204 " ENDEAVOUR " SCIENTIFIC RESULTS. 



The first segment carries a parapodiuni as usual, and the 

 ventral cirrus is rather larger than that on the following. 



The anterior eight feet differ from the rest in lacking the 

 gill, which makes its appearance on the ninth. 



The base of the foot is not quite so high as that of the body. 



The pharynx was wholly withdrawn. On opening the body 

 it is seen to reach to the eighteenth segment. The organ was 

 slit open and mounted. The entrance to the pharynx is sur- 

 rounded by a circle of 20 rather long, closely set, bifurcated, 

 filamentous papillae, with a single shorter one in the dorsal 

 and ventral mid-line. 



The buccal region presents 20-22 longitudinal rows of 

 similar but shorter papillae, which decrease in size towards 

 the mouth. These rows commence at alternathig levels 

 (cf. MTntosh, PI. xxvi., fig. 4), and those on the dorsal surface 

 commence immediately behind the pharyngeal papillae ; those 

 on the ventral a good deal further back. These rows 

 diminish in number towards the mouth, where only 14 can 

 be counted. 



I cannot detect in the mounted preparation any evidence 

 of the bifurcation of these rows of papillae, as the mouth is 

 approached, such as are figured by M'Intosh and by Ehlers ; 

 though otherwise there is a considerable degree of agree- 

 ment. May it be that as the animal grows the length of 

 the buccal rows increase and then bifurcate ? It is difficult 

 in this retracted state to compare their arrangement with 

 that figured by MTntosh of the everted organ. 



About midway along the pharynx is the usual dorsal and 

 ventral brown conical denticle. 



I have stated that there are differences between this form 

 and the accounts of the species. Not only so, but the figures 

 given by MTntosh are not altogether in accord with those 

 of Ehlers. 



In the first place the shape of the prostomium is longer in 

 the fragment before me than in most of the figures. In 

 MTntosh's figures the proportion of length to breadth differs 

 according to the state of eversion of the pharynx — explicable 

 perhaps by the fact that when fully averted the prostomium 

 is stretched laterally (cf. PI. xxvi., figs. 1, 3, 5). 



In fig. 3 the length to breadth is about as 3 : 2 : but in others 

 the two approximate, and in Ehlers' (PI. 1., fig. 10) the 

 breadth is the greater. Moreover, he does not show an angle 

 at the posterior end, which is distinct enough in MTntosh's 



