Two New /S'pe&ies of Cluietognster. 91 



there are strong muscles so arranged that the setae are capable of 

 rotary movement or up and down, or they caii spread out like a fan. 

 The setae of the first bundle are longer than those of the others, 

 being approximately lialf as long again; they are situated at the 

 level of the pharynx, while the second are at the level of the hinder 

 end of the crop. Each seta is somewhat / shaped, bifurcated at one 

 end. with two unequal prongs, and a swelling near the middle. 

 (Fig. vi. A.) There are no dorsal setae. 



Body Cavity: 



Tlie body cavity is divided up by the septa into segments. The 

 septa are more clearly distinguished towards the anterior end, and 

 by their aid we find the portion without setae consists of three 

 segments. (Fig. i.). Each septum is very thin, with hei'e and there 

 a slight swelling caused by nuclei. The first septum is behind the 

 pharynx, the second at the beginning of the crop, the third and 

 fourth in the region of the crop, and the fifth at the posterior end 

 of the crop. (Fig. i.) 



I could not see any corpuscles in the body cavity. 



All Die lit (try Canal. 



The moutli, which is, large and circular, opens on the venti-al 

 surface; the buccal cavity is somewhat globular anteriorly, but 

 narrows posteriorly; (Fig. iv. BC) it is lined with indefinite cells 

 without any clear nuclei, and its walls are very much stiengthened 

 by muscle bands. 



The pharynx (Fig. iv. P.) is a wide tube leading from the buccal 

 cavity to the oesophagus. Its walls are also very muscular. It 

 extends back to the third segment. 



After this the canal narrows to form the oesopliagus (Fig. iv.O. ; 

 Fig. i. O.), lying in the third segment. This differs from the pharynx 

 in being of much smaller size, not so muscular, and in having its 

 inner lining thrown into more folds. The buccal cavity, pharynx, 

 and oesophagus are, all three, attached to the body wall by numerous 

 strong muscle bands. 



The canal then, in the fourth, fifth and sixth segments, forms 

 another dilatation, the crop. (Figs, i and iv. C.) This is about 

 twice as long as the pharynx, is not attached to the ])ody wall by 

 well-defined muscle bands, and contains little muscular tissue, but 

 has little blocks of muscle round the outside of its walls, and is 

 lined by large distinct glandular cells, with very distinct nuclei and 

 nucleoli. (Fig. iv. C.) 



