42 Prof. ^M'lutosli's Notes from tlie 



■which (liininish as they go outward. A broader ring, the 

 secoiul body-segment, which bears the branchire dorsal ly, then 

 follows, the central region of which is likewise marked off by 

 two furrows from the lateral regions. This ring is partly 

 overlapped by the broad glandular belt, which stretches from 

 side to side of the next segment and clasps 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, au almond-shaped area beneath each setigerous 

 ])rocess is differentiated, and ou this the hooks appear on 

 the sixth bristled segment, and thereafter it becomes the 

 imcinigerous process. 



The branchice arise from the second and third segments by 

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

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

 liaving a smooth basal process directed backward and a 

 fusiform dorsal region composed of lamellfe, which from the 

 stem backward abut ou the smooth basal process, whilst 

 the lamelhe of the portions in frout 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 in numi)er along each leaflet, the free 

 margin of which is crenate. The posterior branchicC are much 

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

 are attached. The Jamella" are more or less conical, having a 

 distinct apex to which the vascular channels poiut, and thus 

 thev are more or less straight and nearly vertical. A coagii- 

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

 the tube the branchiaj 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 somewdiat 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 



