7 no ON THE CH^TOSOMATID^, 



Mode of Occurrence. 



I have not found the Chcetosomatidai anywhere in the great 

 numbers mentioned by Greef (3) and Schepotieff (7), but I have not 

 been able to make dredgings on the sea-floor at depths of 10-15 

 metres, where Schepotieff found them to be most numerous in 

 the Byfjord. My search has been confined to deptlis accessible 

 from the shore, from low water-mark to 5-6 feet below it, ob- 

 taining material from this depth by means of a long-handled net, 

 and a bucket. 



Long and careful searching has revealed a few scattered repre- 

 sentatives in most of the material collected from clumps of 

 molluscs and seaweed in different parts of Port Jackson and 

 Broken Bay, and along the ocean-shore between these two bays. 

 Round Circular Quay, they are to be found in fair numbers on 

 the growth on the jetties; but, in the very dirty water of 

 Darling Harbour, they appear to be almost entirely absent. I 

 found only one in a very large quantity of material collected 

 from an old pile, 40 feet long, which had just been pulled up, 

 this specimen coming from a depth of 16-18 feet below low- 

 water-mark. Further up Port Jackson than this, (a distance of 

 some 4^ miles from the ocean), I have not found any. In all, T 

 have secured about 100 specimens as a result of collections ex- 

 tending over six to eight months in 1916 and 1917. The 

 majority of these came from Circular Quay, Cremorne, and 

 Vaucluse, in Port Jackson; and Lion Island and Pitt Water, in 

 Broken Bay. Most of them, I have found at very shallow- 

 depths, a few actually above lowwater-mark, and all of them 

 among the growth of Algse, Sponges, Molluscs, etc., on rocks or 

 piles. They do not appear to be present where the sea-floor is 

 composed of pure sand or mud, nor in coralline zones. 

 Methods of Collecting employed 



The methods of collecting adopted varied only slightly with 

 the different species. When dealing with large quantities of 

 material, the clumps of seaweed, sponges, etc., were transferred 

 to a large bucket of sea- water, broken up, and thoroughly washed. 

 The fine mud in suspension in the water was washed off by means 

 of a siphon-funnel, the mouth of the funnel dipping into the 



