22 Pruf. M'liitosli's Notes from the 



short distance above the base and tlie others at irregnlar 

 distances. A considerable portion of the tip is alwajs 

 devoid of them. They are dense masses of blackish 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 approach the tip, where they end abruptly. 

 Their colour is brownisli vioh t in young forms, with twenty 

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

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

 the specks are situated near the middle of the ventral 

 filaments. 



The body is of morlerate length for a Sabella, 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-A^entral line being marked by the groove from the 

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

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

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

 somewhat ovoid papillee Avith 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 diffei'. 

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

 blunt cones. In this region the bristles are directed upward 

 and backward as conspicuous tufts, whilst the rows of hooks 

 stretch on rounded elevations between them and the ventral 

 scutes. The first segm.ent is Pused with the buccal, and beais 

 the first bristle-tnft. The segments are deeply cut ventrally 

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

 has two lunate dej)ressions, upon which the ventral lappets 

 of the collar apparently impinge, the glandular tissue having 

 been absorbed or arrested in develojjment on these areas. 

 The next ten scutes in the example from Plymouth are 

 undivided by the median line, though three show a white 

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

 region. The 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 sejaaration into two groups — a 

 longer dorsal row-, the long axis of which is neaily horizontal 

 or slightly oblique, and a mass of shorter bristles beneath 

 them. The upper bristles have very long, straight, striated 



* Aun. Sc. Xtit. S^ ser. xvii. p. 288. 



