86 Memoirs of the Indian Museum. [Vor. VI, 
Megascolex varians, Mchlsn. var. insolitus, var. nov. 
(Plate VIII, figs. 22-23.) 
Horton Plains, 7000 ft., Ceylon; under stones and logs; Dec., 1913 (S. W. Kemp). Six speci- 
mens, all mature. 
External characters.—The size varies; two of the specimens are considerably 
larger than the rest. Length up to 70 mm., maximum diameter 3 mm.; colour light 
grey, both dorsally and ventrally. Segments 111. 
Prostomium prolobous. Dorsal pores begin from 6/7; they are e just visible on 
the clitellum. 
The rings of setae are eee dorsally and ventrally; dorsally in front of the 
clitellum zz=2-2hyz, behind =3-33yz; ventrally, in front of the clitellum aa—=2}ab, 
behind—3ab and more posteriorly—4ab. The setae of segments ii-vii are enlarged. 
The lines of setae a and b are very regular, and setae a and b are larger than the 
others of the same segment. As to the intersetal intervals, ab—bc >cd, de, etc.; 
the intervals after the first few are more irregular. 
The clitellum, extending over xiv—xvii=4, is smooth, and marked off by constric- 
tions at each end. 
The male apertures, on xviii, are small, round, and situated on slight papillae 
which are partly surrounded by grooves in front and behind. They are distant from 
each other about } of the circumference, and are situated in line with setae 0. 
There is no wall external to the apertures. 
The female pore is single, but in a very anomalous position,—on segment xv, 
instead of on xiv as is the universal rule throughout the Megascolecidae. The aper- 
ture is rather in front of the line of the setae, in a slightly depressed darker area. 
The anomalous position was found in all six specimens. 
The spermathecal apertures are a single pair, in groove 8/0, in line with b and 
distant from each other one quarter of the circumference. 
The only constant genital papilla is one on segment xii; this is oval, its long axis 
transverse; it presents on its rather flat surface a darker cloud oval ring ; it takes 
up the whole length of the segment from 11/12 to 12/13, and is not quite sym- 
metrical about the middle line (rather to the right in the type specimen, with its 
centre in a). In one of the specimens an additional papilla of the same kind is pre- 
sent on segment xx, in this case in the middle line, extending from beyond the line 
of seta a on one side to a corresponding point on the other; in another specimen, 
along with the papilla on xii one is present on xiii, but on the opposite side. 
Internal anatomy.—The anterior septa are very thin, and apparently incomplete; 
thus 5/6, the first, seemed to be wanting on the right side, and 6/7 was perhaps 
partly wanting on the right side also; in another specimen these two septa were not 
noted at all. Septum 7/8 is quite thin; 8/9, close behind the former, is slightly 
thickened ; 9/10 is considerably thickened. From this, which is the stoutest of the 
septa, fe thickness diminishes progressively, but so slightly that even at the level 
of the prostates the septa are in some degree stouter than those behind. 
