242 FRANK E, BEDDARD. 
together with the modified integument immediately surround- 
ing them, occupy nearly the whole of the ventral surface of 
the worm. Between the anterior and the posterior orifice is a 
tract of integument of the same character as that which imme- 
diately encircles the pores, and differing from the clitellar 
tissue. 
The sete are as in the other species of the genus. 
The internal structure, no less than the external charac- 
ters, distinguishes Polytoreutus elongatus from the re- 
maining species of the genus Polytoreutus. These dif- 
ferences mainly concern the spermatothecal sacs, which are 
different in all the species of the genus. In other particulars 
there is less difference. The last specially thickened septum 
divides Segments xt and xu. The last pair of hearts are in 
Segment x1. There are the usual three median calciferous 
pouches in Segments 1x, x, and x1. The calciferous glands 
are present, but have a very unusual form; they appear to 
lie in the 15th segment, but I am not able to be quite certain, 
as the segments just about this region were hard to fix. Not 
only are the calciferous glands unusual by reason of their 
position, they are also peculiar in shape. Lach gland is 
situated at the sides of the cesophagus, and is curved up like a 
ram’s horn. 
As in the other species of the genus there is but a single pair 
of funnels; andI presume, though I have not actually verified 
the fact for the present species, they have only a single pair 
of testes. The funnels of the sperm-duct lie in the llth 
segment, and the funnel itself is preceded by a dilated section 
of the sperm-duct, which has an opaque white appearance, and 
is of large size. It is directed obliquely backwards. I have 
not followed the course of the sperm-duct. 
The atria are long; they open together into a terminal 
bulbus which is median in position, and again opens on to 
the exterior by the anterior of the two genital orifices already 
described. The atrium belonging to the right side of the body 
was extended at full length, while that of the opposite side 
was looped once or twice. The fully extended atrium reached 
