210 ■' ENDEAVOUR " SCIENTIFIC RESULTS. 



The mouth is partially blocked up by a pair of large oval 

 convex oral pads, separated by a deep groove in the middle 

 line, as is figured by Ehlers in S. cerasina. 



The peristomium is longer than the nuchal segment, 

 dorsally and laterally, but on the ventral surface it is shorter, 

 where it forms the lower lip, which, like the lateral lip, is 

 longitudinally furrowed. 



The parapodia are long, nearly half the width of the body, 

 the dorsal cirri are longer, and as wide at the base as the 

 length of the segment (PI. xli., fig. 61) ; each is semi- 

 cylindrical, being flattened on the under and convex on the 

 upper surface, so as to appear " flattened " ; it is con- 

 stricted near its end into a knob-like appendix, which in 

 posterior segments is wider than the main stem, so that 

 the cirrus has the appearance of a penis. 



The first parapodium is small, and is borne, of course, by 

 the segment following the nuchal. It has no dorsal cirrus ; 

 the second foot has a relatively short cirrus, but on following 

 segments the cirri are of practically uniform length, are 

 directed nearly horizontally outwards, lying alongside the 

 body like a fringe. The ventral cirrus is short, stumpy, and 

 as wide as the segment is long. 



The body carries at its hinder end two pairs of subanal 

 cirri ; the upper is annulated with 9 rings, and is as long as 

 the dorsal cirrus of the penultimate segment ; the lower 

 cirri are short, smooth, and rather longer than the neigh- 

 bouring ventral cirri. 



The parapodia, seen under a lens, present three rounded 

 lips, a larger posterior and two rather shorter anterior lips 

 (PI. xU., fig. 62). 



A figure is given of the tenth foot. Studied under a micro- 

 scope, the posterior lip is seen to be slightly notched. The 

 parapodium is supported by a single golden aciculum, and 

 a couple of very slender bristles enter the dorsal cirrus, and 

 reach almost to the subterminal constriction. 



The chaetse are in two bundles ; the supra-acicular bundle 

 contains about 6 long curved capilliform bristles, with fine 

 serrations along its upper convex margin. 



In the sub-acicular bundle there are about 30 chaetae, 

 which are jointed, i.e., " gomphotrichs " ; the long appendix 

 has a subapical tooth of nearly the same size as the terminal 

 hook ; the wing is finely denticulated along the greater part 

 of its length (PI. xli., fig. 64). 



