14 ALFRED GIBBS BOURNE. 
Prostomium small, not dovetailed into the peristomium. 
Setze.—Segment 11, 24; v, 44; 1x, 36; xx,36. The number 
is subject to variations,and they are not very regularly arranged. 
No modified sete are present. The dorsal gap is equivalent to 
about ten seta gaps, and the ventral gap to about three or less. 
Clitellum not strictly confined to particular segments ; it 
extends over Segments x111I—xvi1r and a little into Segment 
xu. The dorsal pore x1i1-x111 lies well within the clitellum, 
and posteriorly it extends nearly up to the seta ring of Seg- 
ment xx. It is not well developed in the ventral region. 
Genital Apertures,—The male pores lie in Segment xvu1 
and thus in the clitellar region, although the clitellum is not 
developed in their neighbourhood. They lie in a small dumb- 
bell-shaped pit in preserved specimens. The distance between 
them is equivalent to about five seta gaps. There are no 
setee between them. There are no other apertures in this 
region. 
The oviducal apertures are paired, and lie about in the direc- 
tion of seta 1, and just in front of the seta ring in Segment xtv. 
The spermathecal apertures are placed between Segments 
VII-VIII and vVIII-Ix, and in the direction between seta 1 and 
seta 2. 
Dorsal Pores.—The most anterior dorsal pore lies between 
Segments v and vi. They remain obvious between the clitellar 
segments. 
Alimentary Tract.—Gizzard is in Segment v. 
The cesophagus presents dilatations with vascular walls in 
Segments vi to x111. There are well-developed calciferous 
glands in xiv, xv, and xvi. Saccular intestine commences in 
Segment xVIII. 
There are no intestinal ceca. 
There is no typhlosole. 
Nephridia.—There is a pair of complex (see below) 
nephridia in each of Segments vir to x1, and a pair of small 
simple nephridia in each of the following segments. There are 
no micronephridia. 
Generative System.—Testes lie in Segments x and x1, 
