Gaily Marine Laboralor>/j Si. Amlrewa. 2.') 



are few <uul minute, since in all probal)ility they have been 

 bloaclu'd l)y the spirit. The structure ot" the anterior and 

 jjostcrior liristlt-s and liooks at this stage correspond with 

 that of the adult. 



In another young example f(nuid under a stone at St. Peter 

 Port, Guenijicy, and which was ahout three-quarters of an 

 inch in length, the rellccted lamclke of the collar were of a 

 rich reddish-hrown 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 ihehssureof the collar, and ronndcfl 

 behind the anterior groove. The ventral surface is slightly 

 flattened and markeil by the median furrow from the tenth 

 scute backward. 



Amphicora fabricla, O. F. Miillcr, 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. The brauchiae are 

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

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

 quite pale. The pinnic are longest at the biise of the fila- 

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

 of the arrangement when 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 cylindricnl 

 tentacles, ciliated like the branchiae. A single vessel occurs 

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

 numerous palpoeils. 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., De St. Joseph) in length, cylindrical throughout 

 the greater part of its extent, then ta[)cred toward the tail. 

 The segments are thirteen in all, seven of which pertain 

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

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

 often flattened. The first or buccal jscjimcnt has two black 



