ON A NEW SPKCIES OF APURODITA — JOHNSTON. 245 



curved ends ; the dorsal seta? lying over the dorsum have hook- 

 like extremities. 



Attached to the ventral surface of the type were a number 

 of organisms, mainly Foraminifera. They were abundant on 

 some specimens and absent on others. Mr. F. Cliapman, 

 of Melbourne, kindly determined those I sent" to him as 

 Miliolina subrotunda, Montagu, an organism characteristic of 

 shore lines and shallow water. There was also another foraminifer 

 present, the test of which resembles a Truncatxdina. At least 

 one species of this genus 6 may at times cover its test with par- 

 ticles of sand loosely cemented together. This was observed on 

 some of the worms. Mcintosh" mentions that an arenaceous 

 foraminifer lives parasitical ly on the ventral surface of A. 

 australis. Possibly the same organism is referred to, though in 

 our specimens the test is not really arenaceous, but chitinous, 

 the sand forming an extra covering. Other animal remains also 

 occurred, and may as well be mentioned here. A small siliceous 

 sponge was located between two parapodia. Entangled in the 

 felt and seta? were Foraminifera (chiefly Textularia) ; siliceous 

 and calcareous sponges ; a free living Nematode (1 Enoplida?) 

 which was too macerated for determination ; Holothurian spicules; 

 Echinoid spines ; and fragments of shells. 



6 , Chapman — Foiaminifera, 1902, p. 220. 



7 Mcintosh— Chall. Rep., Zool., xiii., 1S85, p. 36. 



