22 Prof. M'Intosli's Notes from (Jic 



short distance above the base and the others at irregular 

 distances. A considerable portion of the tip is always 

 devoid of theiu. Tlu'v are dense masses of hhickish pigment 

 apparently enclosed in some cases in a capsule. The pinnae 

 (barbules, De St. Joseph) are short, and form a dense 

 double row along the inner edge of the filament, becoming 

 shorter as they a]>proach the tip, Avhcre they end abruptly. 

 Their cok)ur is brownish vioh t in young forms, uith twenty 

 branehia* in each fan, and a pair of black ovoid eyes occurs 

 on the dorsal filaments about a tliird from the end, whereas 

 tlie specks are situated near the middle of the ventral 

 filaments. 



The bodi/ is of moderate length for a SabeUa, varying 

 from 2 to 6 inches (13 cm. long by 1 cm. broad, De St. 

 Joseph), and the segments vary from eighty to ninety 

 or more. It is rounded dorsally and flattened ventrally, 

 the mid-ventral line being marked by the groove from the 

 posterior edge of the anterior region to the tail. The body 

 tapers from the posterior third (in spirit) to the tip of the 

 tail, at which the anus is, whilst beneath the tip are two 

 somewhat ovoid papillae with pigment-dots. The anterior 

 region has nine bristled segments, but the number, as 

 De St. Joseph shows *, varies much (e. y., from five to 

 eleven), and the numbers on the respective sides may differ. 

 The setigerous processes are large, and have the form of short 

 blunt cones. In this region the bristles are directed upward 

 and backward as consj)icaous tufts, whilst the rows of hooks 

 stretch on rounded elevations between them and the ventral 

 scutes. The first segment is fused with the buccal, and bears 

 the fii'st bristle-tuft. The segments are deeply cut ventrally 

 in this as in the succeeding region. The first ventral scute 

 lias two lunate depressions, upon which the ventral lappets 

 of the collar ap})arcntly impinge, the glandular tissue having 

 been absorhed or arrested in develoi)nient on these areas. 

 The next ten scutes in the exan)ple from Plymouth are 

 undivided by the median line, thouj^h three show a Avhite 

 stieak in the centre — two of these belonging to the posterior 

 region. Tlie scutes are continued to the posterior end as 

 elongated plates on each side of the median groove. The 

 bristles of the anterior region are characterized by their 

 golden hue and their distinct separation into two groups — a 

 longer dorsal row, the long axis of which is nearly liorizontal 

 or slightly oblique, and a mass of shorter bristles beneath 

 them. The u])per bristles have very long, straight, striated 



* Aun. Sc. Nat. S*' ser. xvii. y. -JhS. 



