27*2 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



capillary setse, about *2 to '3 mm. long, bearing along one 

 edge of their distal fourth a narrow lamina, which may be 

 slightly dentate distally (fig. 11C). In some setse the 

 whole of the lamina seems to be broken up into a series of 

 minute pointed processes similar to, but, of course, smaller 

 than, those of the adult seta?. Some of these seta? have a 

 narrow but shorter lamina on the opposite side. The 

 other notopodial seta? are quite different (fig. 11 ^4, B). 

 They are only about "18 mm. long. Each of them ends 

 in a long fine point and beyond the middle of its length 

 the seta bears a thin but broad lamina or wing on each 

 side upon which faint oblique striatums are occasionally 

 visible. Each notopodial pencil contains only one seta 

 of the latter kind accompanied by one to five of the longer 

 capillary seta?. The shorter seta? with a broad lamina on 

 each side soon disappear, they are not recognisable in 

 young specimens, 17 mm. long, from the sand. 



The neuropodial crotchets are about 04 — -05 mm. 

 long (fig. 15). Each has a thickening upon the shaft 

 lying just below the level of the epidermis. On examin- 

 ing the rostral region there are seen to be two or three 

 well-marked teeth behind the rostrum, and a small process 

 often ending in a fine point under the rostrum. These 

 structures are in focus along with the rostrum, and lie 

 approximately in the same plane. On careful focussing, 

 it may be seen that the teeth are not confined to the 

 region behind the rostrum, but that on the sides of the 

 latter there are small teeth, so that the rostrum projects 

 from the centre of a series of teeth situated around its 

 base. The sub-rostral process marks the position of the 

 smallest of these teeth. In their natural position the 

 crotchets lie so that the tip of the rostrum is directed 

 dorso-laterally. In most post-larval specimens about 

 mm. long each neuropodium bears only two to six 



