40 Proceedings of the Royal Society of Victoria. 



(6). C. tesselatus (Figs. 16, 17, 18). Length in spirit 1 inch. 

 Colouration of the body strongly marked both when alive 

 and in spirits. The body is purphsh with the setoe on small 

 white elevations which give it a distinct chequered appear- 

 ance. A mid-dorsal line runs right forward on to the 

 prostomium. About 65 segments. The peristomium has 

 a mid-ventral cleft. 



Prostomium scarcely at all dovetailed into the peristomium. 



Clitellum distinct, tumid and occupying segments 13-17 with a 

 mid-ventral continuation including parts of segments 18 and 19 

 so far dorsal as the level of the second set* on each side. 



Setae, •! on each side, the dorsal row very irregular and may 

 be wanting in a few segments, so that occasionally there are only 

 3 on each side. The third roAv is regular to within some 6 

 segments of the posterior end. 



Male pores on small papillfe on segment IS at the level of the 

 interval between the two inner setaj on each side. 



Oviduct pores on segment 14. 



Spermathecal pores, two in number, at the level of the interval 

 between the two inner seta3 of each side, l)etween segments 7 and 

 8, 8 and 9. 



Accessory copulatory structui'es. Two pairs of small elliptical 

 patches, at the level of the interval between the two inner sette 

 of each side, betvveen segments 12 and 13, 13 and 14. 



Dorsal pores present, the first between segments 5 and 6. 



Nephridiopores not discernible. 



Alimentary canal. Gizzard in segment 5. No true calciferous 

 glands present. Large intestine commencing in segment 17. 



Circulatory system. Single dorsal vessel. Last j^air of hearts 

 in segment 12. Supra-intestinal vessel present (?). 



Excretory system. Meganephric. 



Reproductive system. Testes, two pairs, in segments 10 and 

 11, into which the ciliated rosettes open. 



Prostates, flattened, small, in segment 18. 



Sperm sacs, attaclied to the anterior wall of segment 12, 

 sacular in form. 



Ovaries in segment 13, the oviducts opening into the same 

 sejcment. 



