1915.] J. STEPHENSON : Indian Oligochaeta. 85 
The dorsal pores begin from groove 6/7, and are present on the clitellum. 
The setal rings are broken dorsally and ventrally, aa=2ab, zz=2yz. The setae 
are in regular longitudinal lines, but are not grouped in pairs; ab=bc. The ventral 
setae are larger in the anterior part of the body, and at the posterior end they are 
again larger than in the middle. In front of the clitellum the setae are 12 per seg- 
ment, 2.e. 6 on each side (on some of the most anterior segments apparently only 
4 or 5 on each side), behind the clitellum the ring consists of 16. 
The clitellum extends over xiv—xvii=34. It is smooth, without setae, dis- 
tinctly limited at each end. 
The male pores are on xviii, on relatively large conical papillae, in line with 5, 
and distant from each other rather more than + of the circumference. 
The female pore is a minute pit, single, on xiv. 
The spermathecal apertures are inconspicuous, in groove 8/0, in line with b. 
A genital area is present on segment xii, a transversely oval, mesially situated, 
relatively large flat papilla; its general colour is whitish, its central portion darker. 
It is defined sharply behind by groove 12/13; it extends slightly at its rather indefi- 
nite anterior margin on to xi, obliterating the mid-ventral portion of groove 11/12. 
Its transverse diameter is about twice its longitudinal; it extends laterally as far as 
the line b; setae a are prominent on it. 
Internal anatomy.—Septum 4/5 is doubtfully present; 5/6 is very thin. No septa 
are markedly thickened, though all from 6/7 as far as the prostates appear somewhat 
thicker than those behind ; but degrees of thickness, when slight, are not easy to 
estimate in such a small worm. 
The gizzard is in vi, well developed, barrel-shaped. No calcareous glands were. 
seen. 
The last heart is in xiii. 
Large tufts of micronephridia are present at the sides of the alimentary canal in 
front of the gizzard; and behind the clitellum there are regular transverse rows in 
each segment. 
Testes and funnels are free in x and xi. Seminal vesicles are present in xi and 
xii, on the anterior wall of the segment; those in xi are small, and consist of a few 
rounded lobules; those in xii are larger grape-like masses, which nearly meet above 
the oesophagus in the middle line. 
The prostates are conspicuous rectangular masses, only slightly incised into 
lobes; they cause a considerable constriction of the intestine; they occupy segment 
xviii, and by bulging back septum 18/19 appear to extend through xix also. The ductis 
short, relatively narrow, almost straight, shining, and of equal u; throughout. 
The female organs are normal in position. 
The spermathecae (fig. 21) are one pair, lying in segment ix. The ampulla is 
much elongated, fusiform in shape; the duct is very short and narrow. A single 
diverticulum is given off from the base of the ampulla ; it is finger-shaped, two-thirds 
to three-quarters as long and half as wide as the ampulla. 
There are no penial setae. 
