72 Memoirs of the Indian Museum. [Vor. VI, 
It is interesting to note, in the present form, the considerable separation of the 
setae of the lateral bundles, and their shifting dorsalwards,—especially the remark- 
ably high position, near the mid-dorsal line, of the setae d. This may perhaps repre- 
sent a first step towards the perichaetine arrangement. 
Finally I may perhaps add that the single series of spermathecae presented itself 
to me as being possibly related to the long thin conformation of the worm,—until 
I looked up the dimensions of the only species of Fletcherodrilus (the other genus with 
unpaired spermathecae), and found that this has a diameter of 6—10 mm! It is 
true that Fletcherodrilus is also longer than the present form, but in nothing like the 
same proportion. 
Genus PERIONYX. 
In addition to two new species described at length below, examples of the genus, 
unfortunately indeterminable as regards the species, came to hand from the Rung- 
neet tea estate, 4500-5000 ft., Darjiling district; Horton Plains, 7000 ft., Ceylon, 
in water at the base of a cardamom flower a few inches from the ground (this possibly 
P. excavatus, E. Perr.); and Kavalai, 1300-3000 ft., Cochin State. 
Perionyx bainii, sp. nov. 
(Plate VII, fig. 14; pl. VIII, fig. 15.) | 
Simla, 13 miles below Sanjauli; 7-viii-1914 (Baini Parshad). Two sexually mature specimens. 
External characters.—Dimensions of the larger, 50 mm. in length, 24 mm. 
diameter ; of the smaller 23 mm. and max. diameter 2 mm. Colour dark bluish purple 
dorsally, grey ventrally. Segments 94. | 
Prostomium epilobous +, the posterior ‘tongue’ delimited by a transverse groove- 
behind. 
The:dorsal pores conspicuous, begin from groove 4/5. 
The setal ring is closed ventrally in the post-clitellar portion of the body; in 
front of and on the clitellum the ring may or may not be broken. ‘There is a definite 
eee small dorsal break in the ring; in front of the clitellum zz—2yz, bs 
13yz. The numbers of setae counted were vii/52, xiii/ca. 55, xx/50. 
The clitellum extends over the 5 segments xiii-xvii; setae are present, but the 
furrows:are almost obliterated. 
The male pores (fig. 14, ¢ ) are on segment xviii, near the middle line, and appear 
as transverse cracks, each bounded at the outer end by a small tag-like papilla (¢) (the 
‘tags’ very slight in the second specimen). In front of and behind each aperture, 
near the anterior and posterior borders of the segment respectively, is a slightly 
curved groove, the concavity facing the male aperture; each groove is deepest later- 
ally, shallower towards the middle line. In the second specimen the grooves of 
opposite sides are continuous across the middle line in front of and behind the male 
pores, and the whole region constitutes an oval genital field. A number of small 
fissures mark the surface in the vicinity of the apertures; some join the margins of 
