18 Prof. M'lntosli's Notes from the 



The first tuft springs from a setigerous process almost im- 

 mersed in the tissues of the united first and buccal segments, 

 hilt the posterior cirrus or process is distinct, though small, 

 '^rhe bristles are small tapering forms with very narrow 

 wings (some without evident wings), and in two series, viz., 

 a larger series, more deeply tinted yellow by transmitted 

 light and minutely dotted, and a more translucent smaller 

 series. All have finely tapered and nearly straight tips. 

 The rest of the setigerous processes of the region are charac- 

 terized by an increasing prominence, and the posterior 

 pa])illa is considerably larger. Each arises from a broad 

 l)ase, and is somewhiit flattened, since its vertical exceeds its 

 transverse diameter, and the distal end has three parts, 

 viz., the posterior process or papilla (not to be confounded 

 with either a dorsal or a ventral cirrus), which springs from 

 the middle posteriorly, and two areas for the bristles. Tlie 

 papilla is short and nearly cylindrical in the prepara- 

 tions, and is directed backward. The upper bristles arise 

 from a curved area above a papilla, so that the long axis of 

 the row is antero-posterior and the convexity of the tip 

 with the wings is turned outward and their points directed 

 backward. They have long shafts and finely-tapered slightly- 

 curved tips with narrow wings. The inferior row of biistles, 

 again, has its long axis vertical, and they have shorter and 

 stouter striated shafts, stouter tips, and broader wings. 

 The tip in all is finely pointed. 



The body is somewhat elongate, a large example reaching 

 100 to 110 mm., with a breadth of 3-5 mm,, flattened, and 

 tapered toward the tail, in front of which some examples 

 have the widest part of the body. At the tip is the crenate 

 anus. The dorsum is rather more distinctly flattened than 

 the ventral surface, and has a groove in front leading to the 

 branchial fissure ; whilst posteriorly it bends to the right 

 between the eighth and ninth bristle-tufts, and slants to the 

 ])osterior edge of the ninth bristled segment. The ventral 

 surface has the somewhat prominent median region occupied 

 by the scutes, the first of which, on the united buccal and 

 first segment, is the largest, and characterized by a dimple 

 in front. It is followed l)y eight others, each of which may 

 iiave an even margin or a median incurvation. The last of 

 the anterior scutes has posteriorly a median projection, to 

 which the boundary-line from each side slopes. From this 

 point the ventral median groove passes backward to the 

 tail, cutting the succeeding scutes into two equal halves, 

 Mhich occupy a little more than a third the bicadth of the 

 body of the preserved specimens, except toward the tail^ 



