STHENBLAIS BOA. 411 



very pretty and symmetrically tinted arrangement thus pertains in this region. The 

 first pair of scales are somewhat ovate, the rest more or less reniform, and they are 

 tough, — adhering, moreover, with considerable tenacity to the tubercles. Their surface is 

 entirely covered with minute papillae, which are often tinted brownish, and along the 

 anterior and neighbouring part of the outer border are a series of massive and simple 

 cilia, somewhat constricted at the base, then dilating and tapering to a blunt tip. Some 

 show a branch or knob near the base. In the other scales a portion of the outer and 

 anterior region is devoid of the minute papillae, whilst amongst the cilia of the outer 

 border are numerous minute globular papillae. Both extend here and there within the 

 border. The inner or rounded anterior lobe of the scale has the papillae up to its border. 

 The scales occur on the first bristled foot, third, fourth, sixth, eighth to twenty-fourth, 

 twenty-sixth, twenty-seventh, &c, to the end of the body. In the terminal region the 

 small scales retain the same characters, though a patch devoid of papillae occurs on the 

 anterior part of the ronnded inner lobe, and the cilia along the external border are 

 smaller, more slender in proportion, and more numerous. The minute papillae on the 

 surface occasionally project beyond the border posteriorly in all the scales, and the gradual 

 elongation of the cilia externally shows that they are modifications of the same organs. 

 The largest papillae occur on the exposed part of the scale. Finely branched nerves 

 supply the entire organ. The scales often have a blackish or brownish deposit of 

 granular matter on their surfaces. It seems to be the same as that which occurs in the 

 Polynoidae. In young examples the papillae on the scales are proportionally large, and 

 occasionally sand-grains adhere. The cilia also are somewhat larger. 



Feet. — The second foot shows dorsally two ciliated lobes. It has two powerful 

 spines. The dorsal division is indicated by the nature of the bristles and by the issue of 

 the spine beneath them. The dorsal bristles consist of the same slender, elongated, 

 finely spinose forms seen in the previous process, the tips of most being broken. They 

 have the infusorial parasites formerly indicated and fine filaments of an alga. The 

 ventral division bears much stronger bristles, the stout shafts of which merge into the 

 distal spinous region without evident change. The slightly alternate rows of spines are 

 prominent, and this region ends in a long, tapering, articulated appendage terminating 

 in a bifid tip, the dorsal process being hooked. Just above the lower edge of the ventral 

 region a series of large, lobate papillae project, and below the bristles are a curved series 

 of minute papillae. The ventral cirrus, as in the previous groups, is large and 

 tapering, its tip extending considerably beyond the fleshy part of the foot. The funnel- 

 shaped papilla external to this organ is absent. 



The third foot shows a T-shaped ctenidium dorsally. The dorsal division of the 

 foot is more clearly indicated by a fissure, and its lower border is furnished with large 

 clavate papillae. The bristles curve upward and inward, their convexity being thus 

 external. The bristles of the ventral division have already a tendency to form groups. 

 Thus the upper six of the ventral series consist of moderately stout shafts with simple 

 tapering tips which are coarsely spinous inferiorly and finely spinous distally, the tip 

 being smooth. Then follow the stouter forms, as in the second foot, with spinous 

 regions distally and a jointed, tapering, bifid appendage. Amongst these, however, are 

 some with an unjointed terminal appendage, a powerfully hooked tip, and a strong 



