CHAPTER XV 



COLLECTING AND PRESERVING 



As regards collecting I have given a general idea of localities 

 and situations in the chapters under the different headings, 

 but after a little experience the young collector will enlarge 

 his field. 



For instance, in collecting Crustacea he will soon learn 

 that many are parasitic, or partly so ; that some Isopod 

 Crustaceans, Bopyrus, etc., live under the edges of the 

 carapace of prawns, on the gills of the lobster, the hermit 

 crab, etc., each host accommodating some particular 

 species ; that the larval forms of some picnogons live in 

 the reproductive capsules of some zoophytes ; that many 

 worms live in a kind of commensalism with sponges, form- 

 ing, as it were, a part of their mass. Many of the rarer 

 bivalve molluscs are in a way parasitic. Some live among 

 the spines of the heart urchins, on Synapta, etc. Some 

 are embedded in the leathery tests of the large ascidians. 

 Some Polyzoans are parasitic on worms on Gephyreans, 

 etc. But I think I have given a fair indication of what 

 would make a fair beginning for a typical collection. 



The equipment necessary for shore collecting is not an 

 elaborate one. The collector will require : 



A flat-bottomed basket, with a string or wire passed 

 across, on the width, to keep his jars from toppling. 



A couple of wide-mouthed jam jars, or, what is better, 

 a couple of new tins, with covers to fit inside tightly, like 

 the tins house paints are sold in. each holding about a 

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