42 Prof. ^I'lutosli's Notes from the 



Avliicli diaiinisli as they go outward. A broader ring, tlie 

 second body-segmeutj wliich bears the branchia3 dorsally, then 

 follows, the central region of which is likewise marked oft' by 

 two furrows from the hiteral regions. This ring is partly 

 overlapped by the broad glandular belt, which stretches from 

 side to side of the next segment and chisps the setigerous 

 process at each side. Four similar ventral belts follow, dimin- 

 ishing as they go, and then the succeeding belts are narrow^ 

 separated by increasing breadths of non-glandular tissue. 

 Further^ an almond-shaped area beneath each setigerous 

 })rocess is dift'erentiated, and on this the hooks appear on 

 the sixth bristled segment, and thereafter it becomes the 

 uncinigerous process. 



The branchiae arise from the second and third segments by 

 short, somewhat bulky, and Huted stems, which are flattened 

 antero-posteriorly. Tiie two main divisions are dorsal, each 

 having a smooth basal process directed backward and. a 

 fusiform dorsal region composed of lamellte, which from the 

 stem backward abut on the smooth basal process, whilst 

 the laraellie of the portions in front of the stem are fixed to 

 a median ventral band. These lamellae are highly vascular, 

 the vessels or channels forming a close series of arches from 

 twelve to eighteen iu number along each leaflet, the free 

 margin of which is crenate. The posterior branchiae are much 

 smaller, but they also have a basal trunk to which the lamelhe 

 are attached. The lamella? are more or less conical, having a 

 distinct apex to which the vascular channels point, and thus 

 they are more or less straight and nearly vertical. A coagu- 

 lated fusiform mass occurred in the basal trunk of one. In 

 the tube the branchiae are turned forward with the basal 

 region, the smaller pair uppermost and the lamellte next 

 the dorsum. 



The first setigerous group commences on the second seg- 

 ment, at the upper or lateral edge of the ventral glandular belt, 

 and below it is a slightly curved elevation with the convexity 

 anterior. Seventeen setigerous processes follow. Each is 

 short and stout, with a slightly bevelled tip grooved for the 

 bristles. The first and second are smaller, and they slightly 

 diminish posteriorly. The pale golden bristles have long 

 and nearly cylindrical shafts, a little narrowed at the 

 proximal end and distally tapering to a somewhat stiff 

 curved tip, which ends in a hair-like point. The tip has 

 narrow but distinct wings. The bristles appear to be in a 

 single series — the stouter dorsal and the more translucent 

 and slender ventral in position. 



The rows of hooks commence on the sixth segment and 



