48 ON THE ANATOMY OF MEGASCOLIDES AUSTRALIS, 
EXPLANATION OF THE PLATES. 
PLATE 1. 
bc ... buccal cavity. 
clt ... Special swellings in the clitellar region. 
dil ... dilatation of alimentary canal. 
dp ... dorsal pore. 
dv ... dorsal blood-vessel. 
fo ... female genital opening. 
£2 --. . gizzard. 
int ... Intestine. 
m ... mouscular slips passing from septum to septum. 
mo ... male genital opening. | 
n ... ventral nerve cord. 
ne ... small nephridia. 
0 sn OVALY. 
od ... oviduct. 
oes ... esophagus. 
phar ... pharynx. 
pr ... prostate gland. 
1S 0S ... spermathecee. 
rs'0 YS°0 ... openings of spermathecze 
SF eee setice: 
sept ... septum. 
sg ... cerebral ganglion. 
ae ... testis 
iy v ... transverse blood-vessel. 
vd vd' vd? vasa deferentia. 
vd'o vd’o ... internal openings of vasa deferentia. 
US ... vesicule seminales. 
a3 ... ¢litellum. 
Fig. 1.— Represents a somewhat diagrammatic view of the ventral surface of the 
worm in the anterior region of the body to show the segments, annuli and openings of 
the reproductive organs. The openings of the receptacula lie in the seventh and 
eighth segments, very close to the boundaries of the segments. Hach pair has a 
line on the surface enclosing it. The female openings are on the 14th segment, 
in front of, and having no relation to the sete. The male openings (mo.) are in the 
special ridges in the 18th segment, and correspond in position to the innermost pair 
of sete. In some worms another ridge is seen occupying the posterior part of the 
