562 NOTES ON AUSTRALIAN EARTHWORMS, 



of each segment, but not forming complete circles, these being 

 interrupted in the median ventral and dorsal lines. These 

 interruptions, of which the ventral is the more marked, are such as 

 would be caused by the absence of one or two setae from a com- 

 plete circle, that is to say they are about two or more times the 

 width of the interval between two of the setae : they are usually 

 more marked in the anterior part of the body : posteriorly the 

 dorsal interruption often appears to be rather apparent than real 

 by reason of there being no median dorsal row of setae, and it is 

 rendered more noticeable by the dorsal vessel showing through the 

 integument of the interval between the first dorsal setae on either 

 side. The number of seta? per segment varies somewhat in 

 different parts of the body, and also apparently according to the 

 size of the specimen. In front of the clitellum there are 20 setae 

 to a segment ; just behind it 28 ; and in the caudal region 32 or 

 34 : or there may be 20, 32 and 36. Two specimens from Mt. 

 Wikon gave 16, 30, and 34. The first, and the last few segments 

 not setigerous. 



Male pores two, each on a conspicuous mammillary elevation on 

 segment xvin, just in front of the line of setae of this segment, 

 corresponding with the intervaFbetween the second and third rows 

 of setae on each side ; no setae apparent on that part of the seg- 

 ment between the papillae. The pores themselves open on teat- 

 like papillae situated on basal eminences, like a mammary gland 

 with its teat : no traces of penial setae such as Beddard has 

 described in P. armata. The apertures of the oviducts are two 

 minute pores, one on each side of, and close to the median line, just 

 in front of the line of the setae. There are two pairs of speimathecal 

 apertures, between somites vn and viii, and vin and ix ; they are 

 in a line with about the sixth row of setae on each side. (In Mt. 

 Wilson specimens they almost correspond with the interval between 

 the first and second rows on each side, but are nearer to the former). 

 Dorsal pores intersegmental, present throughout after the fifth 

 segment. 



The buccal cavity leads into a muscular pharynx extending as far 

 back as the 5th somite ; the short oesophagus leads to the gizzard 



