BY J. J. FLETCHER, M.A., B.SC, 387 



earthworm with three gizzards, (1) because, among other points of 

 difference, the latter has two pairs of male pores. For the speci- 

 mens from the Hunter River I am indebted to the kindness of the 

 Rev. K. A. Corner of Morpeth. For the opportunity of examining 

 the single specimen from the Hawkesbury I have to thank Dr. 

 Ramsay. I have had no information about the habits of these 

 worms, which were probably obtained in both cases from the rich 

 soil of the alluvial flats. (2). 



PERICHiETA EXIGUA, n. sp. 



Three specimens (from the Blue Mts.) comprising 107-115 

 segments are about 6 cm. long, and 3-3-5 mm. broad ; four others 

 (from Randwick) comprising about 120 segments are from 4 to 

 5-3 cm. long, and 2-5-3 mm. broad; two others (from Manly Beach) 

 of about the same dimensions, but both wanting the posterior 

 portion of the body. Colour when alive bright red, lighter below. 

 Prostomium nearly divides the buccal ring, the latter with a faint 

 longitudinal groove in the median ventral line. 



Clitellum of thi^ee complete segments, xiv-xvi, and slightly 

 involving xvii in the lateral and dorsal regions, thick and complete 

 all round in breeding worms so as to obscure setoe and dorsal 

 pores. 



Setse commence with 20 per segment ; this number may con- 

 tinue fairly constant, increasing a little way back to 21 or 22, or 

 in a few specimens quite in the posterior region it may increase 

 even to about 30 per segment ; there is a well-marked median ventral 

 interval throughout devoid of setse ; a dorsal interval is less well- 

 marked though perceptible anteriorly, but in the hinder region 

 of the body it is very little if any wider than the ordinary interval 

 between two setee. 



(1) Quart. Jour. Micro. Sc. No. cv, August 1886, p. 94, pi. ix, figs. 31-42. 



(2) After this paper was read the Eev. K. Corner seat me au additional 

 and larger supply of these worms, which came too late to be utilised in 

 drawing up the above description. They will however enable me to sup- 

 plement it on a future occasion, when figures of this and of several other of 

 the species referred to in this paper, will be given. 



