154 Dr. F. E. Beddard on a 
narrow and subequal, both together about equalling in length 
the third. These three segments are to be also distinguished 
by longitudinally and irregularly furrowed skin, that of the 
ensuing segments being taut. The fourth segment is either 
equal to or about a third longer than the third. Segments 
4-13 are ridged at or about the middle line. 
The sete are strictly paired throughout the body, and do not 
diverge posteriorly into wider couples. Nor are they larger 
on the posterior segments. These sete are ornamented. 
The ventral pair do not commence until the seventh segment. 
The dorsal are not to be seen until either the twenty-seventh 
or twenty-eighth segment. 
The nephridiopores are in front of the dorsal pair of sete, 
but not always in front of one or other of those sete; their 
position may correspond to the interspace between the two 
setee. 
The cltellum—saddle-shaped, as in other species of the 
genus—was only to be seen in two examples. In both of 
these it ended with the twenty-sixth segment; but it is 
less certain where it begins. I should say that certainly the 
sixteenth, and possibly the fifteenth, was the anterior segment. 
As is also at least usual in the genus, the region of the 
clitellum which bears the tubercula pubertatis has a wide 
interspace (occupying all the space between the tubercula) 
where clitellar tissue is not developed; anteriorly it is not 
quite so distinct. 
Though it may be difficult to map with accuracy the 
segments of the clitellum, the boundaries of the tubercula 
pubertatis give room for no doubt. They occupy segments 
20-25 (as in Th. benhami alone among those enumerated by 
Michaelsen *), from end to end of which the flat translucent 
grey band representing these structures extends. It is borne 
upon a raised fold just outside of the ventral pair of sete, 
and this ridge may just reach on to the nineteenth and 
twenty-sixth segment at each end. It is important to note 
that the tubercula, which are interrupted at the intersegmental 
furrows, do not vary in the three individuals, since it would 
appear from Michaelsen’s Tables t that a dozen or so of the 
species of the genus do vary slightly in this particular. It 
may be, however, that this only refers to the ridge which 
bears the actual tubercula pubertatis. 
The genital sete occur on the segments of the clitellum and 
also apparently on two segments in front of this. They are 
associated with, and emerge from the centre of, circular 
* Loc. cit. t Loe. cit. pp. 58-81. 
