1915.] J. STEPHENSON : Indian Oligochaeta. 57 
and, perhaps, the fact that the setae begin, as normally, in ii, and are certainly not so 
relatively small and very closely paired as in a number of species of the genus. 
Genus MONILIGASTER. 
Moniligaster deshayesi, E. Perrier. 
Parambikulam, 1700-3200 ft., Cochin State; 16—24-ix-1914 (F. H. Gravely), Two specimens, 
one without clitellum. 
External characters— Length 150 mm., breadth 6°5 mm.; colour a medium olive 
ventrally, considerably darker dorsally with a bluish tinge. Segments about 184. 
Prostomium not distinct; slight lateral thickened regions in each segment (cf. 
some species of Drawida, ant.) No dorsal pores. 
Setae minute, do, paired; aa—bc: dd estimated at slightly more than half 
circumference, so that d is just below the lateral line of the body. 
The sensory papillae, if they are such, described in the next variety (var. gravelyr) 
were scarcely visible and irregularly distributed in the first specimen examined: they 
were more regular and more marked in the second. 
Clitellum x—xiii—4, not well marked, distinguished by a rather lighter colour 
and a yellowish tinge. 
Male apertures small, in groove 10/11, outside b, but nearer 0 than c... Female 
apertures indistinct, in groove 11/12 ind. Spemmathiccal apertures minute, in groove 
7/8, just below c. 
The nephridiopores may be in line either with the ana! or the lateral setal 
bundles, but there is no regular alternation. 
Internal anatomy.—Amongst the numerous muscular sheets and strands which 
pass from the anterior portion of the alimentary canal to the parietes, those which 
represent septa are to be distinguished by their relation to the nephridia ; since the rule 
throughout the body is that the nephridia lie against the posterior face of a septum. 
The first nephridium is that of segment iv, and the sheet of tissue on the posterior face 
of which it lies will be septum 3/4. Taking the nephridia as guides, it is found that 
septa 4/5 and 5/6 are fused at their peripheral attachment, so that segment v is not 
necessarily opened in the usual procedure for displaying the interior of the worm. 
On opening the chamber representing segment v the nephridia of the segment are seen, 
as well as a section of the dorsal vessel, and a pair of small lateral vessels; the attach- 
ment ofthe conjoined septa 4/5 and 5/6 to the parietes is at the level of groove 5/6. 
Septa 6/7—8/9 are much thickened. 
The gizzards are four in number, in xv—xviii; the oesophageal wall is however 
muscular in xiv, so that an additional rudimentary gizzard might also be enumerated. 
The last heart is in ix. The hearts are not attached to the posterior septum of 
the segment, as is perhaps generally the case in the Oligochaeta, but are free in the 
cavity of the segment. 
The nephridia, attached to the posterior face of the septa, arch over the alimen- 
tary tube so as almost to meet each other in the middle line dorsal to the gut. 
