360 ALFRED GIBBS BOURNE. 
Ovisacs, one pair, developed as diverticula of Segment x1; 
provided with vascular walls and trabecule, capable of great 
extension. 
Spermathece, one pair, with muscular ducts, the terminal 
portions of which form copulatory pouches in Segment VIut. 
Nephridia paired, provided with a muscular-we'led bladder ; 
most anterior pair in Segment 111 ; anterior pairs not modified. 
Gizzard moniliform, two- to six-lobed; each lobe confined 
to one segment; lies somewhere between Segments x1 and 
06:6. 6006 
Ty phlosole absent. 
Vascular System.—No portal system, i. e. peripheral veins 
go direct to the dorsal vessel (or hearts), while the intestinal 
wall is supplied by ventro-intestinal vessels ; subneural present ; 
supra-intestinal vessel may be present or absent ; four pairs of 
hearts in Segments vi—1x.! 
M. grandis, A. G. B., 1886. 
Prostomium broad. 
Size, 590 mm. long; 36°5 mm. in circumference. 
Segments, 480, annulated. 
Pigment, very little present. 
Sete 0°5 mm. long, dorsal gap 18 mm., lateral gaps 6°95 
mm., ventral gap 5° mm. 
Nephridiopores in Segments 111 to 1x dorsal of the outer 
seta rows; elsewhere in the direction of the outer seta rows. 
Male pores nearer the inner seta rows than the outer. 
Oviducal pores in the direction of the inner seta rows. 
Spermathecopores nearer the outer seta rows than the 
inner. 
Septa v-vi to vili-1x very thick. 
Gizzard in five lobes, occupying Segments XVIII—XxXII. 
Sperm-sacs oval. 
1 [ have included in this diagnosis of the genus many characters which, no 
doubt, properly belong to the family. The family contains at present one 
other genus only, viz. Desmogaster, Rosa, 1890. 
