276 DISCOVERY REPORTS 



hUernal characters. Gizzard absent. The salivary glands extend back dorsally over 

 the pharynx into segment 6, 7 or 8. Intestine commences in segment 16, typhlosole 

 absent. Lateral hearts, three pairs in segments 10-12. Nephridia with large terminal 

 vesicles. Seminal vesicles, two pairs in segments 1 1 and 12. Ovisacs present or absent, 

 occasionally present on one side only. Septal organs apparently absent. 



Prostates, two pairs opening in segments 17 and 19 respectively. The duct is confined 

 to the segment of the external opening ; near the gland it is thin and coiled once or twice, 

 near the external opening it is thicker, muscular and curved, but not coiled. The gland 

 occupies 2-4 segments behind that in which the duct lies; it is thick, tubular, and 

 irregularly twisted. Penial setal sac muscles originate from the body-wall of the segment 

 to which they belong. 



The penial setae of the a and b bundles are dissimilar. In all the adult specimens 

 examined the penial setae appear to belong to the reserve bundle, in spite of the fact that 

 the specimens were fully clitellate. All the dated collections were made in the summer 

 months from December to January (one is undated), and the absence of full-grown 

 functional setae would be explicable if this period were after or at the end of the 

 breeding season. Without further collections at other times of the year it is impossible 

 to decide on this point. In the reserve bundles the largest setae are apparently practically 

 full grown and the measurements given below refer to such setae. Setae of the b bundle 

 are from 0-45 to o-6 mm. long, about 23 ju, in diameter at the base, 17 narrowing to 14/^ 

 in the middle of the stem and about 9^ at the distal end just below where the seta begins 

 to taper rapidly. The stem is practically straight, tapering very gradually from the base 

 nearly to the distal end and then tapering rapidly to a filiform point. In a few cases the 

 distal end terminates in a rounded, more or less flattened knob (Fig. i d), apparently the 

 result of a deformity. The distal end of the stem is ornamented with a few scattered 

 single teeth (Fig. i e,f). In setae of the fl bundle the length varies from 0-43 to 0-57 mm., 

 the stem is straight except at the distal end and the diameter in the various regions is 

 about the same as in setae of the b bundle. The distal end of the a setae is spirally coiled 

 through not more than one revolution ; the direction of the spiral is the same as that of 

 the ornamentation described below, but the coiling is not very well marked. At the 

 extreme distal end the seta tapers abruptly to a filiform point as in setae of the b bundle. 

 The ornamentation (Fig. i c) commences just below the region of spiral curvature with a 

 few irregularly placed single teeth; this is succeeded by a row of three or four large 

 knobs which follow a spiral line round the stem. In setae from the right side the direc- 

 tion of the spiral is anti-clockwise, from the left side clockwise ; this is the opposite of 

 the condition in M. falclaudicus. The knobs are either smooth or serrated along the 

 edge, never markedly scalloped as in M. falclaudicus. Michaelsen, in his original 

 description, appears to have mistaken the relatively smooth setae of the b bundle for 

 reserve setae. 



Spermathecae two pairs in segments 8 and 9, similar to those of M. falclaudicus 

 and M. aquanimdidcium. The pear-shaped ampulla is not sharply separated from a 

 short, stout duct, which receives two unstalked simple diverticula near the ampulla 



