Earthworms of the Vienna Museum. 115 
the outermost seta of the dorsal couple; this is of course more 
apparent when the setee diverge posteriorly. 
The clitellum is developed in one specimen and occupied 
segments xv.-xxill. There are two pairs of calciferous glands 
in segments xil, and xi. ‘hese glands, as in Urocheta, 
stand out from the walls of the cesophagus instead of being 
attached to them along their whole length, as in most earth- 
worms ; they are subconical in form, the apex being direeted 
away from the gut. A large branch arising from the dorsal 
vessel on each side supplies the anterior glands, entering them 
at the apex. 
The principal difference, however, which this species shows 
from either of the other two species is in the sperm-sacs ; 
instead of being represented by a single pair of long “ tonzue- 
shaped” organs, the sperm-sacs of Anteus heterostichon 
are two pairs of small bodies attached to the anterior septa of 
segments xi. and xi. They appear, in fact, to resemble those 
of Anteus gigas. 
It is noteworthy that this species, like the other two, 
possesses no spermatheca; the absence of these structures 
seems to characterize the genus. 
The nephridia fall into two series; up to the twelfth seg- 
ment they have an exceedingly long muscular duct, which is 
shown by Horst in his figure * of the nephridium in Anteus 
gigas. I traced a delicate tube passing from this tuft of 
tubules forwards into the segment in front, where it doubtless 
ends ina funnel. Perrier’s figure + of the nephridium and 
his deseription give an erroneous idea of the structure. The 
description runs as follows :—“ Ces organes présentent d’ail- 
Jeurs dans ces deux anneaux et dans les sept suivants qui 
font également partie de la ceinture un calibre plus considér- 
able. Au lieu d’étre pelotonnés comme chez la plupart des 
Lombrics, ils sont simplement un peu flexueux ; leur calibre 
est suflisant pour qu’on puisse les injecter facilement par 
leur orifice extérieur, qui est lui-méme fort apparent sur la 
ceinture. Chacun d’eux est terminé par une sorte de houppe 
formée par une série de replis membraneux implantés sur sa 
portion terminale libre. Cette houppe constitue le pavillon 
vibratil au milieu duquel s’ouvre le canal.” This description 
imphes that the convoluted tuft of tubules is really a large 
funnel. 
Neither Perrier nor Horst noted that the pesterior nephridia 
are different in structure from the anterior series. Atter the 
twelfth segment (in the present species) the nephridia still 
* Notes Leyd. Mus. xiii. pl. vi. fig. 3. + Loe. cit. pl.i. fig. 14, 
g* 
