'CHAP. VI.] 



DEEP-SEA DREDGING. 



257 



derms, corals, and sponges, on the contrary, are bulky 

 objects, and are frequently partially buried in the 



FIG. 51. Dredge with 'hempen tangles ' 



mud or more or less firmly attached, so that the 

 dredge generally misses them. With the tangles it 



s 



