Gatty Marine Lahoratory , St. Andrews. 25 



are few and minute, since in all probability they have been 

 bleached by the spirit. The structure of the anterior and 

 posterior bristles and hooks at this stage correspond with 

 that of the adult. 



In another young example found under a stone at St. Peter 

 Port, Guerns^ey, and which was about three-quarters of an 

 inch in length, the reflected lamellae of the collar were of a 

 rich reddish-brown colour. The anterior region consists of 

 ten bristled segments and nine long scutes, and the region 

 which follows appears to have more than thirty segments. 

 The body is comparatively short, grooved on the dorsum for 

 a short distance behind the ftssure of the collar, and rounded 

 behind the anterior groove. The ventral surface is slightly 

 flattened and marked by the median furrow from the tenth 

 scute backward. 



Amphicora fabricia, O. F. Miiller, the eighth form, is 

 abundant near low-water mark and amongst roots of sea- 

 weeds. The cephalic region has a projecting, broadly conical, 

 ventral median process, and dorsally the margin presents a 

 median notch behind a small conical process connected with 

 the mouth. There is thus an indication of a collar, and it 

 and the next segment are narrower than those which succeed. 

 Two eyes are situated a little behind the anterior border, 

 and beneath are two pale red masses. In front of these, at 

 the base of the tentacles, are two deep red spots — apparently 

 in connection with the blood-vessels. Tlie branchiae are 

 three in number on each side — that is, the dense series of 

 pinnae arise from three main stems on each side, and all are 

 quite pale. The pinnae are longest at the base of the fila- 

 ments and shorter toward the tip, so that the general effect 

 of the arrangement w hen the fan is closed is to have a fairly 

 even series at the tip. They are ciliated internally. Intern- 

 ally at their base are two short and nearly cylindrical 

 tentacles, ciliated like the branchiae. A single vessel occurs 

 in each pinna in the line of the cilia, and the surface has 

 numerous palpocils. Moreover, at the base of the branchiae 

 are two vascular enlargements, which have been termed 

 " hearts.'' 



The body is rather more than an eighth of an inch 

 (1-2 mm., JJe St. Joseph) in length, cylindrical throughout 

 the greater part of its extent, then tapered toward the tail. 

 The segments are thirteen in all, seven of which pertain 

 to the anterior and six to the posterior region. It is 

 more or less rounded in the preparation, but in life it is 

 often flattened. The first or buccal segment has two black 



