408 



Dft J. H. ASHWORTH 



but if so, the two rows stand very 



ten and a posterior row of about five 

 close together. 



(iii) Posterior to the foregoing are tapering, capillary chsetse, which appear to be 

 of two types, shown in text-fig. 1, C and D. There are about 

 forty chsetse of the type shown in fig. C ; each of these is 

 '9-1*2 mm. in length and 7-9 ^ in maximum diameter, and 

 tapers very gradually to a long fine point ; consequently the 

 distal portion of the chseta is very slender. There are fewer 

 chsetse — about five — of the type shown in fig. D. These are 

 about "5-'6 mm. long, and taper more rapidly than the pre- 

 ceding. They are originally laminate near their tips, at any 

 rate along one side, but the lamina is exceedingly fine. 



The first neuropodium bears capillary chsetse like those 

 in the notopodium, and one chseta similar to that shown in 

 text-fig. 1, A, was observed, but there are no stouter, bent 

 chsetse like those occurring in the notopodium. 



The chsetse of the second notopodium include repre- 

 sentatives of all the four types present in the first noto- 

 podium ; there is a single row of eight or nine of the bent 

 chsetse. 



The second neuropodium contains capillary chsetse 

 similar to those of the first neuropodium, but there are also 

 present two of the peculiar furcate chsetse (see below), so 

 characteristic of the family Scalibregmidse. There are no 

 stouter, bent chsetse like those in the notopodium. 



The armature of the third notopodium consists of (l) 

 an anterior row of eight or nine curved chsetse, similar to 

 those of the first two neuropodia ; (2) several furcate chsetse 

 standing near the former ; (3) a posterior series of capillary 

 chsetse of two types, similar to those shown in text-fig. 

 1, C, D. 



The third neuropodium bears capillary chsetse of the 

 usual two types and several furcate chsetse. 



In the following segments the capillary chsetse become 

 Tbxt-fig. 2.— a. Fmcate chieta considerably stouter and longer, attaining a length of 17-1 "8 

 ,ec ;- mm. and a diameter of 12-13 M , and the differences between 



men from Scotia Bay. ( x 200. 

 I!. Distal end of same cliseta. 

 (xl500.) 



the two types gradually disappear, so that in most of the 



segments the two types are not distinguishable. 



The furcate chsetse (text-fig. 2) form in both rami of the parapodium, from the 



third onwards, a fan-shaped series situated at the base and in front of the capillary 



chsetse. The shaft of each furcate chseta tapers gradually in its distal portion to the 



