568 NOTES ON AUSTRALIAN EARTHWORMS, 



and with numerous gaps, so that the setae on a segment are 

 frequently at irregular intervals, and vary slightly in number on 

 the various segments. The median dorsal region is devoid of setae, 

 and the rows of setae which bound it are irregular and sinuous. 

 The setae do not regularly alternate from segment to segment. 

 In the caudal region the rows are more numerous (about 30 in a 

 large worm), and more regular but not perfectly so, and the 

 dorsal and ventral interruptions are narrower but noticeable. 

 The segments after the first are setigerous throughout. In front 

 of the clitellum the setae are fewer per segment, less conspicuous? 

 and very irregular ; the first two ventral rows on either side 

 being the only regular ones 



Dorsal pores intersegmental, occur throughout after about the 

 1 ''>th segment. The mesenteries of segments vi to xin are very 

 thick and muscular, the first .two and the last two of these less 

 thick than the others, and are braced together by interseptal 

 ligaments. 



The muscular pharynx extends back to about in ; the large 

 gizzard the anterior portion of which is hemispherical, thin- 

 walled and crop-like apparently lies in segments v, vi, and part 

 of vn, but it is bounded posteriorly by the mesentery between 

 v and vi, which is quite thin, and which behind is pushed 

 backwards by the large gizzard ; the small intestine continues as 

 far as segment xvi, when it suddenly dilates and continues as the 

 large sacculated intestine throughout the rest of the body, and is 

 unprovided with cosca in any part of its course. The small 

 intestine is provided with no less than six pairs of pouch-like diver- 

 ticula — calciferous glands — a pair in each of segments vin to xin, 

 and of which sometimes the last three pairs are the largest ; they 

 lie just in front of the mesenteries intervening between the 

 segments containing them and the succeeding ones ; they are not 

 dorsally grooved as in Notoscolex ; in slitting open this part of 

 the intestine, the internal surface of it and of the glandular 

 pouches is red, very vascular, and provided with rugae ; the 

 apertures of the pouches are distinct; calcareous particles were not 

 noticed. 



