STRUCTURE OF THREE NEW SPECIES OF EARTHWORMS. 115 
course the “testes” of my former paper on Typhaeus) are 
long and tongue shaped, and extend back on either side of the 
oesophagus as far as the male pore, i. e. to the seventeenth 
segment ; they commence in the tenth segment, and therefore 
occupy seven segments. The surface of the vesiculae is not 
plain and smooth, but projects into numerous irregular 
rounded clusters. At the anterior extremity the vesiculae 
become attached to the last thick septum, and just below their 
attachment is a small cavity, which contains the testes and the 
funnels of the vasa deferentia (PI. XII, fig. 1 ,a.). This is to 
be regarded, I imagine, as a median unpaired portion of the 
vesiculae which so often occurs in Earthworms. 
This compartment contained a mass of spermatozoa; it is not 
divided up by trabeculae, as are the paired portions of the vesi- 
culae, except for two fibrous bands which pass up to the mesen- 
tery. The innermost pair of setae of the tenth segment (see 
above, p. 112) are enclosed within this compartment. 
The testes are contained within this compartment; they are 
a pair of round bodies (fig. 1, t.), which have very much the 
appearance of a woollen button. 
The single pair of vasa deferentia funnels (/.) are also 
contained within this compartment ; each is situated exactly 
opposite to its own testis. 
The vas deferens of either side passes down to the seven- 
teenth segment, where it opens on to the exterior near to the 
atrium and a bundle of penial setae, as in T. orientalis (PI. 
XII, fig. 1). 
Perhaps the most remarkable fact in the anatomy of this 
worm is the peculiar relation that exists between the atrium 
and the vas deferens. These two structures in other Earth- 
worms open together by a common duct. In Typhaeus, how- 
ever (fig. 1), the vas deferens, which becomes a little wider 
at its termination, enters the body wall independently of 
the atrium and behind it. A series of transverse sections 
through this part of the body show that the vas deferens does 
ultimately join the atrium, though only just beneath the epi- 
dermis. The vas deferens is ciliated up to the point where it 
