450 PROCEEDINGS OF THE ACADEMY OF [Juiie, 



on both sides for a short distance^ margin of sock&t tipped by a rather 

 long process, proximad to which are a few rather conspicuous teeth; 

 blade relatively short and broad, strongly hooked and bifid at the end 

 with a guard somewhat produced at the apex. In addition to these 

 all of the anterior parapodia, from the third at least to the fifteenth, 

 bear in the middle and ventral part of the neuropodium a number of 

 compound setse without guards; these are more numerous anteriorly 

 than posteriorly ; the shafts have nearly the same form as the guarded 

 setae, but the blades are straight or only slightly curved, rather broad 

 proximally, but with slender mucronate tips and obliquely striated 

 with one or both margins finely serrate; the blades vary greatly in 

 length, those in the dorsal part of a bundle being more than twice as 

 long as the most ventral ones in the anterior parapodia, while pos- 

 teriorly only the short ones remain. No compound setse occur in the 

 most posterior region, but just where they cease cannot be accurately 

 determined. 



Capillary setse are the most numerous and constant, occurring in all 

 parapodia from the third caudad. They differ considerably in length, 

 those dorsad of the aciculum being the longest and the stoutest as well, 

 those ventrad, which replace the compound setae as they disappear, 

 retain about the length of the latter. Toward the extreme posterior 

 end they appear to diminish both in number and size. All are slender, 

 tapering, very acutely pointed with a narrow smooth-edged 'vvdng, at the 

 beginning of which a more or less pronounced bend occurs. 



Paddle-shaped setae are also found in the extreme dorsal part of 

 some of the anterior somites, but their distribution has not been ascer- 

 tained. They have very slender shafts, wide, suddenly expanded, 

 asymmetrical, curved ends provided with about 20 very fine points of 

 equal length. 



All of the acicula are very pale yellow. Besides the projecting 

 acicula or setae, the first two parapodia exhibit'several (perhaps about 

 10, though the number cannot be certainly determined) long thread- 

 like internal acicula of constant thickness arranged parallel to one an- 

 other in a regular coil within the foot, those of the first being especially 

 long and forming an additional snarl near the base of its ventral side. 

 Notopodial acicula also appear, those of the first 2 feet being rather 

 strong, straight and stiff and ending in the base of the cirri ; in the 

 remaining parapodia they are delicate fibres passing far into the cirri. 

 The ordinary neuropodial acicula are 3 in number, the dorsalmost very 

 stout, all straight and tapering, with the slightly protruding point 

 blunt or slightly enlarged and sometimes a little curved. Guarded aci- 



