84< SUPPLEMENT 



stratum, which is divided into five longitudinal bands ; a 

 single dorsal, and two inferior pairs. It is between the in- 

 ferior edge of the dorsal, and the superior edge of the external 

 abdominal band, that the setae are implanted. 



The intestinal canal is retained to the parietes of the visceral 

 cavity, only by a small number of fibrillse. It is extremely 

 naiTow at its commencement at the mouth, and without any 

 traces of teeth in the buccal cavity, but it increases by degrees, 

 in bulk, and after a sensible and sudden contraction, it forms 

 the stomach. The latter, corresponding pretty nearly to the 

 eighth articulation, is membranaceous, a little swelled in the 

 middle, and at the twelfth, or thirteenth articulation. It be- 

 comes a little more naiTow, but more fleshy in the place where 

 the intestine, properly called membranaceous, exists, which is 

 continued directly to the anus, surrounded immediately by the 

 external envelope, to which it adheres in all parts. 



The respiratory apparatus, altogether exterior, is formed by 

 gills above described, which are evidently only ramified ves- 

 sels enveloped with a skin considerably attenuated. 



The latter, proceeding no doubt from the ramifications 

 which return from the gills, follow, as usual, the inferior and 

 medial part of the abdomen. 



The apparatus of generation consists of a female, and of a 

 male part. 



The female part is composed of a single medial ovary, oc- 

 cupying the whole inferior face of the visceral cavity, as far 

 as the ninth ring. Pallas tells us that it terminates behind in 

 a bifurcation. This mass, which presents irregular, transverse 

 strata, is white, and is composed of a great number of oviform 

 grains. It is terminated by a single orifice, of which we 

 have just spoken. 



The male part consists of four pairs of small pyriform 

 vesicles, the base being behind, and the neck forward, placed 

 on each side of the anterior moiety of the ovary. The an- 



