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 fibril lee* It is extremely 
narrow 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 narrow, 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- 
