1916. } J. StrEPHENSON : Indian Oligochaeta. 347 
The micronephridia are present behind the clitellum in four 
rows on each side; each is a flat plate-like organ, subcircular in 
shape or rectangular with rounded corners. The rows nearly touch 
each other, and each organ being in longitudinal extent equal to 
about the length of a segment, the bodywall is pretty completely 
lined by them,—probably entirely so in the natural condition of 
the parts. The lowest row on each side is smaller than the others, 
and there is occasionally a fifth, still more ventral; if so it is also 
small. 
In the clitellar region the nephridia have more the ordinary 
form of twisted tubes. More anteriorly some are seen in the 
neighbourhood of the spermathecae, but none are visible, in the 
dissection, on the bodywall; they may be seen in sections in the 
male genital segments. 
Testes and funnels are free in segments x and xi. 
The seminal vesicles are in segments x and x1; in the dissec- 
ted specimen none were present in xii. In the sectioned specimen 
a visicle was present on the right side in xii; it was of racemose 
form, composed of small rounded masses, each stalked and 
attached to a stem which in turn was implanted on septum I1/I2 ; 
the whole, though not of large size (smaller than those in the seg- 
ments in front), was still a conspicuous feature in the anatomy. 
The prostates are tubular, in segments xvii and xix. That in 
xvii lies behind the calcareous gland, that in xix behind the bulg- 
ing of the intestine, in the respective segments. They are verti- 
cally placed by the side of the alimentary tube, and the muscular 
duct is directed inwards from the lower end of the gland. 
The spermathecae (fig. 35) are contained in segments vii and 
viii. The ampulla is rather small, ovoid in shape, and divided 
from the duct by a marked constriction. The duct is at least of 
the same size as the ampulla, pear-shaped and narrowing gradually 
to the aperture ; the interior of the duct is occupied by a gelatin- 
ous-looking non-staining mass. A minute tag-like diverticulum is 
present in some, but not, apparently, in all; it arises from the 
duct on its anterior face at about the middle of its length. 
The penial setae (fig. 36) are of several types. (1) A slender 
form 3°5# in thickness, with straight shaft and thin flattened oar- 
like extremity; the width of the flattened end is 6". (2) A form 
which also presents a narrow shaft and expanded tip; but the 
expanded portion is one-sided only; length -28 mm., thickness 
at middle of shaft 4r. (3) A stout variety, breadth 7;, shaft 
straight in its proximal, gently curved in its distal portion; the 
distal end presents a few blunt projections on its sides and on 
the concavity of the curve. (4) A mixed type combining the tip 
of the second and the stout shaft of the third variety; the shaft 
shows a gentle, almost even curve, and tapers towards its free end ; 
the extreme point is furnished with a wing-like expansion on one 
side only; length across the bend *3 mm., thickness at middle 6,, 
at proximal end 7; . 
