Earthworims of the Vienna Museum. 123 
upon each side of a median gap. The eighteenth segment 
has five or six sete upon each side of the median gap. 
Dorsal pores are present, and commence, as in Megascolex 
armatus, between segments v./vi. 
The oviducal pores, as in Megascolex generally, are double ; 
each pore lies in front of the innermost seta of segment xiv. 
The male pores are upon segment xviii. No set lie 
between them; they are placed in the line of the sete. 
Each pore is surrounded by prominent lips, and there is a 
genital papilla in front of and behind each pore; the papille 
in question are upon the boundary-lines between segments 
XVil./xvili. and xviil./xix. 
In Schmarda’s figure of the species the clitellum is depicted 
as commencing with segment xv. ; but in the text it is stated 
to commence after the thirteenth. 
When the worm was opened by a median dorsal incision 
the intestine was partially cut into; otherwise the viscera were 
uninjured. Five of the intersegmental septa were specially 
thick and appeared of a brownish colour, the thin septa being 
bluish or colourless. The first thick septum follows imme- 
diately after the gizzard ; in front of the gizzard lies the first 
recognizable septum, which is also rather thick; between 
this and the septum following the gizzard is a thin septum. 
The thick septa are bound by numerous isolated muscular 
strands, which show interference-colours. The number of 
them appeared to me to be unusually great for so small a 
worm ; they were particularly abundant in the gizzard-seg- 
ment and in those lying in front of the gizzard. 
The alimentary tract presents the usual divisions; the first 
four segments were occupied by the buccal cavity, pharynx, 
and a part of the esophagus. The buccal cavity was largely 
everted; the pharynx did not present the compact appear- 
ance which is usual in this organ; the muscular fibres forming 
its dorsal wall and connecting it with the parietes were greatly 
broken up into bundles running chiefly in a longitudinal 
direction ; this was no doubt due to the protrusion of the 
buccal cavity and the consequent pushing forward of the 
pharynx ; the fifth segment was entirely occupied by the ceso- 
phagus—the gizzard lying in the two following; the fifth seg- 
ment is not bounded posteriorly by a distinct septum, but 
the sixth and seventh are separated by aseptum. The forward 
position of the gizzard and the presence of a septum dividing 
the two segments in which it lies are characteristic of the 
genus Megascolex, at least these features are not met with in 
Pericheta (s. s.). The terminal section of the cesophagus is 
exceedingly narrow, and the large intestine suddenly begins 
