BY J, J. FLETCHER. 
1549 
undeveloped. Between segments xvi and xvii, taking in the 
last annulus of the former and the first two of the latter, is an 
elliptical smooth and shining convex papilla or boss with a 
circumferential raised rim, extending a little dorsad of the first 
couple of setae on each side, narrower at the two ends than it 
is in the middle ; in worms with well developed girdles it is very 
conspicuous and large, and encroaches upon the preceding and 
succeeding annuli so that the inner couples of setae of xvi, when 
visible, are seen to be immediately in front of it, while posteriorly 
it may take in the last annulus of xvil, sKghtly pushing the 
ventral portion of xviii between the male pores a little out 
of place ; otherwise it is completely surrounded by the 
glandular epithelium of the clitellum. Two or even three 
somewhat similar but smaller papillae or bosses (sometimes how- 
ever they appear as depress ions) not extending beyond the inner 
couples or even the innermost rows of setae, may occupy similar 
positions between xviii and xix, xix and xx, and xx and xxi (that 
is to say the greater portion — two-thirds — of these intersegmental 
bosses belongs to the posterior segment of each pair) ; but any two 
of them — most commonly the first or third — may be absent or 
rudimentary : the relations of the papillae, even before the girdle 
is developed, variously diversified owing to a tendency of the 
ventral surface in this region to become modified. Frequently a 
ventral! intersegmental swelling is present between viii and ix, but 
^vithout definite pattern. 
The first doi-sal pore is between segments xi and xii. Xephri- 
diopores not visible. 
Alimentary canal : the gizzard has behind it the first complete 
mesentery — the posterior one of segment v — ; calciferous 
pouches are not present, but from viii-xiv the intestine presents 
slight dilatations, after which there is a large almost pear- 
shaped one occupying two segments — xv and xvi — which imme- 
diately attracts one’s notice on 0)>ening a worm ; in xvii the 
canal narrows again, while the large intestine begins in .xviii ; this 
is without any typhlosole of the ordinary character, but just from 
