534 Prof. M'lntosh's Notes from the 



is less expanded. The cavity of the collar, which, by the 

 approximation of the dorsal flaps, assumes the shape of a 

 funnel, leads to the mouth and is tinted brown, with a 

 tendency to madder-brown near the oral aperture. It doubt- 

 less subserves important functions in alimentation. At its 

 outer edge dorsally, and close to the first foot, springs on 

 each side the large subulate tentacle, which in the preparations 

 is grooved on its inner surface and shows crenations along 

 the groove. Thus the organ resembles a palp, though 

 apparently occupying a different position. In life it is capable 

 of considerable elongation, and occasionally presents a coil 

 or two towards the tip. At its base externally is a trans- 

 versely elongated black pigment-speck — the eye, — which 

 occupies a pit at the base of the collar and between it and the 

 base of the tentacle. In some the black pigment-specks are 

 separately arranged in a transverse row. 



Closely following the buccal segment are the feet and 

 other parts of the region, which has 9 segments in almost 

 all the northern examples. In two specimens from Naples 

 one had 10 on both sides, and the other 10 on the right 

 and 11 on the left. Considerable variability, however, is 

 known to exist in the common species, which may have only 

 8 bristled segments in this region. The feet are uni- 

 ramous with the exception of the ninth. Whilst the dorsal 

 surface is distinguished by its narrow median grooved 

 band which is continued on the tenth segment, the ventral 

 surface forms a large, convex, glandular, shield-like area — 

 somewhat resembling that in Sabella, — and in the Neapolitan 

 examples the area is more definitely outlined, probably from 

 the method of preparation. 



The next or middle region consists of 5 segments, 

 though the first appears to pertain as much to the anterior 

 region. This (first) segment has dorsally the median grooved 

 band, which is of the same diameter as in front, but at the 

 posterior edge of the wings it diminishes and is continued 

 thereafter as an undivided smooth band. It is in this region, 

 viz. in the eleventh segment, that the cylindrical fsecal 

 masses first appear, so that they may be formed in front of 

 it. The inner surface of the gut is here thrown into a com- 

 plex series of folds or large villi. 



The posterior region has 22 or 23 strongly marked 

 segments, each of which has a prominent dorsal division 

 of the foot formed on the plan of the great wings of the 

 tenth segment, viz., a large fleshy lobe somewhat tapered 

 distally and enclosing a series of bristles of the type seen 

 in the tenth bristled segment, tapered at both ends but 



