the Forth, buried to a depth of 6 to 8 in., the upper 



end being simple and open. They describe its colour as pinkish, paler toward the anterior 



1 For which I am much indebted to Mr. Eagle Clarke and the officials of the Royal Scottish 



Museum. 



