6 4 



is a wooden box-trap, the other a wire-net cage-like 

 cylinder. The former is a roughly made rectangular 

 case provided with a trapped tunnel-shaped opening 

 towards the lower edge of one side. Half of the cover 

 is hinged to form a lid to give ready access to the 

 interior. Bait, preferably fragments of cuttle fish, is 

 placed inside the box and the lid secured. Crabs 

 attracted by the tempting odour emanating from the 

 box, crawl up the tunnel in the side, push open a light 

 flap or door hinged at the inner end of the passage and 

 drop into the interior. 



When they try to get out they find their exit barred by 

 the trap door (see fig. 7). This trap is highly esteemed 

 for its high efficiency (PI. VI., fig. 18). 



The cage trap is almost equally good ; it consists of 

 a cylinder of wire netting with a sleeve entrance in the 

 same material at one end. An iron ring around each 

 end serves as a supporting frame (PI. VI, fig. 19). A 

 heavy weight secures the trap in position ; it is baited 

 in the usual manner. With the diminished employment 

 of ambulance cases during recent years increasing 

 attention has been given to the trapping of crabs ; 

 indeed we may say that the adoption of the system of 

 blindage in conjunction with an energetic campaign 

 against crabs has been the means of enabling parkers to 

 dispense very largely with ambulance cases, and thereby 

 effect a great economy. 



All other enemies save perhaps mussels are of 

 inferior importance and require no special protective 

 apparatus. The majority, as we have already seen, are 

 sufficiently held in check so long as the parks are 

 properly cared for and every effort made to ensure 

 cleanliness and good order. 



Mussels when very aggressive may be combated by 

 the introduction of starfishes which are particularly fond 

 of mussels. There is however always a danger that they 

 may devote their attention to the brood-oysters. The 

 best remedy is hand picking and the diligent cleaning of 

 all sticks and stakes to which the mussels adhere, just as 



