8 RECORDS OP THE AUSTRALIAN MUSEUM. 



male duct is very considerably coiled whilst the cirrus is lying at 

 rest. A characteristic feature of the large tubular cirrus is the 

 powerful armature of relatively large and very closely set and 

 spirally arranged hooks which are seen in section of the organ 

 to form a dense covering, the points projecting backwards. The 

 cirrus sac is a large powerful organ, fusiform in shape and from 

 03 to - 38 mm. long by from 018 to - 23 mm. broad, in 

 segments of 3 mm. in breadth, lying towards each anterolateral 

 corner of the segment. From it there pass inwards very distinct 

 retractor fibres which travel towards the midregion of the 

 segment. One notices that the parenchyma surrounding the sac 

 is areolate and is very definitely marked off from the rest of the 

 body-parenchyma. Within this is the true cirrus sac consisting 

 of a very powerful thick longitudinal muscle surrounding a loose 

 tissue which in turn encloses in its centre, the male duct. The 

 walls of the latter possess a definite layer of circular muscle 

 fibres. In the loose tissue there may be seen relatively large 

 muscle fibres whose course is longitudinal to the cirrus into 

 which they are inserted. They appear to act as retractors of 

 the cirrus. 



Female Glands. — The female complex consists of a compact 

 mass of glands occupying the greater part of the middle of each 

 segment, the breadth being about 07 mm. and the length 0'31 

 mm. in segments at 30 mm. distance from the anterior end. In 

 transverse section the complex, especially the ovary, is seen to 

 occupy most of the mid-region of the medulla extending longitud- 

 inally almost from the anterior to the posterior border of each 

 segment and lying between the lateral testes and the vesicula* 

 seminales in the transverse plane. 



The ovary as a whole has an approximately vermiform shape, 

 the vitelline and shell glands being located in the posteriori)' 

 directed hilum. Though there is an ovarian bridge present, yet 

 it is very short and consequently one cannot readily recognise 

 the existence of two wings. Each wing is made, up of a great 

 number of ovarian lubes arranged roughly in a radiating manner. 

 The short thick ovarian bridge lies just in front of the vitellariuru 

 and shell gland. From it there passes off postero-ventrally a 

 very short oviduct which joins the fertilizing duct very close to 

 the shell-gland complex. 



The vitelline gland, as already mentioned, lies in a midline 

 just behind and below the ovarian bridge. It is nearly 12 mm. 

 in breadth and possesses an irregular shape, being deeply lobed. 

 [ts duct is short, and passes downwards and forwards to enter 

 the fertilising canal. The shell gland complex is median and lies 



