LOCOMOTION" IX SURIRHLLA. 



14: 



that tongue-like processes of .the protoplasm TFignre I, Pj, 

 each enclosing smaller processes of the chromatophors 

 (chromj, stretch up through the rib-canals (R;. He states 

 that the honeycomb or webby structure typical of protoplasm 

 is strongly marked in life in these extensions, but that such 

 structure apparently stops short at the keel ^K; ; that within 

 the hollow, tube-like keel it is scarcely possible to see any- 

 thing ; that this keel is full of an apparently hyaline sub- 

 stance, in sharpest contrast to to the contents of the ribs. In 



FiGi'RE I. (After Lauterbom). 



order to see this substance directly, it is necessary' to practice 

 very strong staining, and thionin and methyl violet were used. 

 Under this treatment there came into view a granular, con- 

 tracted filament '( eiyi k'drniger kontrahierter Strang) which was 

 usually torn loose from the fibrous plasma strands of the rib- 

 canals. The absolute unlikeness in life, and afterwards the 

 great resistance of the contents of the keel to stains that are 

 well taken by protoplasm, seem to Lauterbom to indicate that 



