ANIMALS 77 



probably dig with success, using any spade or shovel, 

 but if the sand is deep he may follow the animal's 

 burrow down into the sand till he himself is completely 

 submerged, and meet with no success however long he 

 tries. Both of these groups of animals are of great 

 interest for their anatomy, and plenty of specimens 

 should be obtained if they are present. The Balano- 

 glossids should be kept in the shade in basins of sea 

 water, changed every three or four hours during the 

 daytime for twelve to twenty-four hours, until they shed 

 the sand of which their bodies are full. The members 

 of both groups may be killed and hardened in cor- 

 rosive sublimate or other preserving agent, as described 

 elsewhere ; or, failing these, may be dropped into 30 per 

 cent, spirit for one hour, 50 per cent, for the same time, 

 and then kept permanently in 70 per cent, spirit. The 

 latter for Balanoglossids should be changed at least 

 twice, as they possess in their bodies some substance 

 which in the tropical heat acts on the spirit, tending to 

 decompose it, their own bodies disintegrating at the 

 same time. 



Worms (spiny Chaetopoda and Sipunculoids) are 

 found in almost the same localities as the last groups, 

 and many should be secured while searching for 

 Balanoglossids, the mounds of some of them, par- 

 ticularly the Sipunculoids, being difficult to distinguish 

 from those of Balanoglossids. In addition we have 

 many Chaetopods which form tubes on rocks, and mem- 

 bers of both Chaetopods and Sipunculoids are among 

 the most important of boring organisms. There is no 

 royal road to success in collecting, save only hard work. 

 It is well to half fill one's boat, or send one's buckets 

 ashore, full of masses of rotten calcareous rock, of dead 

 and living corals, and of Lithothamnia. Then when 

 the rise of the tide makes further work in the sea 



