G4 Prof. M'Intosli's Notes from the 



(PI. III. figs. 12 & 13) arises as a somewhat thicli process on 

 each side of the dorsal fissure — leaving, however, a consider- 

 able portion of the centre bone (where the two ridges pass 

 forward, one on each side of the deep central fissure). It 

 then passes laterally and is separated by a notch from the 

 ventral border, which has two median flaps. This collar has 

 certain resemblances to that of Branchioumia. In the centre 

 in front of these is the symmetrical process formed by the 

 lips. The branchiae are comparatively short, are richly 

 banded with purple and white, and number about fourteen 

 or fifteen on each side, terminating in a short slightly- 

 tapered process, flattened and grooved internally. The 

 pinncc are rather thick and short, diminish toward the tip 

 of the filament, and end somewhat abruptly at the base of 

 the terminal process. Each bears three or four pairs of 

 eyes externally, the distal pair apparently being most dif- 

 ferentiated. Each eye is elevated above the filament and 

 is comj)osed of a series of somewhat regukirlj^ arranged 

 pigment-cells with a clear corneal surface^ the whole being 

 only less differentiated than the larger eyes of Brati- 

 chiomma. The tentacles are somewhat short, flattened 

 at the base, and tapered distally. They are not quite one- 

 third the length of the branchiae. The anterior region 

 consists of nine segments, the dorsum being very slightly 

 hollowed at the fissure, whilst the rest is more or less 

 rounded. The ventral surface is flattened, nine entire 

 scutes being in front, and thereafter each is bisected by 

 the median furrow which passes to the tail. The body 

 appears to be rather short and stout, tapering gently to the 

 posterior end. Nine pairs of bristles are found anteriorly, 

 the upper bristles (PI. IV. fig. 4) having longer striated 

 shafts and tapering tips with narrow wings and serrated 

 edges. The tips of the inferior bristles (PI. IV. fig. 5) just 

 project beyond the skin, and these are shorter and have 

 wider wings, the shafts also having striae which are con- 

 tinued into the tips, and the shafts are slightly narrowed 

 below the wings. The posterior bristles are shorter and 

 fewer in number in each tuft, but the length and slenderness 

 of the tips increase toward the tail. The constriction of 

 the neck below the wings and the projection of the base 

 of the winged region give a character to each tuft pos- 

 teriorly, so that it is tulip-like, and the tips are comparatively 

 short. The anterior hooks (PI. IV. fig. 6) have a somewhat 

 short and sharp main fang, which leaves the neck at less 

 than a right angle. The crown above it is high with 

 numerous minute teeth. The dorsal outline is convex and 



