CHAP, VI. | DEEP-SEA DREDGING. 957 
derms, corals, and sponges, on the contrary, are 
bulky objects, and are frequently partialiy buried in 
Fie, 51.—Dredge with ‘hempen tangles.’ 
the mud or more or less firmly attached, so that the 
dredge generally misses them. With the tangles it 
S 
